Rozprawy doktorskie na temat „Age hardening”
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Kent, Damon. "Age hardening of sintered Al-Cu-Mg-Si-Sn alloys /". St. Lucia, Qld, 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17893.pdf.
Pełny tekst źródłaJohnson, Lars. "Nanostructuring and Age Hardening in TiSCN, ZrAlN, and TiAlN Thin Films". Licentiate thesis, Linköpings universitet, Tunnfilmsfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56221.
Pełny tekst źródłaFrigaard, Øyvind. "A process model for friction stir welding of age hardening aluminium alloys". Doctoral thesis, Norwegian University of Science and Technology, Department of Materials Technology, 1999. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1759.
Pełny tekst źródłaEsarey, John Gilbert. "Continuous measurement by eddy current methods of age hardening in aluminum alloys". Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23592.
Pełny tekst źródłaMany materials processing operations such as age hardening heat treatments typically involve following predetermined time and temperature schedules to obtain the desired final material properties. The intelligent processing approach is to develop sensors for monitoring of material response to processing operation in real time. As an alloy age hardens its electrical resistivity changes. Hence, the process of aging can be monitored by measuring the change is resistivity relative to that of a non-age hardening material such as fully annealed aluminum. A device using two small, spiral-wound probes was designed to induce eddy currents within the pure aluminum and the aging alloy. The probes were incorporated as elements in an impedance bridge circuit. The bridge unbalance voltage decreased in value over time indicating decreasing relativity during the aging process. The monitoring concept was verified. Refinements such as improved impedance bridge circuitry and probe size/test frequency optimization are needed to unlock its full potential.
Beverini, Gianluca. "Phase transformations in binary uranium alloys". Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292647.
Pełny tekst źródłaNicol, Alison. "Aspects of copper precipitation and irradiation hardening in Fe-Cu alloys". Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325841.
Pełny tekst źródłaSkoufari-Themistou, Leda. "Impact and yield strength behaviour of age-hardening, low-carbon copper-containing steels". Thesis, City University London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319641.
Pełny tekst źródłaGuapuriche, Manuel Antonio Salazar. "Evolution of Electrical Conductivity, Hardness and Strength during Age Hardening of AA 7010". Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507650.
Pełny tekst źródłaKhalfallah, Ibrahim. "Designing Microstructure through Reverse Peritectoid Phase Transformation in Ni₃Mo Alloy". Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/78058.
Pełny tekst źródłaMaster of Science
James, Robert Bailey. "Resistivity measurement by eddy current methods for real-time monitoring of age hardening in heat treatable alloys". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA311567.
Pełny tekst źródłaPRASAD, PRASHANTH. "CHARACTERIZATION OF NEW, CAST, HIGH TEMPERATURE ALUMINUM ALLOYS FOR DIESEL ENGINE APPLICATIONS". University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148315194.
Pełny tekst źródłaPADIAL, ARMANDO G. F. "Caracterizacao microestrutural do aco maraging de grau 400 de resistencia mecanica ultra-elevada". reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10998.
Pełny tekst źródłaMade available in DSpace on 2014-10-09T13:56:09Z (GMT). No. of bitstreams: 1 07613.pdf: 5555459 bytes, checksum: 0047c9f052248797761d648268e841ba (MD5)
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Tan, Evren. "The Effect Of Hot-deformation On Mechanical Properties And Age Hardening Characteristics Of Al-mg-si Based Wrought Aluminum Alloys". Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607937/index.pdf.
Pełny tekst źródła#945
-Al matrix. Nearly 140HB hardness could be obtained with solutionizing at 530°
C and aging at 175°
C for 8 hours which was determined as the optimum treatment for obtaining peak hardness. When shaping (deformation) was concerned
strength loss was the overall outcome of any hot or cold deformation before solutionizing
which was most probably due to the destruction of the initial microstructure. Improvement in the percent elongation was the promising aspect of this application. Strength loss was increased for samples deformed at higher temperatures and higher reductions.
Marceau, Ross Kevin William. "Design in Light Alloys by Understanding the Solute Clustering Processes During the Early Stages of Age Hardening in Al-Cu-Mg Alloys". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/4008.
Pełny tekst źródłaMarceau, Ross Kevin William. "Design in Light Alloys by Understanding the Solute Clustering Processes During the Early Stages of Age Hardening in Al-Cu-Mg Alloys". University of Sydney, 2008. http://hdl.handle.net/2123/4008.
