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Статті в журналах з теми "Microstructural effects"

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Herbster, Maria, Karsten Harnisch, Paulina Kriegel, Andreas Heyn, Manja Krüger, Christoph H. Lohmann, Jessica Bertrand, and Thorsten Halle. "Microstructural Modification of TiAl6V4 Alloy to Avoid Detrimental Effects Due to Selective In Vivo Crevice Corrosion." Materials 15, no. 16 (August 19, 2022): 5733. http://dx.doi.org/10.3390/ma15165733.

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TiAl6V4 wrought alloy is a standard material used for endoprostheses due to its ideal characteristics in terms of osseointegration. However, the insufficient wear and crevice corrosion resistance of TiAl6V4 are limiting factors that can cause clinical problems. Therefore, the objective of this study was to analyze and identify suitable phases and microstructural states of TiAl6V4 alloy with advantageous implant properties by thermal treatments. By varying the temperature and cooling rate, four heat treatment strategies were derived that produced different microstructural states that differed in morphology, arrangement and proportions of phases present. All TiAl6V4 modifications were characterized regarding their microstructure, mechanical, corrosive and tribological properties, as well as cell adhesion. The acicular, martensitic microstructure achieves a significant hardness increase by up to 63% and exhibits improved corrosion and wear resistance compared to the forged condition. Whereas the modified microstructures showed similar electrochemical properties in polarization tests using different electrolytes (PBS with H2O2 and HCl additives), selective α or β phase dissolution occurred under severe inflammatory crevice conditions after four weeks of exposure at 37 °C. The microstructurally selective corrosion processes resemble the damage patterns of retrieved Ti-based implants and provide a better understanding of clinically relevant in vivo crevice corrosion mechanisms. Furthermore, a microstructural effect on cell attachment was determined and is correlated to the size of the vanadium-rich β phase. These key findings highlight the relevance of an adapted processing of TiAl6V4 alloy to increase the longevity of implants.
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Zeng, Qiu Lian, Zhong Guang Wang, and J. K. Shang. "Microstructural Effects on Low Cycle Fatigue of Sn-3.8Ag-0.7Cu Pb-Free Solder." Key Engineering Materials 345-346 (August 2007): 239–42. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.239.

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Low cycle fatigue behavior of Sn-3.8Ag-0.7Cu solder was investigated under fully reversed cyclic loading, with particular emphasis on microstructural effects. The LCF behavior of the solder with equiaxed microstructure was found to differ greatly from that of the solder with a dendrite microstructure. At a given total strain amplitude, the dendrite microstructure exhibited a much longer fatigue life than the equiaxed microstructure. Such a strong microstructural effect on fatigue life arose from the difference in cyclic deformation and fracture mechanisms between the two microstructures. A large number of microcracks along grain boundaries of the equiaxed structure solder developed with increasing cycling, while for the dendrite structure solder, cyclic deformation took place along the direction of the maximal shear stress during fatigue tests and microcracks initiated and propagated along shear deformation bands. Besides, the fatigue behavior of the dendritic microstructure was very sensitive to cyclic frequency whereas the fatigue behavior of the equiaxed microstructure showed less sensitivity to cyclic frequency.
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Griffiths, Malcolm. "Microstructural Effects on Irradiation Creep of Reactor Core Materials." Materials 16, no. 6 (March 13, 2023): 2287. http://dx.doi.org/10.3390/ma16062287.

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The processes that control irradiation creep are dependent on the temperature and the rate of production of freely migrating point defects, affecting both the microstructure and the mechanisms of mass transport. Because of the experimental difficulties in studying irradiation creep, many different hypothetical models have been developed that either favour a dislocation slip or a mass transport mechanism. Irradiation creep mechanisms and models that are dependent on the microstructure, which are either fully or partially mechanistic in nature, are described and discussed in terms of their ability to account for the in-reactor creep behaviour of various nuclear reactor core materials. A rate theory model for creep of Zr-2.5Nb pressure tubing in CANDU reactors incorporating the as-fabricated microstructure has been developed that gives good agreement with measurements for tubes manufactured by different fabrication routes having very different microstructures. One can therefore conclude that for Zr-alloys at temperatures < 300 °C and stresses < 150 MPa, diffusional mass transport is the dominant creep mechanism. The most important microstructural parameter controlling irradiation creep for these conditions is the grain structure. Austenitic alloys follow similar microstructural dependencies as Zr-alloys, but up to higher temperature and stress ranges. The exception is that dislocation slip is dominant in austenitic alloys at temperatures < 100 °C because there are few barriers to dislocation slip at these low temperatures, which is linked to the enhanced recombination of irradiation-induced point defects.
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Agboola, Joseph, Emmanuel Anyoku, and Atinuke Oladoye. "Effects of Cooling Rate on the Microstructure, Mechanical Properties and Corrosion Resistance of 6xxx Aluminium Alloy." International Journal of Engineering Materials and Manufacture 6, no. 1 (January 30, 2021): 43–49. http://dx.doi.org/10.26776/ijemm.06.01.2021.04.

