Relevant bibliographies by topics / Mechanical microstructural and fractographic characterization

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Academic literature on the topic 'Mechanical microstructural and fractographic characterization'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Mechanical microstructural and fractographic characterization"

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Ceschini, Lorella, Anders E. W. Jarfors, Alessandro Morri, Andrea Morri, Fabio Rotundo, Salem Seifeddine, and Stefania Toschi. "High Temperature Tensile Behaviour of the A354 Aluminum Alloy." Materials Science Forum 794-796 (June 2014): 443–48. http://dx.doi.org/10.4028/www.scientific.net/msf.794-796.443.

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The high temperature tensile behaviour of the A354 casting aluminum alloy was investigated also evaluating the influence of secondary dendrite arm spacing (SDAS). Cast specimens were produced through a gradient solidification equipment, obtaining two different classes of SDAS, namely 20-25 µm (fine microstructure) and 40-50 µm (coarse microstructure). After hot isostatic pressing and T6 heat treatment, the samples underwent mechanical characterization both at room and high temperature (200 °C). Results of tensile tests and hardness measurements were related to the microstructural features and fractographic characterization, in order to investigate the effect of microstructure and high temperature exposure on the mechanical behaviour of the alloy.
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Cvijović‐Alagić, Ivana, Vesna Maksimović, and Milan T. Jovanović. "Fractographic analysis of the aluminum matrix composite prepared by accumulative roll bonding." Metallurgical and Materials Engineering 26, no. 4 (November 12, 2020): 349–55. http://dx.doi.org/10.30544/569.

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Recent research in the material science field is focused on the easy-to-apply and cost-effective production of the structural components with enhanced mechanical properties. As an answer to these new trends in the present study, the inexpensive household aluminum foils are used to produce the multilayer aluminum matrix composite. The aluminum matrix composites are manufactured by hot-rolling of the sandwiched foils and afterward subjected to microstructural characterization and mechanical testing. Analysis of the produced composite microstructure and fracture surface obtained after tensile testing was performed using the scanning electron microscopy (SEM). The qualitative fractographic analysis revealed that the ductile fracture features prevail in the overall fracture mode of the investigated multilayer composite, while the quantitative fractographic investigation allowed more detailed insight into the composite failure process and depicted critical parameters that led to the composite failure.
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Zheng, Xiu Hua, Bilal Dogan, and Karl Heinz Bohm. "Microstructural and Mechanical Characterization of TiAl/Ti6242 Diffusion Bonds." Materials Science Forum 546-549 (May 2007): 1393–400. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.1393.

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Ti-6242 alloys have been widely used in aero-engine applications due to high temperature strength and creep resistance. The γ-TiAl based intermetallics are considered as candidate materials to replace the current materials weed at high temperatures. The present paper reports on the microstructural and mechanical characterization of γ-TiA/Ti6242 diffusion bonds. The emphasis is put on the better understanding of microstructural development during diffusion process and mechanical properties of diffusion bonds. The process variables of temperature, pressure and time were optimized to produce joints with sound microstructure and bond quality for mechanical characterization. The micro and standard tensile tests were applied to determine bonding strength of joints. Metallographic and fractographic examinations on diffusion joints and tested specimens were carried out using SEM coupled with EDX. The concentration profiles of elements from EDX analysis combined with SEM/BSE investigation demonstrated that the strong inter-diffusion of main elements Al and Ti across the bonding interface occurred during DB process leading to the formation of a noticeable diffusion zone consisting of fine* α2/α grains. The micro tensile tests showed that the preference of fracture on base materials far from the bonding line, but a more marked tendency to brittle failure along bonding interface shown by the standard tensile test results, indicating a significant sample size effect on mechanical property measurements.
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Kim, Gyeung Ho, Mehmet Sarikaya, D. L. Milius, and I. A. Aksay. "Microstructural and fractographic characterization of B4C-Al cermets tested under dynamic and static loading." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 562–63. http://dx.doi.org/10.1017/s0424820100154780.

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Cermets are designed to optimize the mechanical properties of ceramics (hard and strong component) and metals (ductile and tough component) into one system. However, the processing of such systems is a problem in obtaining fully dense composite without deleterious reaction products. In the lightweight (2.65 g/cc) B4C-Al cermet, many of the processing problems have been circumvented. It is now possible to process fully dense B4C-Al cermet with tailored microstructures and achieve unique combination of mechanical properties (fracture strength of over 600 MPa and fracture toughness of 12 MPa-m1/2). In this paper, microstructure and fractography of B4C-Al cermets, tested under dynamic and static loading conditions, are described.The cermet is prepared by infiltration of Al at 1150°C into partially sintered B4C compact under vacuum to full density. Fracture surface replicas were prepared by using cellulose acetate and thin-film carbon deposition. Samples were observed with a Philips 3000 at 100 kV.
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Ceschini, Lorella, Iuri Boromei, C. Gambaro, Giangiacomo Minak, Alessandro Morri, and Fabrizio Tarterini. "Friction Stir Welding of Aluminium Based Composites Reinforced with Al2O3 Particles." Materials Science Forum 638-642 (January 2010): 87–92. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.87.

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This paper presents the results of microstructural and mechanical characterization of Friction Stir Welding joints of two aluminum-based particles reinforced composites. The composites were FSW in the extruded and T6 heat treated condition. No post-weld heat treatment was carried out on the FSW joints. Hardness, tensile, low-cycle fatigue and impact tests were carried out. Microstructural and fractographic characterization were performed both on the base and FSW material, in order to investigate the effect of the solid-state welding process on the reinforcement particles and aluminum matrix. The FSW produced high quality joints with good microstructural characteristics: the welded zone displayed a refinement of the Al matrix grain size and reinforcement particles, and a better particle distribution. The FSW specimens showed high efficiency, both in the tensile, impact and fatigue tests.
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Agredo Diaz, Dayi Gilberto, Irma Angarita Moncaleano, and Rodolfo Rodríguez Baracaldo. "Production and characterization of dual-phase steels from an AISI 8620 steel with high Mn content." DYNA 88, no. 217 (May 10, 2021): 42–49. http://dx.doi.org/10.15446/dyna.v88n217.90451.