Pełny tekst źródłaThe evolution of atomistic-level nanostructure during the early stages of both standard, high-temperature T6 heat treatment, and low-temperature secondary ageing after interruption of the former (T6I4), has been investigated in rapid hardening Al-Cu-Mg alloys using a variety of microscopy and microanalytical techniques, including transmission electron microscopy (TEM), positron annihilation spectroscopy (PAS) and atom probe tomography (APT). In order to carry out this objective, quantitative data-analysis methods were developed with respect to new cluster-finding algorithms, specifically designed for use with three-dimensional APT data. Prior to this detailed characterisation work, the actual thermal impact from both heat treatment and quenching of small, lab-scale specimens was determined through correlation of both experimental results and calculations that modelled the heat transfer conditions using the lumped capacitance method. Subsequently, the maximum diffusion distance by random walk of the solute atoms was calculated for these periods, bearing significance on the propensity for these atoms to have the ability to cluster together, rather than segregate to the dislocation loops in the microstructure, which have a relatively larger interspacing distance. Age-hardening curves for the Al-1.1Cu-xMg (x = 0, 0.2, 0.5, 0.75, 1.0, 1.7 at.%) alloys at 150ºC show that the rapid hardening phenomenon (RHP) exists for Mg compositions ≥ 0.5Mg. Given that zone-like precipitate structures were unable to be detected by TEM or APT during the early stages of ageing at 150ºC, and that statistically significant dispersions of clusters were found in the APT data after ageing for 60 s, the RHP is attributed to these clustering reactions. Identification of clusters in the APT data has been achieved using the core-linkage algorithm and they have been found to be quite small, containing only a few atoms up to a couple of tens of atoms. The RHP is governed by some critical number density of both Mg clusters and Cu-Mg co-clusters of a critical size, whereas Cu clusters do not contribute significantly to the hardening mechanism. Significance testing indicates that Mg clusters are more significant at smaller clusters sizes and Cu-Mg co-clusters more important at larger cluster sizes. Hardness results also confirm the existence of rapid early hardening during secondary ageing at 65ºC in Al-1.1Cu-1.7Mg. The mechanism of secondary rapid hardening involves a combination of both secondary clustering from solute (mainly Mg atoms) residual in solution, and pre-existing amorphous primary clusters that have slower growth kinetics at the lower secondary ageing temperature. The latter occurs mainly by vacancy-assisted diffusion of Mg atoms as evidenced by the gradual increase of the Mg:Cu ratio of co-clusters. From an alloy design point of view it is important to fully understand the solute distribution in the microstructure to be able to subsequently optimise the configuration for enhanced material properties. The change in dispersion of solute atoms during ageing was determined by combining calculations of % vacancy-solute associations with detailed measurements of the dislocation loops to estimate the solute distribution within the microstructure. The implication of the balance of solute atoms segregated to the loops compared with that in the matrix is then discussed in the context of hardnening mechanisms.
Marceau, Ross K. W. "Design in light alloys by understanding solute clustering processes during the early stages of age hardening in Al-Cu-Mg alloys". Connect to full text, 2008. http://ses.library.usyd.edu.au/handle/2123/4008.
Pełny tekst źródłaTitle from title screen (viewed Jan 07, 2009). Includes two published articles co-authored with others. Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Australina Key Centre for Microscopy and Microanalysis, Electron Microscope Unit, Faculty of Science. Includes bibliographical references. Also available in print form.
Forsén, Rikard, M. P. Johansson, Magnus Odén i Naureen Ghafoor. "Effects of Ti alloying of AlCrN coatings on thermal stability and oxidation resistance". Linköpings universitet, Nanostrukturerade material, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-93255.
Pełny tekst źródłaFunding Agencies|SSF project Designed multicomponent coatings, MultiFilms||
Syed, Muhammad Bilal. "Thermal Stability of Arc Evaporated ZrCrAlN". Thesis, Linköpings universitet, Nanostrukturerade material, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-84769.
Pełny tekst źródłaMultifilms,A4:2 Growth and characterization of Multicomponent Nitrides by Magnetron Sputtering and Arc evaporation
CHEN, DONGSHENG. "酸化物分散強化フェライト鋼における鉄/クロム相分離挙動". Kyoto University, 2015. http://hdl.handle.net/2433/199548.
Pełny tekst źródłaCHEN, DONGSHENG. "Iron/Chromium Phase Decomposition Behavior in Oxide Dispersion Strengthened Ferritic Steels". Kyoto University, 2015. http://hdl.handle.net/2433/199417.