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The applicability of materials is highly dependent on its microstructure and mechanical properties. Aluminium alloy is being used extensively under diverse conditions. This study investigates the effects of cooling rate on the microstructure, mechanical properties and corrosion resistance of 6xxx-series aluminium alloy. Aluminium ingot was melted in a muffle furnace and cast into rods. The cooling rate was controlled by holding the moulds at different temperatures. Microstructural characteristics were examined by optical microscopy. Mechanical properties such as impact strength, hardness, and tensile strength were analysed using standard methods. Corrosion resistance was evaluated by potentiodynamic polarization. It was found that microstructures are dominated by ferrite and pearlite phases with different morphologies and grain sizes depending on the cooling rate. Increasing the cooling rate resulted in microstructural refinement and chemical homogeneity, improvement in mechanical properties and corrosion resistance of the 6xxx alloy.
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Akbari, G. H., H. Abbaszadeh, and H. Ghotbi Ravandi. "Effects of Al, Si and Mn on the Recrystallization Behaviors of Fe Containing 70B Brass." Materials Science Forum 558-559 (October 2007): 107–11. http://dx.doi.org/10.4028/www.scientific.net/msf.558-559.107.

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The effects of alloying elements and impurities on the microstructure and properties of metals and alloys are important. Understanding of these effects may help to control and produce products with desired properties at lower cost. In the present work the effects of Al, Si and Mn on the recrystallization behavior, hardness and microstructural changes of an Fe- containing brass during annealing were studied. The results show that alloying elements strongly affect recrystallization kinetics and resulted finer microstructures. Hardness variations during annealing are consistent with microstructural observations and the presence of alloying elements. All elements slow down recrystallization progress and increase resulted hardness values. The resulted microstructures in the presence of alloying elements are much finer than that of plain 70B brass. It was concluded that the present alloying elements affect the recrystallization behavior of 70B brass in a similar manner. Their mechanism of interactions is solute drag effect and their effects sum up when they present together.
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Zhong, Ning, Songpu Yang, Tao Liu, Yuantao Zhao, Wenge Li, Wei Li, and Xiaodong Wang. "Effects of Compositional Inhomogeneity on the Microstructures and Mechanical Properties of a Low Carbon Steel Processed by Quenching-Partitioning-Tempering Treatment." Crystals 13, no. 1 (December 23, 2022): 23. http://dx.doi.org/10.3390/cryst13010023.

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Quenching-partitioning-tempering (Q-P-T) heat treatment is a relatively novel approach to attain excellent ductility in high-strength steels. In the present work, the microstructural evolution and the mechanical properties of a low carbon microalloyed advanced steel were systematically investigated after the Q-P-T process. The microstructural evolution was explored by employing X-ray diffraction, transmission electron microscopy and scanning electron microscopy. The results indicate that the multiphase microstructures strongly depend on both the initial microstructure and the processing parameters of the quenching and partitioning process, especially the quenching temperature. Compositional inhomogeneity during the Q-P-T process results in multiphase microstructures, in which the mechanical properties of the quenching and partitioning steels may be strongly impacted by the distribution of heterogeneous austenite phase in the steel matrix.
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Regone, Wiliam, and Sérgio Tonini Button. "Effects of deformation on the microstructure of a Ti-V microalloyed steel in the phase transition region." Rem: Revista Escola de Minas 57, no. 4 (December 2004): 303–11. http://dx.doi.org/10.1590/s0370-44672004000400014.

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Microalloyed steels are used in the forging of many automotive parts like crankshafts and connecting rods. They are hot worked in a sequence of stages that includes the heating to the soaking temperature, followed by forging steps, and finally the controlled cooling to define the microstructure and mechanical properties. In this work it was investigated the thermomechanical behavior and the microstructural evolution of a Ti-V microalloyed steel in the phase transition region. Torsion tests were done with multiple steps with true strain equal to 0.26 in each step. After each torsion step the samples were continuous cooled for 15 seconds to simulate hot forging conditions. These tests provided results for the temperature at the beginning of the phase transformation, and allowed to analyze the microstructural changes. Also, workability tests were held to analyze the microstructural evolution by optical and scanning electron microscopy. Results from the torsion tests showed that the temperature for the beginning of phase transformation is about 700 ºC. Workability tests held at 700 ºC followed by water-cooling presented microstructures with different regions: strain hardened, and static and dynamic recrystallized. Workability tests at 700 ºC followed by air-cooling showed a complex microstructure with ferrite, bainite and martensite, while tests at 650 and 600 ºC followed by water-cooling showed a microstructure with allotriomorphic ferrite present in the grain boundaries of the previous austenite.
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Hu, Zhitao, Xin Wang, Yuzhou Du, Chen Liu, Zhijie Gao, Jiaze Li, and Bailing Jiang. "Effects of graphite nodule count on microstructural homogeneity of austempered ductile iron (ADI)." Metallurgical Research & Technology 120, no. 2 (2023): 217. http://dx.doi.org/10.1051/metal/2023031.

