东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2011, Vol. 32 ›› Issue (3): 392-395.DOI: -

• 论著 • 上一篇    下一篇

AZ91D半固态坯料的等温压缩变形研究

曹富荣;管仁国;邢振环;   

  1. 东北大学材料与冶金学院;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50974038,51034002);;

Isothermal compression deformation of AZ91D semisolid billets

Cao, Fu-Rong (1); Guan, Ren-Guo (1); Xing, Zhen-Huan (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Guan, R.-G.
  • About author:-
  • Supported by:
    -

RichHTML

0

PDF (PC)

764

摘要： 采用自行设计的波浪型倾斜板装置制备了AZ91D半固态坯料.利用Gleeble1500热模拟实验机和光学显微镜对AZ91D半固态坯料等温压缩变形力学行为和组织演变进行了研究.结果表明:在变形温度相同的情况下,随应变速率的增加,真应力增大;随变形速率的降低,真应力减小;在应变速率相同的情况下,随变形温度的增加,真应力减小.随变形温度的降低,真应力增大.AZ91D半固态坯料等温压缩的变形机制为准弹性变形机制和热激活条件下的相界面滑动变形机制.AZ91D半固态坯料等温压缩变形的组织为球形和近球形晶粒,剪切应力作用下的α-Mg晶粒磨圆和表面张力作用下的Ostwald熟化是获得球形和近球形组织的原因.

关键词: AZ91D, 半固态, 等温压缩变形, 真应力, 真应变

Abstract: AZ91D semisolid billets were prepared by a self-designed wavelike sloping plate device. Mechanical behavior and microstructure evolution of isothermal compression deformation in AZ91D semisolid billets have been studied using a Gleeble1500 thermal simulation machine and optical microscopy. When deformation temperature was constant, true stress increased with increasing strain rate; when strain rate was constant, true stress decreased with increasing deformation temperature. The deformation mechanisms of AZ91D alloy were quasi-elastic deformation during isothermal compression and phase interface sliding under thermal activation. The microstructures of isothermal compression of AZ91D semisolid billets consist of globular and near-globular grains that are caused by the round-grinding of α-Mg grains under shear stress and Ostwald ripening under surface tension.

中图分类号: