Superplasticity and Deformation Mechanism Map in a Superlight Microduplex Mg-7.83Li Alloy

被引：0

作者：

Cao, Fu Rong ^{[1
]}

Ding, Hua ^{[1
]}

Hou, Hong Liang ^{[2
]}

Li, Zhi Qiang ^{[2
]}

Cui, Jian Zhong ^{[3
]}

机构：

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

[2] Beijing Aeronaut Mfg Technol Res Inst, Beijing 100024, Peoples R China

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

来源：

ELECTRICAL AND CONTROL ENGINEERING & MATERIALS SCIENCE AND MANUFACTURING | 2016年

基金：

中国国家自然科学基金;

关键词：

Superplasticity; Deformation Mechanism Map; Number of Dislocation; Dislocation Density; TEMPERATURE; EXTRUSION; BEHAVIOR;

D O I：

暂无

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

The fine-grained as-rolled Mg-7.83Li alloy demonstrated the elongations to failure ranging from 500 to 600% at temperatures of 473-623 K at an initial strain rate of 1.67x10(-3) s(-1) the sample for temperature-strain-rate-changing tension exhibited a taper appearance and induced considerable dynamic grain growth. Observation by scanning electron microscope revealed that there arc many dimples on the fracture surface and the fracture mode is intergranular fracture. The models of number of dislocations and dislocation density inside the grain and at the grain boundary were incorporated into the calculation of constitutive equations and four modified Ruano-Wadsworth-Sherby deformation mechanism maps (DMMs) were constnicted. The new DMMs gave the distribution and the variation of dislocation parameters. It was shown that grain boundary sliding accommodated by slip controlled by lattice diffusion is the dominant superplastic mechanism of the present alloy at 573 K.

引用

页码：437 / 446

页数：10

共 18 条

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