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The microstructural homogeneity of austempered ductile iron (ADI) with different graphite counts was evaluated by microstructural observations and hardness measurement. ADI was composed of spheroidal graphite, ausferrite, and stabilized austenite. Microstructural observation and microhardness evaluation indicated that graphite nodule counts affected the microstructure significantly, in a sense that the microstructure was more homogeneous for samples with higher graphite counts. More graphite nodules provided more positions for ferrite nucleation and gave rise to a fine ausferrite microstructure. However, for samples with fewer graphite nodules, the diffusion of carbon atoms in austenite far away from graphite was inhibited, which stabilized the austenite and gave rise to the existence of large-size blocky austenite. Consequently, ADI with high graphite nodule count exhibited superior ductility. This study suggested that more graphite nodule is preferred in ADI to obtain a more homogeneous microstructure.
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Yang, Hongyue, Ji Qian, Ming Yang, Chunxi Li, Hengfan Li, and Songling Wang. "Study on the Effects of Microstructural Surfaces on the Attachment of Moving Microbes." Energies 13, no. 17 (August 27, 2020): 4421. http://dx.doi.org/10.3390/en13174421.

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The research of marine antifouling is mainly conducted from the aspects of chemistry, physics, and biology. In the present work, the movement model of microorganisms along or against the flow direction on the microstructural surface was established. The model of globose algae with a diameter of 5 μm in the near-wall area was simulated by computational fluid dynamics (CFD), and the fluid kinematic characteristics and shear stress distribution over different-sized microstructures and in micropits were compared. Simulation results revealed that the increase of the β value (height to width ratio) was prone to cause vortexes in micropits. In addition, the closer the low-velocity region of the vortex center to the microstructural surface, the more easily the upper fluid of the microstructure slipped in the vortex flow and reduced the microbial attachment. Moreover, the shear stress in the micropit with a height and width of 2 μm was significantly higher than those in others; thus, microbes in this micropit easily fell off.
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Snopiński, Przemysław, Krzysztof Matus, Ondřej Hilšer, and Stanislav Rusz. "Effects of Built Direction and Deformation Temperature on the Grain Refinement of 3D Printed AlSi10Mg Alloy Processed by Equal Channel Angular Pressing (ECAP)." Materials 16, no. 12 (June 9, 2023): 4288. http://dx.doi.org/10.3390/ma16124288.

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In this work, we used an AlSi10Mg alloy produced by selective laser melting (SLM) to study the effects of build direction and deformation temperature on the grain refinement process. Two different build orientations of 0° and 90° and deformation temperatures of 150 °C and 200 °C were selected to study this effect. Light microscopy, electron backscatter diffraction and transmission electron microscopy were used to investigate the microtexture and microstructural evolution of the laser powder bed fusion (LPBF) billets. Grain boundary maps showed that the proportion of low-angle grain boundaries (LAGBs) dominated in every analysed sample. It was also found that different thermal histories caused by the change in build direction resulted in microstructures with different grain sizes. In addition, EBSD maps revealed heterogeneous microstructures comprising equiaxed fine-grained zones with ≈0.6 μm grain size and coarse-grained zones with ≈10 μm grain size. From the detailed microstructural observations, it was found that the formation of a heterogeneous microstructure is closely related to the increased fraction of melt pool borders. The results presented in this article confirm that the build direction has a significant influence on the microstructure evolution during the ECAP process.
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Дисертації з теми "Microstructural effects"

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Portsmouth, Robert Lynton. "Microstructural effects in adsorptive separations." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260591.

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Rodriguez, Maria Remedios Carmona. "Small strain effects on microstructural evolution." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392716.

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Wohlschlögel, Markus Albin. "Microstructural effects on stress in thin films." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-36733.

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Li, Ju 1975. "Modeling microstructural effects of deformation resistance and thermal conductivity." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/46283.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 2000.
Includes bibliographical references (p. 344-360).
This is a study of the microstructural influences on thermo-mechanical behavior of selected metals and ceramics using computer simulation, with original contributions in both theoretical and applied aspects. There are three major thrusts. First, by constructing a many-body empirical potential for ZrCx and then carrying out MD simulations to calculate its lattice thermal conductivity, I obtain the first quantitative evidence ever that the vibrational contribution is only a small part of the total thermal conductivity of refractory carbides at realistic carbon vacancy concentrations. This is a long-standing problem which even the most recent review article on the subject give what I now believe is the wrong estimate. Second, ideal strengths are calculated for Ar,Cu,SiC crystals using both lattice and molecular dynamics methods. A set of homogeneous instability criteria are derived. Tension tests are performed on amorphous and nanocrystalline SiC at room temperature, based on which a grain size cutoff of ~20 nm is extrapolated for the Hall-Petch effect. Nano-indentation is performed on single-crystal and nanocrystalline Cu, and bursts of dislocation loops is observed at a local stress level consistent with recent experiments on Cu thin films. Third, an invariant loop summation similar to the J-integral is derived for the driving force on defect motion, but with the loop size now down to nanometers, and the summation now expressed in terms of interatomic forces instead of stress, a field concept which is hard to use in atomistic calculations and becomes ill-defined when defect separations approach the nanometer scale. It is shown first that the change in a system's total Helmholtz free energy due to a defect's move can be approximated by a local quantity involving only scores of atoms immediately surrounding the defect. Then, perturbation expansion is used to evaluate this local invariant for defect translation using only the current configuration. This driving force measure is then tested on a) self-interstitial diffusion near free surface in [alpha]-iron, b) crack-tip extension near a void in Si, c) screw dislocation translation in Si, with convincing results down to literally r = 1 nm, at a fraction of the cost of a full relaxation or free energy calculation for the whole system. This means that defect mobility can now be characterized by a universal and invariant standard, computable from a tiny atomistic calculation without relying on elasticity formulas or image summations. The standard is then used to determine the true Peierls-Nabarro stress in Si-like materials.
by Ju Li.
Ph.D.
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Rezvanian, Omid. "GRAIN SUBDIVISION AND MICROSTRUCTURAL INTERFACIAL SCALE EFFECTS IN POLYCRYSTALLINE MATERIALS." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-01052006-204245/.