Pełny tekst źródłaHwang, Junyeon. "Characterization and Mechanical Properties of Nanoscale Precipitates in Modified Al-Si-Cu Alloys Using Transmission Electron Microscopy and 3D Atom Probe Tomography". Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3661/.
Pełny tekst źródłaKovarik, Libor. "Microstructural study and modeling of metastable phases and their effect on strenghthening [sic] in Al-Mg-Cu-Si alloying system". The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1149006665.
Pełny tekst źródłaSasaki, Cassiano Massakazu. "Desempenho operacional de um subsolador em função da estrutura, do teor de argila e de água em três latossolos". Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-15062005-150804/.
Pełny tekst źródłaThe fast technological development of the Brazilian silviculture, during the 80s decade, culminated with the soil minimum cultivation system, established in large degree from the beginning of the 90s decade. Recent surveys in expressive Brazilian forest companies, indicated that about 77% of the planted area is accomplish under the soil minimum cultivation system. The large use of the subsoiler in the minimum cultivation, the empiricism associated to the operation and the lack of information about the interaction between the moisture content and the subsoiled soil motivated the present study, which objectives were: (i) evaluate the operational performance of a subsoiler with parabolic tine as a function of the soil structure, clay and moisture content of three Latosols, (ii) evaluate the soil disturbance degree as a function of the increasing on the clay and moisture content, (iii) evaluate the length of the subsoiling effect on the soil and the relationship between the soil disturbed area and the time after the subsoiling and, (iv) settle an ideal water interval to the subsoiling, as a function of the soil disturbance and the maximum bulk density. The researchers were developed in a sandy clay loam dystrophic Red Latosol (LVd-1), a clay dystrophic Red Latosol with kaolinit (LVd-2) and a clay dystrophic Red Latosol (LVd-3). The operational performance evaluation was realized by the parameters soil disturbed volume (SDV), work depth (WD), work width (WW), average speed (AS), theoretical work capacity (TWC) and efficiency (E). The soils disturbance degree and the length of the subsoiling effects were evaluated by the soil disturbed area (SDA), which was measured three times: after the subsoiling, 12 and 24 months after the subsoiling. The ideal water interval of the subsoiling was based upon the SDA and the normal Proctors test. Most of the parameters used to the operational performance evaluation indicated that lower moisture contents improve the subsoiler performance. The soils with structure in blocks, LVd-2, and high clay content, LVd-3, presented higher SDV (when the soils were dryer) and lower E (when the soils were damper); these characteristics provoked high age-hardening of the soil particles either, decreasing the subsoiling effect faster. Almost half of the original soil disturbed area was modified in the LVd-2 and in the LVd-3 (56 and 49%, respectively). The LVd-1 was the soil that presented the lower effect to the treatments, as a function of its high stability. The LVd-1 presented better conditions to be subsoiled between the moisture contents of 0,07 and 0,13 cm3 cm-3, the LVd-3, between 0,14 and 0,27 cm3 cm-3 and, the LVd-2, presented the lower subsoiling water range, between 0,12 and 0,19 cm3 cm-3.
Tort, Morgan. "The effects of severe plastic deformation on an age hardenable Al-2.5Cu-1.5Mg alloy". Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22578.
Pełny tekst źródłaThe effects of equal channel angular pressing (ECAP), a severe plastic deformation (SPD) technique, were investigated in an age hardenable Al-2.5Cu-1.5Mg (weight percent (wt.%)) alloy precipitating in the α + S phase field. A variety of microscopy, calorimetry and analytical techniques were employed to characterize and quantify the microstructure, including transmission kikuchi diffraction (TKD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and atom probe tomography (APT). Four different initial heat-treatments were conducted to achieve four different microstructures, containing either no precipitates, Cu-Mg clusters or/and Al2CuMg intermetallics. Each specimen was subjected to ECAP at room temperature and the related effects on the microstructure and mechanical properties were analysed. Compression experiments for small strains (less than 7%) were also undertaken on the as-quenched samples to investigate the effects of compression on the formation of clusters.After quenching and compression, Cu-Mg clusters were found in the matrix and it was elucidated that the formation of clusters was triggered by pressing. The volume fraction of clusters was found to be correlated to the strain applied: the higher the strain, the higher the volume fraction.After ECAP, the microstructure was constituted of long nanocrystalline bands separated by large undeformed grains for the samples containing only clusters before deformation, while the presence of S phase, prior to ECAP, lead to microstructures constituted of both coarse and refined zones distributed homogeneously throughout the sample. Although the samples presented clearly different microstructures after ECAP, implying that different strengthening mechanisms were active, the yield strength was found to lie above 500 MPa. The yield strength of the ECAP processed samples was modelled by superposing the different strengthening mechanisms altogether and by inputting the microstructural parameters coming from characterisation in the model. It was demonstrated that a very good correlation existed between the modelled and experimental yield strength values
Balan, Alexandre. "Modélisation isotherme et anisotherme de la limite d'élasticité précipitation-dépendante de l'Inconel 718". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI003/document.