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Dual phase steels are materials whose microstructure is composed of a ferrite matrix with martensite islands. Ferrite provides excellent ductility, while martensite increases the strength of steel, this provides a special appeal in the automotive industry. The main objective of this research is to obtain dual phase steels from AISI 8620 steel with a high Mn content, performing heat treatments in the intercritical range to obtain martensite percentages of 27, 33, 41, and 48%, respectively. Microstructural characterization is performed using optical microscopy and scanning electron microscopy techniques, the mechanical characterization is carried out using hardness, tension and charpy impact tests. The highest mechanical resistance is achieved in steel with 41% martensite phase, while the highest ductility is given for the material with 27% martensite, a fractographic analysis of all materials allowed to determine that the type of fracture presented is ductile. When the martensite fraction increases, the impact energy exhibits a decreasing behavior, while the hardness behaves in an increasing way.
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Bharath, V., V. Auradi, and Madeva Nagaral. "Fractographic characterization of Al2O3p particulates reinforced Al2014 alloy composites subjected to tensile loading." Frattura ed Integrità Strutturale 15, no. 57 (June 22, 2021): 14–23. http://dx.doi.org/10.3221/igf-esis.57.02.

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In the current investigation, efforts are being made to produce an Al2014-Al2O3p composite with variable particle size of 88 mm by liquid stir casting route. 9, 12 and 15 weight proportions of Al2O3p were added to the Al2014 base alloy. By using SEM and EDS testing, microstructural studies have been conducted. Al2014-9, 12 and 15 weight proportion of Al2O3p composites mechanical behavior is determined in line with ASTM standards. Electron microscopic images showed that alumina (Al2O3p) particles are dispersed uniformly within the Al2014 composite matrix. EDS study confirmed the proximity of Al and O elements to composites reinforced by Al2O3p. It is also found that Al2014-Al2O3p composite hardness, UTS, and yield strength are improved by the addition of 9, 12 and 15 weight proportion of Al2O3p. Due to the addition of alumina particles in the Al2014 matrix alloy, the ductility of the produced composites decreases. Tensile fractography is performed using SEM to consider the mechanisms for failure.
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Morgado, Teresa L. M., Armando Sousa Brito, and Carlos M. Branco. "Failure Analysis of a Damaged Helicopter Rescue Hoist Cable." Materials Science Forum 730-732 (November 2012): 325–30. http://dx.doi.org/10.4028/www.scientific.net/msf.730-732.325.

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This paper presents the results and main conclusions of a study made to analyze the cause of failure occurred with an austenitic 304 class stainless steel wire rope of a helicopter rescue hoist. The cable is made up of 19 strands, 12 outside and 7 inside. As each strand contains 7 wires, the whole cable is made up of 133 wires. The study includes the chemical and microstructural characterization of the material, as well as the determination of its hardness, mechanical properties and the fractographic analysis by scanning electron microscopy (SEM). Tensile tests were performed for three velocities simulating different work conditions: 250mm/min, 50mm/min and 5mm/min. The fractographic analysis shows that the cable suffered lateral loss of material due to friction and leading to the failure of the remaining material by ductile mode.
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Tarpani, José R., Maria H. P. Braz, Waldek W. Bose Filho, and Dirceu Spinelli. "Microstructural and Fractographic Characterization of a Thermally Embrittled Nuclear Grade Steel: Part I - Annealing." Materials Research 5, no. 3 (September 2002): 357–64. http://dx.doi.org/10.1590/s1516-14392002000300022.

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Tarpani, José R., Maria H. P. Braz, Waldek W. Bose Filho, and Dirceu Spinelli. "Microstructural and Fractographic Characterization of a Thermally Embrittled Nuclear Grade Steel: Part II - Quenching and Tempering." Materials Research 5, no. 3 (September 2002): 365–71. http://dx.doi.org/10.1590/s1516-14392002000300023.

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Dissertations / Theses on the topic "Mechanical microstructural and fractographic characterization"

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Junior, Ricardo Tadeu Aureliano. "Interferência do tratamento térmico T6 em juntas soldadas a laser de compósito de liga de alumínio AA356 reforçado com partículas de carbeto de silício." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-03022016-100155/.

