Dynamic recrystallization behaviors of a Mg-4Y-2Nd-0.2Zn-0.5Zr alloy and the resultant mechanical properties after hot compression

被引:32
|
作者
Zhang, Zhirou [1 ]
Yang, Xuyue [1 ,2 ]
Xiao, Zhenyu [1 ]
Wang, Jun [3 ]
Zhang, Duxiu [1 ]
Liu, Chuming [1 ,2 ]
Sakai, Taku [4 ]
机构
[1] Cent S Univ, Sch Mat Sci & Engn, Educ Key Lab Nonferrous Met Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Nonferrous Met Oriented Adv Struct Mat & Mfg Coop, Changsha 410083, Hunan, Peoples R China
[3] Deakin Univ, Inst Frontier Mat, Geelong, Vic 3125, Australia
[4] Univ Electrocommun, UEC Tokyo, Chofu, Tokyo 1828585, Japan
基金
美国国家科学基金会;
关键词
Precipitation particle; Hot compression; Microstructure; Dynamic recrystallization; Microtexture; Mechanical properties; MAGNESIUM ALLOY; PRECIPITATION; TEXTURE; DEFORMATION; EVOLUTION; WE43; AZ31;
D O I
10.1016/j.matdes.2016.02.072
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The development behaviors of ultrafine grains (UFGs) due to continuous dynamic recrystallization (cDRX) were investigated in hot compression of a Mg-4Y-2Nd-0.2Zn-0.5Zr alloy pretreated in solution and subsequently peakaging. In the aging sample containing statically precipitated particles (SPPs), the occurrence of cDRX starts to take place at medium to high strains, and finally a stable size of UFGs are fully developed in a whole volume. In the as solution sample with no SPPs, by contrast, the size of UFGs evolved increases rapidly at lower strains, slowly at medium strains and then finally shows a bimodal distribution in high strain. In the latter, smaller grains accompanying with an incomplete formation of UFGs are developed by any effect of dynamically precipitated particles (DPPs). The microtexture evolved is effectively randomized in the regions of UFGs, leading to the formation of a weaker texture. The tensile elongation of the aging sample, with SPPs and fully developed UFGs, was around 17.4%. This was much higher than that of the as-solution one, with no SPPs and incompletely developed UFGs, that was 11.8%, which might result from the more randomized texture due to fully developed UFGs. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:25 / 32
页数:8
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