Strong deformation anisotropies of omega-precipitates and strengthening mechanisms in Ti-10V-2Fe-3A1 alloy micropillars: Precipitates shearing vs precipitates disordering

IMR OpenIR

	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
ISSN	1359-6454
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
WOS记录号	WOS:000383005300007
引用统计	被引频次：83[WOS] [WOS记录] [WOS相关记录]
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.
推荐引用方式 GB/T 7714	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.