High Temperature Creep Behavior of Al-0.2Sc-0.04Zr Alloys

Cai Bin; Li Weijie; Zhou Weiwei; Li Jinwen; Li Zhihua; Li Weihua

doi:10.15980/j.tzzz.2014.02.012

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High Temperature Creep Behavior of Al-0.2Sc-0.04Zr Alloys
Vol. 34, Issue 2, Pages: 113-115(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.02.012

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[1]蔡彬,李卫杰,周伟伟,李金文,李志华,李卫华.Al-0.2Sc-0.04Zr合金的高温蠕变行为[J].特种铸造及有色合金,2014,34(02):113-115.

Cai Bin, Li Weijie, Zhou Weiwei, et al. High Temperature Creep Behavior of Al-0.2Sc-0.04Zr Alloys. [J]. Special Casting & Nonferrous Alloys 34(2):113-115(2014)
[1]蔡彬,李卫杰,周伟伟,李金文,李志华,李卫华.Al-0.2Sc-0.04Zr合金的高温蠕变行为[J].特种铸造及有色合金,2014,34(02):113-115. DOI： 10.15980/j.tzzz.2014.02.012.

Cai Bin, Li Weijie, Zhou Weiwei, et al. High Temperature Creep Behavior of Al-0.2Sc-0.04Zr Alloys. [J]. Special Casting & Nonferrous Alloys 34(2):113-115(2014) DOI： 10.15980/j.tzzz.2014.02.012.

摘要

在前期工作基础上

研究了经不同冷轧和时效处理的Al-0.2Sc-0.04Zr合金在300℃时的蠕变行为。发现合金的高温蠕变属于第二相粒子强化材料的蠕变

存在蠕变门槛应力

且冷轧和时效联合处理能进一步改善合金高温抗蠕变能力。虽然预时效+冷轧+再时效处理可获得更好的室温抗拉强度

但未经预时效的冷轧+时效处理却可获得好的高温抗蠕变性能。显微组织观察表明

Al-0.2Sc-0.04Zr合金抗蠕变性能的改善与晶粒细化和共格Al3（Sc

Zr）沉淀相的形成及分布有关。

Abstract

Based on previous work

the creep behavior of Al-0.2Sc-0.04Zr alloys at 300℃after different cold-rolling and ageing treatments was investigated.It is found that the creep behavior of Al-0.2Sc-0.04Zr alloys belongs to the creep behavior of the secondary phase precipitate-strengthening materials

meanwhile

the threshold stress exists during creep

furthermore

the combination treatment of cold-rolling and ageing can increase the high temperature creep resistance.Although a better tensile strength can be obtained by pre-ageing+cold-rolling+re-ageing for the alloy

much better creep resistance at high temperature can be obtained by cold-rolling+ageing for the alloy.Microstructure observation reveals that the improvement of creep resistance of Al-0.2Sc-0.04Zr alloys at high temperature is relevant with the grain refinement

the formation and distribution of coherent Al3（Sc

Zr）precipitates.