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Este trabalho versa sobre a caracterização de uma junta soldada em cheio (bead-onplate) de liga AA356 reforçada com partículas de SiC, soldada por um Laser de fibra de alta potência. A soldagem foi realizada em duas amostras com diferentes condições térmicas, tratadas termicamente T6 (solubilização e envelhecimento) antes da soldagem (amostra A) e após a soldagem (amostra B). Nas amostras A e B foram realizadas as análises de materialográfia via Microscopia Óptica de luz reflexiva (M.O) e Microscopia Eletrônica de Varredura (MEV), também foram realizadas análises microquímica por Energia Dispersiva de Raios-X (EDX), ensaio mecânico de microdureza e difração de Raios-X. Os corpos de prova submetidos ao ensaio de tenacidade em Flexão três pontos tinham condições térmicas iguais a da amostra A, pois essa condição térmica é a condição que normalmente o Compósito de Matriz Metálica (CMM) exibe em serviço. A inspeção materialográfica por M.O identificou a interferência do tratamento térmico T6 realizado na amostra A, fazendo que fosse possível identificar a baixa proporção das partículas de Si na matriz, conforme análise se aproximava da zona fundida (ZF), e a presença de uma estrutura metaestável com a presença dendritas na ZF, aos quais foram diretamente correlacionados com os resultados da microdureza. A amostra B exibiu uma microestrutura bem homogênea em relação à amostra A, em termos de dispersão das partículas de Si e presença de dendritas na ZF. A fratográfia por MEV em modo de imageamento por elétrons secundários, permitiu analisar as superfícies de fratura do compósito em estudo (AA356+SiC), fraturado após o ensaio de tenacidade em Flexão três pontos, identificando a presença de muitos dimples que formavam uma estrutura alveolar, conhecida como uma estrutura típica de um regime dúctil. Por meio desta técnica, também foi possível detectar os principais mecanismos de tenacificação nos CMM, tais como: trincamento, descolamento ou destacamento das partículas de SiC, e o crescimento e coalescência de dimples na estrutura da matriz, os quais foram identificados e correlacionados com o desempenho mecânico dos corpos de prova analisados. A microanálise química por EDS permitiu o mapeamento dos elementos químicos presentes nas regiões do Metal Base (MB) e na Zona Termicamente Afetada (ZTA) do CMM. Por meio desta técnica, foi possível identificar a presença das partículas de Si e SiC, os elementos químicos presentes nas regiões dendriticas, os elementos fragilizantes presentes na microestrutura do CMM, tais: como Fe, Cr e Mn, e a presença de carbeto de Aluminio-Silício (Al4SiC4) presentes nas ZF, em forma de agulhas. A microanálise química foi realizada tanto nas regiões das juntas soldadas quanto nas superfícies de fraturas provenientes do ensaio de tenacidade em Flexão três pontos.
This work focuses on the characterization of a joint welded bead-on-plate of SiC particulate-reinforced A356-alloy welded by high power fiber laser. The welding was achieved in two samples with different conditions, both with T6 applied, before (sample A) and after (sample B) the welding process respectively. Samples A and B were performed materialographic analysis by Optic Microscopy of light reflected (O.M) and scanning electron microscopy (SEM), were also performed chemical microanalysis by energy dispersive X-ray , mechanical testing microhardness and X-ray diffraction. Specimens submitted to the three point bending toughness test present a thermal condition similar to sample A, because this thermal condition is the condition that normally the Metal Matrix Composite (MMC) exhibits in service. The inspection metallographic by (O.M) identified heat treatment T6 interference in the sample A, and though this is it was possible to identify low proportion of Si particles in the matrix, while the analysis was approaching fused zone, and the presence of a metastable structure with formation of dendrites in the fused zone, were which promptly correlated with results of microhardness. The sample B exhibited more homogenous a microstructure in terms of dispersion of Si particles. SEM fractography in secondary electron imaging mode allowed to analyze fracture surface of MMC, identifying the presence of more microvoids creating an alveolar structure typical of an ductile regime. Through this technique, it also was possible to detect main toughening mechanisms for MMC, such as, cracking, debonding and growth and coalescence dimples in the structure the of matrix which were identified and correlated with performance of specimens analyzed. EDS micro-chemical analysis allowed to map chemistry elements present in various regions of CMM, such as, Base Metal (BM), heat affected zone (HAZ) and Fused Zone (FZ). Through this technique, it was possible to identify and quantify the presence of Si and SiC particles, the elements present in the dendrites and presence of embrittlement elements in the microsctructure of MMC, such as, Fe,Cr and Mn and presence of needle-shapped Aluminium-Silicon carbides (Al4SiC4) in the FZ of sample A. Chemical microanalyses were performed both in regions of welded joints and in surface of fracture from the three points bending toughness test.
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Drury, William James. "Quantitative microstructural and fractographic characterization of AE-Li/FP metal matrix composite." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/19958.

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BACELLAR, RAPHAEL SIMOES. "MICROSTRUCTURAL AND MECHANICAL CHARACTERIZATION OF AGRIBUSINESS WASTES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2010. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=16445@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Compósitos reforçados por fibras lignocelulósicas e, também, materiais estruturais de origem vegetal, tal como o bambu, vêm sendo cada vez mais empregados em diversos segmentos industriais, tendo em vista a crescente necessidade da sociedade de usar materiais provenientes de recursos naturais renováveis. Assim sendo, este trabalho visa analisar resíduos da agroindústria da produção sustentável de palmito e de coco, que são os caules das palmeiras Bactris gasipaes (pupunha) e Cocos nucifera (coqueiro). O objetivo em caracterizá-los é fundamentar uma via alternativa de obtenção de madeira, considerando os seguintes aspectos: a disponibilidade, a preservação do meio ambiente, o bom desempenho do material e o baixo custo. Neste trabalho foi feita a caracterização microestrutural da pupunha por microscopia eletrônica de varredura e microscopia óptica digital. O comportamento térmico e termo-mecânico da pupunha foi avaliado por termogravimetria e por análise termo-dinâmico mecânica. Foi avaliado ainda o comportamento mecânico em flexão, compressão e cisalhamento na linha de cola de corpos de prova usinados do estipe da pupunha, bem como se avaliou por difração de raios-X a estrutura cristalina e o grau de cristalinidade do material. Além disso, foi feita a caracterização da resistência à abrasão e avaliado o efeito do envelhecimento por absorção de água e por radiação UV nas propriedades à flexão da pupunha. Também foram avaliadas a resistência à abrasão e as propriedades mecânicas à flexão e à compressão do caule do coqueiro.
Composites reinforced by lignocellulosic fibers and structural cellulosic materials, such as bamboo, have being increasingly used in many industrial fields, owing to the growing society need to use materials from renewable resources. Therefore, this study aims to analyze two agro-wastes of the cococnut and heart of palm sustainable production, which are the trunks of these palms (Bactris gasipaes and Cocos nucifera). The main objective is to establish the foundation for an alternative way of obtaining wood, considering the following aspects: availability, environmental conservation, good performance and low material cost. In this work microestrutural characterization of pupunha trunk was done by scanning electron microscopy and digital optical microscopy. The thermal and the thermo mechanical behaviors were evaluated by thermogravimetric analysis and by dynamic thermo mechanics analysis. Also rated was the material mechanical behavior in bending, compressing and shearing in the glue line. The material crystal structure and the degree of crystallinity was tested by X-ray diffraction. The resistance to abrasion was checked and the effect of aging due to water absorption and UV radiation in the bending properties of pupunha. Finally we verified the abrasion resistance and mechanical properties of bending and compressing the coconut palm.
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Lee, William Morgan. "Dynamic Microstructural Characterization of High Strength Aluminum Alloys." NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-04302008-114019/.

