超轻&beta;固溶体Mg-11Li-3Zn合金的准超塑性与变形机理

曹富荣; 丁桦; 王昭东; 李英龙; 管仁国; 崔建忠

doi:10.3724/SP.J.1037.2011.00721

金属学报 >

2012 , Vol. 48 >Issue 2: 250 - 256

DOI: https://doi.org/10.3724/SP.J.1037.2011.00721

论文

超轻β固溶体Mg-11Li-3Zn合金的准超塑性与变形机理

曹富荣 ,
丁桦 ,
王昭东 ,
李英龙 ,
管仁国 ,
崔建忠

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1. 东北大学材料与冶金学院, 沈阳 110819
2. 东北大学轧制与连轧自动化国家重点实验室, 沈阳 110819
3. 东北大学材料电磁过程研究教育部重点实验室, 沈阳 110819

曹富荣, 男, 1964年生, 副教授, 博士

收稿日期: 2011-11-18

修回日期: 2012-02-19

网络出版日期: 2012-02-11

基金资助

国家自然科学基金项目50974038和51034002资助

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

CAO Fu-Rong ,
DING Hua ,
YU Zhao-Dong ,
LI Yang-Long ,
GUAN Ren-Guo ,
CUI Jian-Zhong

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1. College of Materials and Metallurgy, Northeastern University, Shenyang 110819
2. State Key Lab of Rolling and Tandem Rolling Automation, Northeastern University, Shenyang 110819
3. Key Lab of Materials Electromagnetic Process Research, Ministry of Education, Northeastern University, Shenyang 110819

Received date: 2011-11-18

Revised date: 2012-02-19

Online published: 2012-02-11

Supported by

Supported by National Natural Science Foundation of China (Nos.50974038 and 51034002)

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摘要

采用铸造和轧制的方法获得了1.2 mm厚密度为1.43 g/cm³的超轻Mg-11Li-3Zn合金板材, 在573 K和1.67×10² s^-1条件下拉伸获得了200%的延伸率,其在高应变速率下呈现准超塑性; 在拉伸过程中试样发生显著的动态再结晶导致晶粒细化,晶粒尺寸由平均27 μm减小到9 μm; 此条件下的应力指数为4.4, 流动激活能112.6 kJ/mol. 分析表明,573 K和1.67×10^-2 s^-1条件下试样拉伸过程中的变形机理为晶格扩散控制的位错攀移.

关键词： Mg-Li-Zn合金; 准超塑性; 力学性能; 显微组织; 变形机理

本文引用格式

曹富荣 , 丁桦 , 王昭东 , 李英龙 , 管仁国 , 崔建忠 . 超轻β固溶体Mg-11Li-3Zn合金的准超塑性与变形机理[J]. 金属学报, 2012 , 48(2) : 250 -256 . DOI: 10.3724/SP.J.1037.2011.00721

Abstract

1.2 mm thickness sheets of ultralight Mg–11Li–3Zn alloy with a density of 1.43 g/cm³ was obtained by casting and rolling, the elongation to failure is 200% at 573K with 1.67×10⁻² s⁻¹ tensile rate, which indicates high strain rate quasi–superplasticity. Significant dynamic recrystallization and grain refinement occur at 573 K and 1.67×10⁻² s⁻¹ under which the grain size turns from initial 27 μm into 9 μm, 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 1.67×10⁻² s⁻¹ is dislocation climb controlled by lattice diffusion.

Key words： Mg–Li–Zn alloy; quasi-superplasticity; mechanical property; microstructure; deformation mechanism

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