High Temperature Creep Behavior of Mg-12Gd-2Y-0.5Zr Magnesium Alloy

Fu Sanling; Li Quan’an; Jing Xiaotian; Zhou Wei

doi:10.15980/j.tzzz.2013.12.023

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High Temperature Creep Behavior of Mg-12Gd-2Y-0.5Zr Magnesium Alloy
Vol. 33, Issue 12, Pages: 1090-1093(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.12.023

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[1]付三玲,李全安,井晓天,周伟.Mg-12Gd-2Y-0.5Zr合金的高温蠕变行为[J].特种铸造及有色合金,2013,33(12):1090-1093.

Fu Sanling, Li Quan’an, Jing Xiaotian, et al. High Temperature Creep Behavior of Mg-12Gd-2Y-0.5Zr Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 33(12):1090-1093(2013)
[1]付三玲,李全安,井晓天,周伟.Mg-12Gd-2Y-0.5Zr合金的高温蠕变行为[J].特种铸造及有色合金,2013,33(12):1090-1093. DOI： 10.15980/j.tzzz.2013.12.023.

Fu Sanling, Li Quan’an, Jing Xiaotian, et al. High Temperature Creep Behavior of Mg-12Gd-2Y-0.5Zr Magnesium Alloy. [J]. Special Casting & Nonferrous Alloys 33(12):1090-1093(2013) DOI： 10.15980/j.tzzz.2013.12.023.

摘要

研究了Mg-12Gd-2Y-0.5Zr系镁合金的高温蠕变行为。结果表明

试验合金的蠕变抗力普遍优于WE54合金

在50

0MPa的应力范围内

200℃时应力指数n在2.5

.8之间

300℃时n在4.2

.1之间

该系列合金的蠕变主要由位错攀移控制向位错交滑移控制机制转变;在200

00℃的温度范围内

50 MPa条件下蠕变激活能Qc为66kJ/mol

70MPa条件下蠕变激活能Qc为87.2kJ/mol之间。随着温度和应力的增加

与纯镁的晶界扩散激活能（80kJ/mol）越来越接近。

Abstract

The creep behavior of Mg-12Gd-2Y-0.5Zr magnesium alloy at high temperature was analyzed. The results show that the creep resistance of the experimental alloy is generally superior to that of commercial WE54alloy

and the stress exponent（n）is in range of 2.5

.8at 200℃and 4.2

.1at 300 ℃ under a stress of 50

0MPa.The creep mechanisms of the series alloy mainly are controlled by dislocation climbing towards dislocation cross-slip.The creep activation energy（Qc）is 66kJ/mol under 50 MPa and 87.2kJ/mol under 70MPa at 200

00℃.With the increase of temperature and stress

creep activation energy of Mg-12Gd-2Y-0.5Zr alloy is near to diffusion activation energy（80kJ/mol）of pure magnesium more and more.

关键词

Mg-12Gd-2Y-Zr抗蠕变性应力指数蠕变激活能

Keywords

Mg-12Gd-2Y-ZrCreep ResistanceStress ExponentCreep Activation Energy

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Present Research Status and Developing Tendency of Heat Resistance Mg Alloy