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The use of aluminum alloys for commercial and military applications has increased substantially due to the alloysâ low areal density, toughness, and processability. It has recently been shown that an aluminum alloy, Al 2139, with copper, magnesium, and silver can be significantly toughened and strengthened by combinations of θâ and Ω precipitates and dispersed manganese particles. What has not been quantified are how these precipitates and dispersed particles affect behavior and what the material mechanisms and microstructural characteristics are that control the behavior of Al 2139 for strain-rates that span the quasi-static to high rates of strain. Hence, in this investigation, detailed transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM), orientation imaging microscopy (OIM), and optical microscopy (OM) were used to delineate the different physical scales that range from the nano for the precipitates and dislocations to the micron for the dispersed particles, grain orientations and texture, grain-sizes, slip-bands, and grain-boundary orientations. The deformed specimens were from an Al 2139 plate that was impacted by 4340 steel fragmentation stimulating projectiles (FSPs) at impact velocities ranging from 813 to 1043 m/s. The majority of the projectiles were defeated by the Al 2139 plate, which is another indication of the alloyâs potential for damage mitigation and projectile defeat and resistance. Based on this detailed microstructural characterization, mechanisms for projectile defeat and full penetration are proposed. Deformation and damage modes include petalling on the impact face, shear cracking through the middle section of the plate due to projectile penetration, and discing due to bending stresses at a spall plane near the back of the plate. Shear cracking appears to be GB related, and the discing is dependent on the rolling direction. The extent of these modes for cross-sections where the target was penetrated was greater than that in regions where the projectile was defeated. For projectile defeat, large and elongated grains and precipitate deformation due to dislocation interaction can lead to highly ductile performance, which resists discing failure and plate penetration. Large grains significantly reduce the fraction of GBs, which then reduces the amount of GB cracking due to intense shear accumulation and spall. The elongation of the grains due to rolling also increased the dislocation densities, and subsequently the ductility of the grains, which reduced tensile failure due to the bending in the discing regions. High angle GBâs can also limit heterogeneous θâ precipitation at the GBâs, which would reduce intergranular fracture. Precipitation of Ω also increases the spall strength and decreases localized shear through its multiple cutting interactions with dislocations at the matrix interface. Dispersed particles also increase the strength of the alloy in high strain-rate applications by resisting localized shear. The results of this study are a first step in developing a tailored methodology that can be used to optimize microstructural characteristics and behavior of aluminum alloys for optimal strength and toughness.
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Rubisoff, Haley. "MICROSTRUCTURAL CHARACTERIZATION OF FRICTION STIR WELDED TI-6AL-4V." MSSTATE, 2009. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07082009-203851/.

