Superplasticity and microstructure in Mg-Gd-Y-Zr rolled sheet

被引：54

作者：

Li, Li ^{[1
,2
]}

Zhang, Xinming ^{[1
]}

Deng, Yunlai ^{[1
]}

Tang, Changping ^{[1
]}

机构：

[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan Province, Peoples R China

[2] Hunan Inst Technol, Dept Mech Engn, Hengyang 421002, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 485卷 / 1-2期

关键词：

Mg-Gd-Y-Zr alloy; Hot rolling; Superplastic mechanism; Second phases; MAGNESIUM ALLOY; BEHAVIOR; DEFORMATION; CREEP;

D O I：

10.1016/j.jallcom.2009.06.113

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：

Superplastic behavior and microstructure of the rolled Mg-Gd-Y-Zr alloy sheet with an initial grain size of 66 mu m were investigated. For the purposes, tensile tests at various temperatures and strain rates were conducted. which revealed that the sheet exhibited a maximum elongation of 380% at 435 degrees C and 0.0005 s(-1) The high ductility was attributed to grain boundary sliding accommodated by dislocation motion assisted by lattice diffusion. It is suggested from microstructural analysis results that the second phases exhibited the significant effect of pinning grain boundaries. and that the beta phase was deformed and the strain was partly transferred from the matrix to the beta phase (C) 2009 Elsevier B.V. All rights reserved

引用

页码：295 / 299

页数：5

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