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The major objective of this research is to develop a unified physically-based representation of the microstructure in f.c.c. crystalline materials to investigate finite inelastic deformation and failure modes and scenarios at different physical scales that occur due to a myriad of factors, such as texture, grain size and shape, grain subdivision, heterogeneous microstructures, and grain boundary misorientations and distributions. The microstructurally-based formulation for inelastic deformation is based on coupling a multiple-slip crystal plasticity formulation to three distinct dislocation densities, which pertain to statistically stored dislocations (SSDs), geometrically necessary dislocations (GNDs), and grain boundary dislocations (GBDs). This dislocation density based multiple-slip crystal plasticity formulation is then coupled to specialized finite-element methods to predict the scale-dependent microstructural behavior, the evolving heterogeneous microstructure, and the localized phenomena that may contribute to failure initiation for large inelastic strains. The SSD densities provide a representation of cell-type dislocation microstructures and their related processes. The GND densities provide an understanding of the scale-dependent deformation behavior of crystalline materials as a function of grain and aggregate sizes. The GBD densities are formulated to represent the misfit dislocations that arise due to lattice misorientations across GBs, and to provide a framework to investigate the phenomena associated with the grain boundary orientations and distributions. This provides a local criterion of how GB interfaces, such as triple junctions are potential sites for failure initiation and localized behavior. The evolution of the GNDs is used to predict and understand how crystallographic and non-crystallographic microstructures relate to intragranular and intergranular deformation patterns and behavior. Furthermore, a clear understanding of how GB strength changes due to microstructural evolution is obtained as a function of microstructural heterogeneities that occur at different physical scales.
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Morgan, Terence S. "Microstructural effects of neutron irradiation on ferritic/martensitic stainless steels." Thesis, Loughborough University, 1992. https://dspace.lboro.ac.uk/2134/13768.

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A commercial grade 12%CrMo VNb ferritic/martensitic stainless steel in the form of parent plate and high-nickel off-normal weld material has been fast neutron irradiated to equivalent damage levels of 33 and 50 dpa at 400 and 465°C respectively. The microstructural and microchemical changes induced in the irradiated material, together with as-tempered and thermal control material, have been determined to high resolution by conventional transmission electron microscopy and the use of a field emission gun scanning transmission electron microscope (FEGSTEM). Equilibrium (co )segregation of chromium, molybdenum and phosphorus was detected at boundary planes in thermally aged material, with greater enrichment at the higher ageing temperature. The relative magnitudes of apparent phosphorus segregation at the two temperatures were in accordance with McLean's model governing the kinetic approach to equilibrium. The electron probe I segregant interaction was modelled in an attempt to deconvolute true segregant concentrations from derived concentration profiles: these 'deconvoluted' concentrations approximated those predicted by McLean's model. The net effects of irradiation on parent plate interfacial microchemistry were found to be to: (i) inhibit the (co )segregation of chromium, molybdenum and phosphorus, (ii) cause chromium depletion from adjacent to boundary planes, (iii) cause enrichment of silicon at prior austenite and lath boundaries during irradiation at 400°C and (iv) cause enrichment of nickel at lath boundary planes only, at both temperatures. The radiationinduced precipitates ~C and G phase, both nickel- and silicon-rich, were observed. The fully martensitic off-normal weld metal transformed to a duplex austenite!ferrite structure during irradiation at 465°C; in contrast the thermal control was at least metastable. The transformation was thought to be a martensitic reversion, facilitated by radiation-generated dislocation loops acting as nucleation sites. The austenite was heavily voided (-15 vol.%); the ferrite was relatively void-free. Depletion of the oversized solutes chromium, manganese and molybdenum and enrichment of nickel, silicon, aluminium and traces of titanium were detected at void interfaces in the austenite: little segregation could be discerned at voids in the ferrite. Overall, the results within this work and in comparison to previous studies highlight the sensitivity to initial composition, microstructure and heat treatment that the 12%Cr ferritic/martensitic steels display in their response to irradiation.
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Rohatgi, Aashish. "A microstructural investigation of shock-loading effects in FCC materials /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9944211.

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Robinson, Michelle Christina. "Microstructural and geometric effects on the piezoelectric performance of PZT MEMS." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Fall2007/m_robinson_091307.pdf.

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Booysen, Theo-Neal. "Microstructural effects on properties of additively manufactured Inconel 625 and 718." Thesis, Cape Peninsula University of Technology, 2019. http://hdl.handle.net/20.500.11838/3043.