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Friction stir welding (FSWing) is a solid state, thermo-mechanical process that utilizes a non-consumable rotating weld tool to consolidate a weld joint. In the FSW process, the weld tool is responsible for generating both the heat required to soften the material and the forces necessary to deform and consolidate the former weld seam. Thus, weld tool geometry, material selection, and process parameters are important to the quality of the weld. To study the effects of the weld tool geometry on the resulting welds, a previous study was conducted using varying degree taper, microwave-sintered tungsten carbide (WC) weld tools to FSW Ti-6Al-4V. Fully consolidated welds were down selected for this study to evaluate the resulting mechanical properties and to document the microstructure. X-ray diffraction (XRD) was used to compare the parent material texture with that in the weld nugget. The purpose of this study is to quantify the temperatures obtained during FSWing by interpreting the resulting microstructure. This information is useful in process optimization as well as weld tool material selection.
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ANDIA, JOSE LUIS MONTALVO. "API X80 HAZ PHYSICAL SIMULATION AND MICROSTRUCTURAL AND MECHANICAL CHARACTERIZATION." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2012. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21807@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
Foram utilizados dois sistemas de aço API 5L X80, Nb-Cr e Nb-Cr-Mo, para obter as diferentes regiões da ZTA pertencentes a uma soldagem multipasse. Estas regiões são denominadas de: região de grãos grosseiros inalterados (RGGI), região de grãos refinados reaquecidos supercriticamente (RGRRS), região de grãos grosseiros reaquecidos intercriticamente (RGGRI), região de grãos grosseiros reaquecidos subcriticamente (RGGRS). Estas regiões foram obtidas para dois aportes de calor (1,2 e 2,5 kJ/mm) e a RGGRI por ser considerada a região onde poderiam ser formadas zonas frágeis localizadas (ZFL) foram utilizados também aportes de calor de 3,0 e 4,0 kJ/mm. Cada uma das regiões obtidas pela simulação física foi submetida a ensaios mecânicos de impacto Charpy e dureza, assim como a análises metalográficos por microscopia ótica (MO) e microscopia eletrônica de varredura (MEV). Foi possível observar que as microestruturas pertencentes a uma ZTA simulada obtidas com o equipamento (GleebleR3800) se mostram compatíveis com aquelas pertencentes a uma soldagem real. Este resultado comprova que as velocidades de resfriamento obtidas pela simulação foram similares àquelas da soldagem real. A adição de Mo ao sistema Nb-Cr-Mo não promoveu mudanças significativas tanto a nível microestrutural, observado por MO e MEV, como em termos de propriedades mecânicas.
Two API 5L steels grade X80 of the systems Nb-Cr and Nb-Cr-Mo, were submitted to physical simulation in order to obtain different regions of the HAZ similar to those of a multipass welding, the coarse grained heat affected zone (CGHAZ), supercritically coarse grained heat affected zone (SCCGHAZ), intercritically coarse grained heat affected zone (ICCGHAZ), subcritically coarse grained heat affected zone (SCGHAZ). The welding simulation was carried out on a Gleeble R 3800 considering two thermal cycles and different heat inputs 1.2, 2.5, 3.0 and 4,0 kJ/mm, typical of a girth weld. All HAZ zones were simulated only for 1.2 and 2.5kJ/mm. Since the ICCGHAZ is the probable weak link where a local brittle zone (LBZ) can occur, this region was simulated for all heat inputs studied. All simulated regions were subjected to traditional mechanical tests such as impact Charpy-V at -40 and -60C and microhardness Hv1kg. Metallographic analysis by optical microscopy (OM) and scanning electron microscopy (SEM) and fractography were also performed. The microstructures obtained for the different regions of the HAZ, by simulation were close to those of a real welding, however, the cooling rates obtained by simulation were slower than that obtained in a real welding. The mechanical properties and microstructure of the different regions of the HAZ for the systems NbCr and NbCrMo indicate that the microstructural and mechanical behavior of the intercritical region (ICCGHAZ) was considered to be similar to a local brittle zone (LBZ) for all conditions studied.
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Wei, Yun. "Microstructural characterization and mechanical properties of super 13% Cr steel." Thesis, University of Sheffield, 2005. http://etheses.whiterose.ac.uk/12826/.

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Super 13% Cr steels are used for offshore applications and have to meet strict tensile strength, yield strength, toughness, elongation, and hardness specifications. The mechanical properties of these steels are strongly dependent on the proportions of retained austenite and martensite, and consequently small changes in heat treatment parameters result in major changes in properties. In this work, a detailed investigation of the effect of heat treatment parameters on microstructural features, hardness and tensile properties of the commercial supermartensitic 13Cr-5Ni-2Mo steels in the asreceived and re-heat treated state were undertaken. The re-heat treatment was performed by re-austenitising the samples at 950 °C for 2 h, air-cooling, and then tempering (single and double temper) in the range of 550-700 °C. The effects of tempering temperature, time, and their combination P (P = (273+T (°C) x (40 + login t (h)) x 1000'1), the Holloman-Jaffe parameter, on retained austenite volume fraction, hardness and tensile properties were investigated. Retained austenite content increased with P to a peak value at P-36.9 and then decreased due to the formation of fresh martensite. However, the second temper increased retained austenite due to the re-transformation of fresh martensite to austenite. This resulted in refined grain size and a high dislocation density. An increase in P gave a decrease in the C and Ni content in austenite on tempering while the austenite grain size increased. The combination of these two effects led to a decrease in the stability of the retained austenite with P, as shown by the increased M. For the first temper at P > 36.9, the austenite present after the second temper was more stable than after the first temper as a result of re-distribution of C and Ni from the martensite to the austenite. 0.2% proof strength and hardness were inversely related to retained austenite content with P. Both hardness and 0.2% proof strength decreased linearly with increase in retained austenite content, but elongation showed the reverse trend. However, the slope of the relationships depended on whether fresh martensite was present or not. The results have shown that retained austenite with volume fraction between 16-30 vol% and size < 208 nm gives the optimum combination of strength, ductility and hardness.
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Querin, Joseph A. "Microstructural Characterization of AA6022-T43 Aluminum Alloy Sheet During Monotonic Loading." MSSTATE, 2005. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07082005-140147/.

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Environmental issues and regulations are pushing the automotive industry to produce more efficient and environmentally friendly vehicles. To address these issues, reducing the weight of the vehicles by use of aluminum alloys is increasing. AA6022-T43 is a new sheet aluminum alloy designed specifically for automobile enclosure panels. Because this alloy is new, little data exists on its mechanical properties in the open literature. AA6022-T43 is received by the automotive industry in 1-mm thick sheet stock and subsequently stamped into the desired component. The design and manufacturing processes of the component are guided by the materials mechanical behavior. This study characterizes the mechanical and microstructural properties of uniaxially strained AA6022-T43.
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Katiyar, Pushkar. "PROCESSING, MICROSTRUCTURAL AND MECHANICAL CHARACTERIZATION OF MECHANICALLY ALLOYED Al-Al2O3 NANOCOMPOSITES." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4496.

