QUASI-SUPERPLASTICITY AND DEFORMATION MECHANISM OF ULTRALIGHT β SOLID SOLUTION Mg-11Li-3Zn ALLOY

被引：3

作者：

Cao Furong ^{[1
]}

Ding Hua ^{[1
]}

Wang Zhaodong ^{[2
]}

Li Yinglong ^{[1
]}

Guan Renguo ^{[1
]}

Cui Jianzhong ^{[3
]}

机构：

[1] Northeastern Univ, Coll Mat & Met, Shenyang 110819, Peoples R China

[2] Northeastern Univ, State Key Lab Rolling & Tandem Rolling Automat, Shenyang 110819, Peoples R China

[3] Northeastern Univ, Key Lab Mat Electromagnet Proc Res, Minist Educ, Shenyang 110819, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2012年 / 48卷 / 02期

关键词：

Mg-Li-Zn alloy; quasi-superplasticity; mechanical property; microstructure; deformation mechanism; DOMINANT DIFFUSION PROCESS; WT-PERCENT-LI; MICROSTRUCTURAL EVOLUTION; DISLOCATION CREEP; TEMPERATURE CREEP; BEHAVIOR; FLOW; CAVITATION; MAP;

D O I：

10.3724/SP.J.1037.2011.00721

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

1.2 mm thickness sheets of ultralight Mg-11Li-3Zn alloy with a density of 1.43 g/cm(3) was obtained by casting and rolling, the elongation to failure is 200% at 573K with 1.67x 10(-2) s(-1) tensile rate, which indicates high strain rate quasi-superplasticity. Significant dynamic recrystallization and grain refinement occur at 573 K and 1.67x10(-2) s(-1) under which the grain size turns from initial 27 mu m into 9 mu m, the stress exponent is 4.4 and the activation energy for flow is 112.6 kJ/mol. It is considered that the deformation mechanism of Mg-11Li-3Zn alloy at 573 K and 1.67x 10(-2) s(-1) is dislocation climb controlled by lattice diffusion.

引用

页码：250 / 256

页数：7

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