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Thesis (MEng (Mechanical Engineering))--Cape Peninsula University of Technology, 2019
Three Dimensional(3D) printing is known as additive manufacturing: it is a method of manufacturing parts or components form sheet, wire or powder in a manufacturing process. This method differs from traditional manufacturing techniques such as casting, moulding or subtracting materials which already exist. The type of material characterization is also very important in the development and improve or manufacturing of new materials for higher strength and various application. Selective Laser Melting(SLM) an additive manufacturing powder-based process has been adopted by automotive and aerospace industries. The reason for this is that it has many potential benefits, such as 3D designs of complex components in a shortened time frame, which offers financial savings. SLM process use metallic powders with different chemical composition to manufacture complex structures, which is an innovative material processing technology. In this research SLM, a typical additive manufacture process method, was used to manufacture additively manufactured Inconel 625 and 718. These sample specimens were investigated to determine their microstructural features and mechanical properties. The microstructural features were characterized using two different experimental surface microscopy methods: scanning electron microscope(SEM) and light optical microscope (LOM). The mechanical properties were determined by studying deformation and hardness characteristics using three-point bending and hardness tests. The relationship between processing, microstructure, grain sizes and mechanical properties was established. The understanding of SLM additive manufacturing of alloys is important as well for the adoption of the technology, and the possibility of replacing commercially produced cast and wrought alloys in the near future.
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De, Jesús Aribet M. "Effects of mechanical stimulation on fibroblast-guided microstructural and compositional remodeling." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/3068.

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Many physiological and pathological processes, such as wound healing and tissue remodeling, are heavily influenced by continuous mechanical cell-cell and cell-ECM communication. Abnormalities that may compromise the biomechanical communication between the cells and the ECM can have significant repercussions on these physiological and pathological processes. The state of the mechanical environment and the reciprocal communication of mechanical signals between the ECM and the cell during wound healing and aged dermal tissue regeneration may be key in controlling the quality of the structure and physical properties of regenerated tissue. This dissertation encompasses a series of studies developed for characterizing the effects of mechanical cues on altering and controlling tissue remodeling, and regeneration in the context of controlling scar formation during wound healing, and the maintenance and regeneration of the dermal extracellular matrix (ECM) during aging. In order to achieve this goal, in vitro models that contained some features of the provisional ECM, and the ECM of the dermis were developed and subjected to an array of quantifiable mechanical cues. Wound models were studied with different mechanical boundary conditions, and found to exhibit differences in initial short-term structural remodeling that lead to significant differences in the long-term synthesis of collagen after four weeks in culture. Dermal models seeded with fibroblasts from individuals of different ages were treated with a hyaluronic acid (HA)-based dermal filler. Changes in the mechanical environment of the dermal models caused by swelling of the hydrophilc HA, resulted in changes in the expression of mechanosensitive, and ECM remodeling genes, essential for the maintenance and regeneration of dermal tissue. Taken together, these data provide new insights on the role of mechanical signals in directing tissue remodeling.
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Книги з теми "Microstructural effects"

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Cheung, Yan-Leung. Market microstructural effects in Hong Kong. Hong Kong: City Polytechnic of Hong Kong, 1994.

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2

Wu, Xinhua. Microstructural effects on fatigue crack propagation in a strength titanium aluminide. Birmingham: University of Birmingham, 1996.

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3

Deb, Prabir. Microstructural formation and effects on the performance of platinum modified aluminide coatings. Monterey, Calif: Naval Postgraduate School, 1985.

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4

A, Sanders William, and United States. National Aeronautics and Space Administration., eds. High-temperature deformation and microstructural analysis for Si₃N₄-Sc₂O₃. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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5

Harvey, Robert John. Microstructural effects of joining AL[inferior two]O[inferior three] particle reinforced 6061 alloy MMCS. Birmingham: University of Birmingham, 1999.

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Y, Onomura, and United States. National Aeronautics and Space Administration., eds. Relation between microstructural heterogeneous surface layer and nitrogen pressure during sintering in Si3N4-MgO-Al2O3 ceramics. Washington, DC: National Aeronautics and Space Administration, 1986.

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United States. National Aeronautics and Space Administration., ed. An investigation into geometry and microstructural effects upon the ultimate tensile strengths of butt welds: Final report. [Washington, DC: National Aeronautics and Space Administration, 1992.

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8

A, Noever David, and United States. National Aeronautics and Space Administration., eds. Gravitational effects on closed-cellular-foam microstructure. Washington, DC: American Institute of Aeronautics and Astronautics, Inc., 1996.

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9

Holzer, Lorenz, Philip Marmet, Mathias Fingerle, Andreas Wiegmann, Matthias Neumann, and Volker Schmidt. Tortuosity and Microstructure Effects in Porous Media. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-30477-4.

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10

Knee, N. The effects of microstructure on fatigue crack growth. Carnforth, Lancashire, England: Parthenon Press, 1986.

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Частини книг з теми "Microstructural effects"

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Lupascu, Doru C. "Agglomeration and Microstructural Effects." In Fatigue in Ferroelectric Ceramics and Related Issues, 63–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-07189-2_3.