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Aluminum-alumina nanocomposites were synthesized using mechanical alloying of blended component powders of pure constituents. This study was performed on various powder mixtures with aluminum as the matrix and alumina as the reinforcement with volume fractions of 20, 30, and 50 % and Al[subscript 2]O[subscript 3] particle sizes of 50 nm, 150 nm, and 5 [mu]m. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were used for the crystal structure and microstructural characterization of the powders at different stages of milling. Al?O? powders with 50 nm and 150 nm particle size were predominantly of [gamma]-type, while Al[subscript 2]O[subscript 3] of 5 [mu]m size was of [alpha]-type. The main goal was to achieve uniform distribution of the Al?O? ceramic particles in the Al matrix, which was achieved on milling for 24 h in a SPEX mill or 100 h in a Fritsch Pulverisette planetary ball mill. The powders were consolidated in two stages: pre-compaction at room temperature followed by vacuum hot pressing (VHP) or hot isostatic pressing (HIP) techniques to a fully dense condition. The effect of reinforcement particle size and volume fraction on the stress-strain response, elastic modulus and yield strength of the composites was investigated. Nanoindentation and compression tests were performed to characterize the composite material. Yield strength of 515 MPa, compressive strength of 685 MPa and elastic modulus of 36 GPa were obtained from compression tests. Nanoindentation results gave the yield strength of 336 MPa, maximum shear stress of 194 MPa and an elastic modulus of 42 GPa. The low elastic modulus values obtained from the above tests might be because of localized yielding possibly due to residual stresses.
M.S.
Department of Mechanical, Materials and Aerospace Engineering;
Engineering and Computer Science
Materials Science and Engineering
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Dash, Manas Ranjan. "Thermo-mechanical durability assessment and microstructural characterization of 95.5Pb2Sn2.5Ag high temperature solder." College Park, Md. : University of Maryland, 2006. http://hdl.handle.net/1903/3570.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2006.
Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Books on the topic "Mechanical microstructural and fractographic characterization"

1

Singh, Jag J. Microstructural characterization of semi-interpenetrating polymer networks by positron lifetime spectroscopy. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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Singh, Jag J. Microstructural characterization of semi-interpenetrating polymer networks by positron lifetime spectroscopy. [Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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Bansal, Narottam P. Microstructural, chemical and mechanical characterization of polymer-derived Hi-Nicalon fibers with surface coatings. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Bansal, Narottam P. Microstructural, chemical and mechanical characterization of polymer-derived Hi-Nicalon fibers with surface coatings. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Microstructural and Mechanical Characterization of Alloys. MDPI, 2021. http://dx.doi.org/10.3390/books978-3-03943-756-6.

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Mickelberry, Kenneth D. Microstructural characterization of HSLA-100 GMA-weldments. 1987.

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Potkay, Gary P. Microstructural characterization of the heat affected zone of HSLA-100 steel GMA-weldment. 1987.

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Center, Lewis Research, ed. Tensile properties and microstructural characterization of Hi-Nicalon SiC/RBSN composites. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Thompson, Jeffrey Yates. Characterization of mechanical behavior based on microstructural phenomena in Li2O.2SiO2 glass-ceramics. 1995.

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H, Pater Ruth, Eftekhari Abe, and Langley Research Center, eds. Microstructural characterization of semi-interpenetrating polymer networks by positron lifetime spectroscopy. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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Book chapters on the topic "Mechanical microstructural and fractographic characterization"

1

Gissler, W., and J. Haupt. "Microstructural Characterization of Films and Surface Layers." In Eurocourses: Mechanical and Materials Science, 313–33. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-017-0631-5_14.

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Ajmi, Basma, Mohamed Kchaou, Amilcar Ramalho, Amira Sellami, Antonio J. Gamez, and Nabil Bouzayani. "Microstructural and Mechanical Characterization of a Baby Diaper." In Lecture Notes in Mechanical Engineering, 312–19. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52071-7_43.

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Barcellona, A., L. Cannizzaro, and D. Palmeri. "Microstructural Characterization of Thermo-Mechanical Treated TRIP Steels." In Sheet Metal 2007, 71–78. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-437-5.71.

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Kumar, Chandan, and Manas Das. "Microstructural Characterization of Ti-6Al-4V Alloy Fiber Laser Weldments." In Advances in Mechanical Engineering, 475–86. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0124-1_43.

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Deshpande, Shridhar, D. Amaresh Kumar, C. T. Murali, and Shrishail Kakkeri. "Mechanical and Microstructural Characterization of Copper and Carbon Nanotubes Composites." In Lecture Notes in Mechanical Engineering, 811–25. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4739-3_71.

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Interrante, Leonard V., Kevin Moraes, Leo MacDonald, and Walter Sherwood. "Mechanical, Thermochemical, and Microstructural Characterization of AHPCS-Derived SiC." In Ceramic Transactions Series, 123–40. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118406014.ch11.

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Katsari, C. M., H. Che, D. Guye, A. Wessman, and S. Yue. "Microstructural Characterization and Mechanical Properties of Rene 65 Precipitates." In Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications, 629–41. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89480-5_41.

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Nakamura, Toshio, Cunyou Lu, and Chad S. Korach. "Mechanical Properties of Tooth Enamel: Microstructural Modeling and Characterization." In Conference Proceedings of the Society for Experimental Mechanics Series, 171–79. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0219-0_24.

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Zheng, Xiu Hua, Bilal Dogan, and Karl Heinz Bohm. "Microstructural and Mechanical Characterization of TiAl/Ti6242 Diffusion Bonds." In Materials Science Forum, 1393–400. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-432-4.1393.

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Wötting, G., B. Kanka, and G. Ziegler. "Microstructural Development, Microstructural Characterization and Relation to Mechanical Properties of Dense Silicon Nitride." In Non-Oxide Technical and Engineering Ceramics, 83–96. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-3423-8_6.

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Conference papers on the topic "Mechanical microstructural and fractographic characterization"

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Gyekenyesi, Andrew L., Sulochana Shrestha, Manigandan Kannan, Gregory Morscher, and Onome E. Scott-Emuakpor. "Characterization of an Additively Repaired Ti-6Al-4V Alloy." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91781.

