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Strong deformation anisotropies of omega-precipitates and strengthening mechanisms in Ti-10V-2Fe-3A1 alloy micropillars: Precipitates shearing vs precipitates disordering
Chen, W; Zhang, JY; Cao, S; Pan, Y; Huang, MD; Hu, QM; Sun, QY; Xiao, L; Sun, J; Zhang, JY (reprint author), Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.; Hu, QM (reprint author), Chinese Acad Sci, Shengyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.
2016-09-15
发表期刊ACTA MATERIALIA
ISSN1359-6454
卷号117页码:68-80
摘要Unlike the general belief that either dislocations cut or by-pass the omega-precipitates contributes to the high strength of Ti alloys, here we uncovered a new strengthening mechanism of lattice disordering of omega-precipitates by investigating the deformation behavior of body-centered-cubic (bcc) single crystalline Ti-10V-2Fe-3A1 (Ti1023) alloy micropillars. This unique omega-precipitate disordering strengthening mechanism emerges in-between the precipitate cutting and by-passing mechanisms, because the dislocations pile-up stress reaches the ideal strength of omega-phase. The w-precipitates with four variants manifest the strong deformation anisotropies, as verified by both the crystallographic orientation analysis and energy landscapes from the first principle calculations. The combination of precipitates cutting of omega l-variant and precipitates disordering of omega 2/omega 3/omega 4-variants leads to the formation of precipitate-free channel in bcc (146)(beta)-oriented Ti1023 alloy micropillars. Due to the presence of w-precipitates, the bcc Ti1023 alloy micropillars exhibit stable plastic flow, associated with weak-size dependent superior strength. These findings provide fundamental understanding of the deformation characteristic of precipitate-hardening alloys, and have important implications for the design of small-scale materials. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属[chen, wei ; zhang, jinyu ; pan, yan ; huang, mingda ; sun, qiaoyan ; xiao, lin ; sun, jun] xi an jiao tong univ, state key lab mech behav mat, xian 710049, peoples r china ; [cao, shuo ; hu, qingmiao] chinese acad sci, shengyang natl lab mat sci, inst met res, shenyang 110016, peoples r china
关键词Ti Alloy Micropillars Omega-precipitates Deformation Anisotropy Dislocations Size Effects
学科领域Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者National Natural Science Foundation of China [51301127, 51201123, 51321003]; 973 Program of China [2014CB644002, 2014CB644003]; 111 Project of China [B06025]; Natural Science Basic Research Plan in Shananxi Province of China [2014JQ6205, 2015JM5158]; Fundamental Research Funds for Central Universities of China [xjj2014126]
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/76275
专题中国科学院金属研究所
通讯作者Zhang, JY (reprint author), Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.; Hu, QM (reprint author), Chinese Acad Sci, Shengyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.
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Chen, W,Zhang, JY,Cao, S,et al. Strong deformation anisotropies of omega-precipitates and strengthening mechanisms in Ti-10V-2Fe-3A1 alloy micropillars: Precipitates shearing vs precipitates disordering[J]. ACTA MATERIALIA,2016,117:68-80.
APA Chen, W.,Zhang, JY.,Cao, S.,Pan, Y.,Huang, MD.,...&Hu, QM .(2016).Strong deformation anisotropies of omega-precipitates and strengthening mechanisms in Ti-10V-2Fe-3A1 alloy micropillars: Precipitates shearing vs precipitates disordering.ACTA MATERIALIA,117,68-80.
MLA Chen, W,et al."Strong deformation anisotropies of omega-precipitates and strengthening mechanisms in Ti-10V-2Fe-3A1 alloy micropillars: Precipitates shearing vs precipitates disordering".ACTA MATERIALIA 117(2016):68-80.
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