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Koyama, Motomichi, Hiroshi Noguchi, and Kaneaki Tsuzaki. "Microstructural Crack Tip Plasticity Controlling Small Fatigue Crack Growth." In The Plaston Concept, 213–34. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7715-1_10.

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AbstractIn this chapter, we present a metallurgical–mechanical mechanism-based strategy for the design of fatigue-resistant metals. Specifically, we elucidate the importance of the metallurgical microstructure in a mechanical singular field (crack tip). The fatigue crack growth resistance is controlled through the crack tip “plasticity”, and the effect of the associated microstructure becomes significant when the crack is “small (or short)”. More importantly, the resistance to small crack growth determines a major portion of fatigue life and strength. Therefore, the microstructural crack tip plasticity is a key breakthrough to the development of fatigue-resistant metals. As successful examples of this concept, we introduce the effects of grain refinement, martensitic transformation, strain aging, dislocation planarity enhancement, and microstructure heterogeneity on small fatigue crack growths.
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Rayner, Nicole M., Mary Sanborn-Barrie, and Desmond E. Moser. "Deciphering the Effects of Zircon Deformation and Recrystallization to Resolve the Age and Heritage of an Archean Mafic Granulite Complex." In Microstructural Geochronology, 225–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119227250.ch10.

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Darab, J. G., R. Garcia, R. K. Macgrone, and K. Rajan. "Microstructural Effects in Oxide Superconductors." In Superconductivity and Applications, 441–53. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-7565-4_41.

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Fine, M. E., and J. R. Weertman. "Microstructural Effects on Creep and Fatigue." In Time-Dependent Fracture, 93–110. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5085-6_8.

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Erb, Uwe, Cedric Cheung, Mohammadreza Baghbanan, and Gino Palumbo. "Bridging Dimensional and Microstructural Scaling Effects." In The Nano-Micro Interface, 77–88. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527604111.ch7.

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Faran, Eilon, and Doron Shilo. "Microstructural Effects During Crackling Noise Phenomena." In Understanding Complex Systems, 167–98. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45612-6_9.

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Nagumo, Michihiko. "Effects of Microstructural Factors on Hydrogen Embrittlement." In Fundamentals of Hydrogen Embrittlement, 167–96. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0161-1_8.

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Nagumo, Michihiko. "Microstructural Effects in Hydrogen Embrittlement of Steel." In Fundamentals of Hydrogen Embrittlement, 205–43. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0992-6_8.

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Gillemot, Ferenc, Ákos Horváth, Márta Horváth, Attila Kovács, Bertrand Radiguet, Sebastiano Cammelli, Philippe Pareige, et al. "Microstructural Changes in Highly Irradiated 15Kh2MFA Steel." In Effects of Radiation on Nuclear Materials: 26th Volume, 45–56. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2014. http://dx.doi.org/10.1520/stp157220130098.

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Тези доповідей конференцій з теми "Microstructural effects"

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Lim, Harn Chyi, Karin Rudman, Kapil Krishnan, Robert McDonald, Pedro Peralta, Patricia Dickerson, Darrin Byler, Chris Stanek, and Kenneth J. McClellan. "Microstructural Effects on Thermal Conductivity of Uranium Oxide: A 3D Multi-Physics Simulation." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65343.

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Transport mechanisms, such as mass and heat transfer, are critical to the efficiency and the reliability of nuclear fuels such as uranium oxide. These properties can be significantly affected by the microstructure of the material. This paper looks into the effects of grain boundary (GB) Kapitza resistance on the overall heat conductivity of UO2 using a 3-D finite element model with microstructurally explicit information. The model developed is created with a 3-D reconstruction of the microstructure of depleted uranium samples performed using serial sectioning techniques with Focused Ion Beam (FIB) and Electron Backscattering Diffraction (EBSD). The model treats grain bulks, GBs and triple junctions using elements of different dimensionalities, and it is thus capable of incorporating information of all three entities in one model while keeping a manageable computational cost. Furthermore, the properties of these microstructural entities are characterized by misorientation angles and Coincident Site Lattice (CSL) models, which provide a framework to assign spatially dependent thermal and mass transfer properties based on the location and connectivity of these entities in actual microstructures. Coupling between heat transfer and mass transfer of fission products is also taken into account in the study, to make it a multi-physics model capable of following the evolution of thermal performance as fission products are produced. These simulations can provide input and insight into the fuel pellet behaviors at the initial stage of power generation when burnups are low.
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Chou, Y. Kevin, and Chris J. Evans. "Microstructural Effects in Precision Hard Turning." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0790.

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Abstract Precision hard turning provides an alternative to grinding in some finishing applications. Rapid tool wear, however, remains a bottleneck to the process being economically viable. This experimental study reports microstructural effects on cubic boron nitride (CBN) tool wear in finish hard turning. Results indicate that; 1) carbide sizes of the workpiece have significant effects on tool wear; 2) wear resistance monotonically increases with decreasing CBN grain size; and 3) in finish turning with low CBN content tools, the governing wear mechanism is fine scale attrition by microfracture and fatigue. A powder metallurgy M50 bar hard turned using an ultrafine CBN grain tool shows flank wear less than 45 μm VBmax after 6.2 km cutting distance; wear rate equals to 3.1 μm/km. Surface finish is better than 80 run Ra.
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Soboyejo, A. B. O., S. Shademan, V. Sinha та W. O. Soboyejo. "Statistical Modeling of Microstructural Effects on Fatigue Behavior of α/β Titanium Alloys". У ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2645.