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Abstract A major disadvantage regarding integrally bladed rotors (IBRs: also referred to as blisks) is the ability to repair damage. Since it is a single part, anything beyond a minor dent requires full removal and either an expensive replacement or a complicated repair. Repair approaches gaining attention include additive metal build-up techniques such as blown powder directed energy deposition (DED). As a start and to attain confidence in such repairs, the characterization of additively modified specimens is required. The work presented here involved the tensile and fatigue testing of stock, annealed Ti-6Al-4V and DED repaired specimens. Thin, dog-bone standard test coupons, consisting of half stock material and half additively manufactured (AM) material with a bond line in the center of the specimen gauge section, were mechanically characterized via tensile and fatigued tests. The behaviors of these “50/50 AM repaired” Ti-6A1-4V coupons were compared to 100% stock Ti-6A1-4V coupons. In addition, metallography and post-test fractography were performed to study the microscopic characteristics and failure initiation sites with special attention to the grain structures in the vicinity of the bond lines. The AM repaired coupons did show a slight degradation in mechanical properties compared to the stock material of this study (tensile strength and elongation as well as fatigue life), with the microstructural dissimilarities explaining the variances. Even so, the AM repaired specimen properties were acceptable and compared favorably to other published results for stock annealed Ti-6A1-4V.
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Victoria, Patricia Iglesias, Weimin Yin, Surendra K. Gupta, and Steve Constantinides. "Microstructural Characterization of Sm-Co Magnets." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37106.

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Samarium cobalt permanent magnets have been widely used for their excellent intrinsic magnetic properties such as very high Curie temperature, high anisotropy fields and most importantly excellent temperature coefficients of induction and coercivity. These materials have continuing industrial interest especially for applications operating at elevated temperatures and in the presence of high demagnetizing fields, such as particle accelerators, high frequency traveling wave tubes (TWTs), servo-motors and automotive and aerospace applications. An area of opportunity for improving performance of SmCo magnets is increasing magnet toughness — resistance to fracture. Like all other sintered rare earth magnetic materials, SmCo magnets are based on intermetallic compounds which are intrinsically brittle and can crack in the course of fabrication, machine work, and installation in the application. Increased toughness would also reduce handling sensitivity of magnetized magnets. For many years, studies on SmCo magnets have been focused on their magnetic properties, but the mechanical characteristics, strengthening and toughening mechanisms have been rarely reported. Understanding the phase and structural transformations induced in the SmCo magnets during the manufacturing process offers insight into potential modifications — chemical or processing-related. In this study, microstructural characterizations of 1:5 and 2:17 Sm-Co magnets were carried out using optical and scanning electron microscopes. In scanning electron microscopy (SEM), backscattered electron imaging and energy dispersive X-ray (EDX) microanalysis were used to investigate different phases and oxides. Finally, crystal structure of the magnets was studied using an X-ray diffractometer (XRD). The study correlates the microstructure characterization with the thermal processing history of different grades of SmCo magnets.
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DOTCHEV, PETAR, SEYED HAMID REZA SANEI, ERIC STEINMETZ, and JASON WILLIAMS. "Nanocomposites: Manufacturing, Microstructural Characterization and Mechanical Testing." In American Society for Composites 2018. Lancaster, PA: DEStech Publications, Inc., 2018. http://dx.doi.org/10.12783/asc33/26060.

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Mashali, Farzin, Ethan M. Languri, Gholamreza Mirshekari, Jim Davidson, and David Kerns. "Microstructural and Thermal Characterization of Diamond Nanofluids." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87496.

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Conventional heat transfer fluids such as water, ethylene glycol, and mineral oil, that are used widely in industry suffer from low thermal conductivity. On the other hand, diamond has shown exceptional thermal properties with a thermal conductivity higher than five times of copper and about zero electrical conductivity. To investigate the effectiveness of nanodiamond particles in traditional heat transfer fluids, we study deaggregated ultra-dispersed diamonds (UDD) using X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). Furthermore, nanodiamond nanofluids were prepared at different concentrations in deionized (DI) water as the base fluid. Particle size distribution was investigated using TEM and the average particle size have been reported around 6 nm. The thermal conductivity of nanofluids was measured at different concentrations and temperatures. The results indicate up to 15% enhancement in thermal conductivity compared with the base fluid and thermal conductivity increases with temperature and particle loading. The viscosity raise in the samples have been negligible.
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Pereira, Gualter, Waldek Wladimir Bose Filho, Gustavo Teixeira, Fernando Ferreira Fernandez, and Julian Arnaldo Avila Diaz. "MICROSTRUCTURAL AND MECHANICAL CHARACTERIZATION OF WE43 MAGNESIUM ALLOY." In 25th International Congress of Mechanical Engineering. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobem2019.cob2019-1839.

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Zeferino, Danilo, Lucas Costa Vieira, Matheus Costa, Claudinei José de Oliveira, Marcelo Câmara, Pedro Henrique Antônio Santos, Sara Silva Ferreira de Dafé, and BRUNNA DE OLIVEIRA. "Microstructural and Mechanical Characterization of Hardox 450 Steel." In 24th ABCM International Congress of Mechanical Engineering. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobem2017.cob17-2892.

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Mahajan, Heramb P., Mohamed Elbakhshwan, Bruce C. Beihoff, and Tasnim Hassan. "Mechanical and Microstructural Characterization of Diffusion Bonded 800H." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21502.