Pełny tekst źródłaThis thesis manuscript presents the results of work concerning the effects of thermal transients on the precipitation of intermetallic phases in the nickel-based superalloy Inconel 718® and the consequences of this precipitation on the mechanical properties of this alloy. This work focuses on a coupled approach capable of describing the evolution of the precipitation of the γ'' phase and its consequences on the yield strength of the Inconel 718®. The precipitation state is modeled thanks to the implementation of the equations of the classical germination and growth theory, modified to take into account the platelet geometry of the γ'' precipitates. This precipitation model is then validated by experimental data from the literature but also from transmission electron microscope observations and small angle neutron scattering tests. The size distribution of the γ'' phase thus simulated is used as the input data of a model for predicting the precipitation-dependent elasticity limit. These simulated elasticity limits are finally compared with experimental results from tensile tests. A welding model was then made to test the elastic yield prediction model for thermal transients in an industrial case
Ibrahim, Hamdy Ibrahim. "Bioresorbable Magnesium-Based Bone Fixation Hardware: Alloy Design, Post-Fabrication Heat Treatment, Coating, and Modeling". University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1503678544356525.
Pełny tekst źródłaBraik, Abdullah Mousa Darwish. "RELIABILITY AND COST ANALYSIS OF POWER DISTRIBUTION SYSTEMS SUBJECTED TO TORNADO HAZARD". Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case1543584694806575.
Pełny tekst źródłaMeyruey, Gwenaëlle. "Caractérisation et modélisation du vieillissement thermique d’un composite à base d’alliage d’Aluminium". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI092.
Pełny tekst źródłaPrecipitation-strengthened alloys as Al-Mg-Si alloys reinforced with ceramic particles are an appropriate alternative for industrial applications. The precipitation sequence in Al-Mg-Si alloys is particularly complex when Silicon is in excess with respect to the Mg2Si composition and it is expected to be modified by the presence of the ceramic reinforcement. This is why, for industrial applications, under certain use conditions, it is fundamental to be able to predict the evolution of the microstructure in the alloy and the consequences on mechanical properties. The present work is devoted to the study of an age-hardenable Al-Mg-Si aluminium alloy which, can be facing temperatures between 100°C and 350°C in use conditions. This material is characterized by a complex precipitation sequence due to Silicon-excess and ceramic particles. The main objectives of the work are the following: 1) To describe how the microstructure evolves in the Al-Mg-Si alloy with silicon excess studied, with or without reinforcement, during a long storage period at a temperature between 100°C and 350°C. Then, it appeared necessary to describe the evolution of the mechanical properties in the same conditions but starting from a T6 state (corresponding to peak aged conditions). 2) To predict these evolutions (microstructure and strength) using an appropriate model. It was highlighted that the high silicon excess in the studied alloy leads to a simultaneous precipitation of several semi-coherent phases. Their precipitation has been predicted thanks to a KWN-type model based on classical nucleation-growth theories, validated by the experiments, and implemented considering: 1) the competitive precipitation between coherent et semi-coherent phases, 2) the rod-shape morphology of precipitates with a variable aspect ratio. This model has been used for the prediction of the Time-Temperature-Transformation diagram of the alloys and its composite considering the acceleration of the precipitation kinetics observed and attributed to the high dislocation density resulting from the presence of ceramic particles. Finally, 2 methods for the mechanical properties prediction have been compared: 1) a JMAK-type empirical approach 2) a physically based approach. The JMAK approach allowed us a quicker and easier prediction of the loss of hardness from the T6 state, for alloy and composite, during isothermal and non-isothermal treatment. Despite a prediction close to the experimental results, this approach cannot give us information about the physical mechanisms responsible for the observed mechanical variations. Then, a physically based approach taking into account the predictions of the precipitation model was used for the yield stress estimation during aging with a micromechanical model. This approach gave encouraging results and could be a powerful tool for the prediction of the strength during industrial use conditions
Ferris, William F., Terry R. McNelley i Stephen J. Hales. "The age hardening response of thermomechanically processed Al-Mg-Li alloys". Thesis, 1987. http://hdl.handle.net/10945/22597.