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Abstract This paper presents the results of combined experimental and theoretical studies of the effects of colony microstructure on fatigue crack growth in Ti-6Al-4V. Colony microstructures with controlled lath widths and colony sizes are produced by controlled cooling from the β phase field. For colony microstructures with approximately 20 vol% of β phase, the fatigue crack growth rates are shown to decrease with increasing α lath and colony size. A new statistical multiparameter modeling methodology framework is proposed for the assessment of the combined effects of mechanical and microstructural random variables on the fatigue crack growth rate. Excellent statistical correlation has been observed between the theoretical model and experimental data. The implications of the results are also discussed for the estimation of fatigue life.
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Kim, Kyu Tae, Sang Gi Ko, and Jong Man Han. "Effects of Microstructural Inhomogeneity on HIC Susceptibility and HIC Evaluation Methods for Linepipe Steels for Sour Service." In 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/ipc2014-33341.

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It has been well documented that slab internal quality is one of the key factors for reduced susceptibility of hydrogen induced cracking (HIC) in line pipe steels designed for sour gas service. In addition, the creation of a homogeneous microstructure which is heavily influenced by the slab internal quality is also a critical key parameter to reduce the HIC susceptibility in higher strength line pipe steel grade X60 and above. For the application of deep sea linepipe exposed to higher external pressure environments, heavy gauge in combination with higher strength steel is essential. Homogeneity of the steel microstructure is a key to success for thicker plates used in sour service HIC applications in combination with a deep sea environment. In this paper, various microstructures were compared along with an evaluation of the effects of the various microstructures on HIC susceptibility in grades X52, X65 and X70 designed for sour service. The various microstructures compared consisted of polygonal ferrite and pearlite in the X52 and polygonal ferrite, pearlite, acicular ferrite and bainite in the X65 and X70. The effect of microstructural inhomogeneity on HIC susceptibility was comparatively lower for the X52 than that of the X65 and X70. The microstructure of grade X65 and X70 were different due to the different conditions of rolling and cooling that were applied. Grades X65/X70 had a microstructure of polygonal ferrite/pearlite with bainite islands that resulted in a high crack length ratio (CLR) value caused by different hardness regions across the microstructural matrix. A homogeneous fine acicular ferrite microstructure produced by optimizing temperature control during rolling and cooling showed no hydrogen induced cracking. In addition, this alloy/process/microstructure design resulted in improved toughness results in low temperature drop weight tear test (DWTT). This paper will describe the successful production results of plate and pipe for high strength heavier gauge line pipe steels with highly homogeneous microstructures designed for sour service by controlling chemical design and process conditions in rolling and cooling. In addition, HIC evaluation methods utilizing both a traditional NACE TM0284 method versus that of a Scan-UT method were conducted and compared. A proposal to make the NACE TM0284 testing method more reliable by using Scan-UT method will be presented.
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Chhabildas, L. C. "Incipient Spall Studies in Tantalum - Microstructural Effects." In Shock Compression of Condensed Matter - 2001: 12th APS Topical Conference. AIP, 2002. http://dx.doi.org/10.1063/1.1483582.

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Ceric, H., R. L. de Orio, W. Zisser, and S. Selberherr. "Modeling of microstructural effects on electromigration failure." In PROCEEDINGS OF THE 3RD INTERNATIONAL CONFERENCE ON MATHEMATICAL SCIENCES. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4881344.

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Song, Jenn-Ming, Zong-Yu Xie, Zong-Yu Xie, and Chih-Pin Hung. "Microstructural Effects on Electrodeposited Copper Direct Bonding." In 2019 6th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D). IEEE, 2019. http://dx.doi.org/10.23919/ltb-3d.2019.8735163.

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Le, D. T., Lixun Qi, Guangming Zhang, and Stanley J. Ng. "Microstructural Effects on the Machining Performance of Dental Ceramics." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1098.

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Abstract Constraints of mechanical, thermal, and chemical properties are making ceramics the material choice for industrial and dental applications. The quality of a machined surface of ceramics is fundamentally dependent on the response of the material to the machining process. This paper presents a combined analytical and experimental study with focus on optimizing the machining performance of dental ceramics — DICOR/MGC — with three distinguished microstructures. The study starts from analyzing the microstructural characteristics to searching for the machining conditions that provide satisfactory performance in terms of acceptable flexural strength. Evidence gained from the cutting force measurements and evaluation of fracture strength degradation indicates that the control of micro-scale fracture formed on the machined surface, with microstructural characteristics being considered, is the key factor which dominates the machining performance.
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Wu, Jing, Mohammad S. Alam, KM Rafidh Hassan, Jeffrey C. Suhling, and Pradeep Lall. "Investigation and Comparison of Aging Effects in SAC305 and Doped SAC+X Solders Exposed to Isothermal Aging." In ASME 2020 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipack2020-2695.

