Precipitation behavior of bulk nanocrystalline GW103K alloy induced by surface mechanical attrition treatment

被引：10
|
作者：
Xia, Shuangwu [1 ]
Xu, Jiangman [1 ]
Wang, Zhijun [2 ]
Liu, Yong [1 ]
Lu, Jian [3 ,4 ]
机构：
[1] Nanchang Univ, Key Lab Near Net Forming Jiangxi Prov, Nanchang 330031, Jiangxi, Peoples R China
[2] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[3] City Univ Hong Kong, Dept Mech & Biomed Engn, Hong Kong, Hong Kong, Peoples R China
[4] City Univ Hong Kong, Shenzhen Res Inst, Ctr Adv Struct Mat, 8 Yuexing 1st Rd,Shenzhen Hitech Ind Pk, Shenzhen, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2017年 / 697卷
关键词：
Precipitation hardening; GW103K alloy; SMAT; Micro hardness; Dislocation density; INDUCED GRAIN-REFINEMENT; AGE-HARDENING RESPONSE; Y-ZR ALLOYS; AGING CHARACTERISTICS; NANOMETER-SCALE; COPPER; 250-DEGREES-C; SMAT;
D O I：
10.1016/j.jallcom.2016.12.103
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Precipitation hardening plays a significant role in improving the strength of Mg-RE (RE = rare earth) alloy due to the formation of precipitates. It is vital to control the precipitation behavior in order to optimize the mechanical properties of Mg-RE alloy. The present study explored one new way to promote the precipitation behavior of GW103K alloy by surface mechanical attrition treatment (SMAT). As compared with the conventional heat treatment, more precipitates could be formed under a shorter aging duration after SMAT, which results in finer grain size and higher micro hardness than the asextruded one. The promotion of precipitation behavior is attributed to the high dislocation density induced by SMAT, which leads to a low nucleation energy and a high nucleation rate for the formation of precipitate. (C) 2016 Elsevier B. V. All rights reserved.
引用
收藏
页码：282 / 286
页数：5
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