Superplasticity in Mg-Li-Zn alloys processed by high ratio extrusion

被引：23

作者：

Dong, Shangli ^{[1
,2
]}

Imai, Tsunemichi ^{[1
]}

Lim, Suk-Won ^{[3
]}

Kanetake, Naoyuki ^{[4
]}

Saito, Naobumi ^{[1
]}

Shigematsu, Ichinori ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Moriyama Ku, Nagoya, Aichi 4638560, Japan

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150006, Peoples R China

[3] Yeong Dong Coll, Dept Adv Mat Engn, Kangnung, South Korea

[4] Nagoya Univ, Grad Sch Engn, Nagoya, Aichi 4648601, Japan

来源：

MATERIALS AND MANUFACTURING PROCESSES | 2008年 / 23卷 / 3-4期

基金：

日本学术振兴会;

关键词：

activation energy; elongation; extrusion; fracture; grain boundary; magnesium alloys; magnesium-lithium alloy; metallographic phases; plastic flow; recrystallization; sliding; stirring casting; strain rate; superplasticity; tensile testing;

D O I：

10.1080/10426910701860954

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Superplastic behavior of Mg-8.5Li-1Zn and Mg-8.5Li-3Zn alloys has been investigated. Dynamic recrystallization occurs in the Mg-Li-Zn alloys during extruding with high ratio after stir casting. Mg-8.5Li-1Zn alloy exhibits an elongation of about 400% at the high strain rate of 1.1 x 10(-2) S-1 at 623 K, while the Mg-8.5Li-3Zn alloy shows maximum elongation of more than 540%. The apparent activation energy for superplastic flow of both Mg-8.5Li-1Zn and Mg-8.5Li-3Zn alloys at 573-673 K is about 86 kJ/mol and 79 kJ/mol, respectively, so that the dominant deformation mechanism in Mg-Li-Zn alloys is grain boundary sliding (GBS) controlled by grain boundary diffusion.

引用

页码：336 / 341

页数：6

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