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Abstract Microstructural evolution occurs in lead free Sn-Ag-Cu (SAC) solder joints exposed to isothermal aging. Such changes lead to degradations in the mechanical properties and creep behavior of the solder, and can result in dramatic reductions in the board level reliability of lead-free electronic assemblies subjected to aging. In our recent research, Scanning Electron Microscopy (SEM) has been used to: (1) monitor aging induced microstructural changes occurring within fixed regions in selected lead-free solder joints, (2) create time-lapse imagery of the microstructure evolution, and (3) analyze the microstructural changes quantitatively and correlate to the observed mechanical behavior evolution. This approach has removed the limitations of many prior studies where aged and non-aged microstructures were taken from two different samples and could only be qualitatively compared. In our current study, the microstructural evolutions were observed in SAC305 (96.5Sn-3.0Ag-0.5Cu) and SAC_Q (SAC+Bi) exposed to isothermal conditions at T = 100 °C and 125 °C for several different regions from several different joints. The microstructures in several fixed regions of interest were recorded after predetermined time intervals of aging, which were 1 hour (up to 270 hours) and 250 hours (up to 7000 hours) for the long-term aging samples. The aging induced changes in microstructure have been correlated with the changes in mechanical behavior measured using uniaxial tensile testing. The area and diameter of each IMC particle were tracked during the aging process using the recorded images and imaging processing software. As expected, the analysis of the evolving SAC305 and SAC+X microstructures showed a significant amount of diffusion of silver and bismuth in the beta-tin matrix during aging. In particular, Ag3Sn particles coalesced during aging leading to a decrease in the number of particles. Any bismuth in the SAC+X microstructure was observed to quickly go into solution, resulting in solid solution strengthening. This primary occurred within the beta-Sn dendrites, but also in the Ag3Sn intermetallic rich regions between dendrites. The presence of bismuth in was also found to slow the diffusion process that coarsens the Ag3Sn IMC particles. The combination solid solution strengthening and a lower diffusion rate for Ag lead to reduced aging effects in the SAC+Bi alloy relative to the SAC305 solder alloy. The SAC_Q alloy was found to have significantly better high temperature mechanical properties relative to SAC305 at all prior aging conditions. In particular, the initial modulus and ultimate tensile strength of SAC305 experienced large degradations during high temperature aging, whereas the same properties of SAC_Q changed only slightly. These changes in mechanical behavior correlated well with the observed increases in the average IMC particle diameter and decreases in the number of IMC particles. The microstructural and material property degradations were especially large for SAC305 during the initial 50 hours of aging.
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Salleo, Alberto, Leslie H. Jimison, Matthew M. Donovan, Michael L. Chabinyc, and Michael F. Toney. "Microstructural effects on the performance of poly(thiophene) field-effect transistors." In SPIE Optics + Photonics, edited by Zhenan Bao and David J. Gundlach. SPIE, 2006. http://dx.doi.org/10.1117/12.681171.

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Звіти організацій з теми "Microstructural effects"

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Stoller, R. E., P. M. Rice, and K. Farrell. Microstructural analysis of radiation effects. Office of Scientific and Technical Information (OSTI), October 1995. http://dx.doi.org/10.2172/223655.

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Jones, Reese, Brad Boyce, Ari Frankel, Nathan Heckman, Mohammad Khalil, Jakob Ostien, Francesco Rizzi, Kousuke Tachida, Gregory Teichert, and Jeremy Templeton. Uncertainty Quantification of Microstructural Material Variability Effects. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1814062.

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Ulrich, Timothy, Esteban Rougier, and Amanda Duque. Microstructural Effects of PETN on Detonator Performance. Office of Scientific and Technical Information (OSTI), February 2022. http://dx.doi.org/10.2172/1844117.

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Kecskes, Laszlo J. Hot Explosive Consolidation of W-Ti Alloys: Microstructural Effects. Fort Belvoir, VA: Defense Technical Information Center, November 2001. http://dx.doi.org/10.21236/ada397165.

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McMurtrey, Michael, Jill Wright, and Laura Carroll. Microstructural Effects on Creep-Fatigue Life of Alloy 709. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1484713.

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McMurtrey, Michael, Laura Carroll, and Jill Wright. Microstructural Effects on Creep-Fatigue Life of Alloy 709. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1404723.

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McMurtrey, Michael, Laura Carroll, and Jill Wright. Microstructural Effects on Creep-Fatigue Life of Alloy 709. Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1408494.

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Le, D. T., Lixun Qi, Guangming Zhang, and Stanley J. Ng. Microstructural Effects on the Machining Performance of Dental Ceramics. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada605292.

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Youngblood, G. E., R. H. Jones, and A. Hasegawa. Microstructural effects of neutron irradiation on SiC-based fibers. Office of Scientific and Technical Information (OSTI), April 1996. http://dx.doi.org/10.2172/270434.

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Lieberman, Evan, Ricardo A. Lebensohn, Edward Martin Kober, and Anthony Rollett. Microstructural Effects on Void Nucleation in Single-Phase Copper Polycrystals. Office of Scientific and Technical Information (OSTI), May 2015. http://dx.doi.org/10.2172/1183396.

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