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Abstract Compact heat exchangers have high compactness and efficiency, which is achieved by joining a stack of chemically etched channeled plates through diffusion bonding. In the diffusion bonding process, compressive stress is applied on plates at elevated temperatures for a specified period. These conditions lead to atomic diffusion, which results in the joining of all plates into a monolithic block. The diffusion bonding temperatures are above recrystallization temperatures, which changes the mechanical and microstructural properties of the bonded metal. Hence, diffusion bonded material needs mechanical and microstructural property evaluation. In this study, Alloy 800H is selected to study the influence of the diffusion bonding process on mechanical and microstructure properties of base metal. A series of tensile, fatigue, creep, and creep-fatigue experiments are conducted on base metal 800H (BM 800H) and diffusion bonded 800H (DB 800H) to explore the mechanical properties. Microstructure evolution during diffusion bonding is studied and presented in the paper. The mechanical and microstructural observations indicated ductile fracture at room temperature and brittle failure with bond delamination at elevated temperatures. The microstructure evolution during diffusion bonding is studied through tensile, fatigue, creep and creep-fatigue tests, and the implied root causes for the mechanical property changes are investigated. Efforts are made to correlate the microstructure change with mechanical property change in DB 800H.
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Rohatgi, Aashish, William R. Pogue, Jared N. Baucom, and James P. Thomas. "Microstructural and Mechanical Characterization of Carbon Nanofiber Reinforced Composites." In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17038.

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Carbon nanofibers, such as single walled carbon nanotubes (SWNT), multiwalled carbon nanotubes (MWNT) and vapor-grown carbon nanofibers (VGCF or VGCNF) are routinely compounded with polymers to create thermally and electrically conductive polymer nanocomposites. Our group is interested in combining the conduction with structural functionality by reinforcing a high-performance thermotropic liquid crystal polymer (LCP) matrix with vapor-grown carbon nanofibers and single walled carbon nanotubes. High strength and stiffness can be achieved in LCPs through the alignment of molecular domains during high-shear mixing and extrusion. Further strength and stiffness enhancements are potentially possible if the carbon nanofibers could also be aligned, perhaps, with the assistance of the aligned domains of the LCP matrix. However, the geometrical structure of VGCF is quite different and the diameter is one to two orders of magnitude larger than that of SWNT. Therefore, the processing conditions and the interactions between the LCP domains and the nanofibers are expected to lead to different dispersion and alignment characteristics of VGCF and SWNT within the LCP matrix. In this work, twin-screw and Maxwell-type mixer-extruders were used to produce neat LCP filaments and LCP-nanofiber composite filaments with various concentrations of VGCF and SWNT. The dispersion and orientation of the VGCF and SWNT reinforcements were determined by X-ray diffraction and electron microscopy. The filaments were loaded in quasi-static uniaxial tension until fracture to determine the tensile modulus, strength and strain-to-failure. The mechanical properties showed a strong dependence on the filament diameter, nanofiber concentration and processing parameters. A significant increase in mechanical performance was observed with decreasing filament diameter irrespective of the carbon nanofiber concentration. Fracture surfaces examined under electron microscopy revealed hierarchical features at multiple length scales. At the macroscopic scale, a skin-core configuration was observed in the filament cross-section with the skin possessing a greater degree of LCP molecular alignment and nanofiber alignment than the core. The mechanical and electrical properties of the LCP, LCP-VGCF and LCP-SWNT nanocomposite filaments will be described and related to processing parameters, the type of carbon nanofibers (VGCF or SWNT) and the resulting composite microstructure.
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Ramzanpour, Mohammadreza, Mohammad Hosseini-Farid, Mariusz Ziejewski, and Ghodrat Karami. "Microstructural Hyperelastic Characterization of Brain White Matter in Tension." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11549.

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Abstract Axons as microstructural constituent elements of brain white matter are highly oriented in extracellular matrix (ECM) in one direction. Therefore, it is possible to model the human brain white matter as a unidirectional fibrous composite material. A micromechanical finite element model of the brain white matter is developed to indirectly measure the brain white matter constituents’ properties including axon and ECM under tensile loading. Experimental tension test on corona radiata conducted by Budday et al. 2017 [1] is used in this study and one-term Ogden hyperelastic constitutive model is applied to characterize its behavior. By the application of genetic algorithm (GA) as a black box optimization method, the Ogden hyperelastic parameters of axon and ECM minimizing the error between numerical finite element simulation and experimental results are measured. Inverse analysis is conducted on the resultant optimized parameters shows high correlation of coefficient (&gt;99%) between the numerical and experimental data which verifies the accuracy of the optimization procedure. The volume fraction of axons in porcine brain white matter is taken to be 52.7% and the stiffness ratio of axon to ECM is perceived to be 3.0. As these values are not accurately known for human brain white matter, we study the material properties of axon and ECM for different stiffness ratio and axon volume fraction values. The results of this study helps to better understand the micromechanical structure of the brain and micro-level injuries such as diffuse axonal injury.
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Conder, C. R., G. D. Smith, and J. F. Radavich. "Microstructural and Mechanical Property Characterization of Aged Inconel Alloy 625LCF." In Superalloys. TMS, 1997. http://dx.doi.org/10.7449/1997/superalloys_1997_447_458.

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Reports on the topic "Mechanical microstructural and fractographic characterization"

1

Sikka, V. K., C. R. Howell, F. Hall, and J. Valykeo. Microstructural and mechanical property characterization of ingot metallurgy ODS iron aluminide. Office of Scientific and Technical Information (OSTI), December 1997. http://dx.doi.org/10.2172/330687.

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Natesan, K., D. Renusch, B. W. Veal, and M. Grimsditch. Microstructural and mechanical characterization of alumina scales thermally developed on iron aluminide alloys. Office of Scientific and Technical Information (OSTI), November 1996. http://dx.doi.org/10.2172/437705.

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