Pełny tekst źródłaChen, Kuo-Chan, i 陳國洲. "A Study on Age-Hardening Characteristics of Squeeze Castδ- Alumina Fiber-Reinforced Al(2024) Composites". Thesis, 1993. http://ndltd.ncl.edu.tw/handle/60907141904950726752.
Pełny tekst źródła國立交通大學
材料科學(工程)研究所
81
Precipitation hardening can influence the mechanical properties of the alumina-reinforced aluminum alloy(2024) composites fabricated by squeeze casting method. Owing to the presence of alumina fibers, the aging behavior of alumina reinforced aluminum alloy is different from aluminum alloy(2024) . Therefore, the condition of heat treatment for aluminum alloy (2024) is not satisfied to alumina-reinforced aluminum alloy (2024) composites. In the present study, we performed investigitions of DSC, microhardness, and observations of TEM to realize the difference of precipitation hardening processing of the two materials. It was found that the aging hardenign response of the matrix alloy in metal matrix composites caused suppression of GP zones forming. The reason is that the fiber- matrix interface can be treated as sinks of quench-in vacancies. In addition, the precipitates of aluminum alloy(2024) are GP zones and S', and that of alumina-reinfoced aluminum alloy(2024) composites is only S'. The precipitation of S' in alumima reinforced aluminum alloy(2024) composites is less than that of aluminum alloy(2024). The precipitation of S' is decreaed with increasing volume fraction of alumina fibers. Therefore, the peak hardness of the matrix of alumina- reinforced aluminum alloy (2024) composites is lower than that of aluminum alloy(2024).
Hung, Cheng-Hsin, i 洪正欣. "Effect of age hardening by using Mo and Ti in substitution for Al or by adding them in Al0.3CoCrFeNi high entropy alloy". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/29787683934682096889.
Pełny tekst źródła逢甲大學
材料科學所
97
This study discusses the effect of age hardening at 600-1000℃ by using Mo and Ti in substitution for Al or by adding them in an FCC Al0.3CoCrFeNi high entropy alloy. Six alloys represented by Al0.3CoCrFeNi, CoCrFeNiMo0.3, CoCrFeNiTi0.3, Al0.3CoCrFeNiMo0.1, Al0.3CoCrFeNiTi0.1, and Al0.3CoCr FeNiMo0.05Ti0.05 were synthesized. The Al0.3CoCrFeNi alloy reached its maximum hardness at 700℃-144 hrs aging. The strengthening is due to two precipitates of L12 and B2. The CoCrFeNiMo0.3 alloy reached its maximum hardness at 900℃-24 hrs aging in that a large quantity of rich Mo-Cr BCC harder phase (HV 543) was formed. The CoCrFeNiTi0.3 alloy reached the highest hardness (HV 500) in this study at 700℃-144 hrs aging because the maximum amount of Ni-Ti phase was precipitated. The Al0.3CoCrFeNiMo0.1 alloy reached its maximum hardness at 700℃-144 hrs aging because two different types of precipitates were formed: One was a black rod rich Ni-Al phase; the other was a white rod of Cr rich σ phase. The Al0.3CoCrFeNiTi0.1 alloy reached its maximum hardness at 700℃-144 hrs aging because both the amount of rich Ni-Al-Ti phase was increased and a great quantity of rich Ni-Ti phase with B2 structure was precipitated. The Al0.3CoCrFeNiMo0.05Ti0.05 alloy reached its maximum hardness at 700℃-144 hrs aging due to the precipitation of large amount of rich Ni-Ti phase and σ phase. The hardness of the as-cast Al0.3CoCrFeNi alloy was increased from HV 149 to HV 330 by using Ti in place of Al. Adding Ti in alloy was shown to be more effective in hardening than adding Mo. Either addition of Ti or Mo in Al0.3CoCrFeNi alloy could all raise alloy hardness, but Ti still had stronger hardening effect than Mo. It showed that adding 0.1 molar ratio of Ti in Al0.3CoCrFeNi alloy increased hardness by 83.3% at 700℃-144 hrs aging. Although the hardening effect of adding Mo was inferior to Ti, the precipitation of rich Mo-Cr phase could expand the age hardening effect up to 1000℃.