Effects of Ag Micro-alloying on Heat-resistant Properties of Al-Cu-Mg-Mn-（Zr,Ti）Alloy

Xiao Daihong~ 1; Song Min~1; Chen Kanghua~1; Wang Jiannong~2

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Effects of Ag Micro-alloying on Heat-resistant Properties of Al-Cu-Mg-Mn-（Zr,Ti）Alloy
Issue 1, Pages: 7-10(2007)
Published： 2007 ，
DOI：

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[1]肖代红,宋旼,陈康华,王健农.Ag对Al-Cu-Mg-Mn-(Zr,Ti)合金高温性能的影响[J].特种铸造及有色合金,2007(01):7-10+7.

Xiao Daihong~ 1, Song Min~1, Chen Kanghua~1, et al. Effects of Ag Micro-alloying on Heat-resistant Properties of Al-Cu-Mg-Mn-（Zr,Ti）Alloy. [J]. Special Casting & Nonferrous Alloys (1):7-10(2007)
[1]肖代红,宋旼,陈康华,王健农.Ag对Al-Cu-Mg-Mn-(Zr,Ti)合金高温性能的影响[J].特种铸造及有色合金,2007(01):7-10+7. DOI：

Xiao Daihong~ 1, Song Min~1, Chen Kanghua~1, et al. Effects of Ag Micro-alloying on Heat-resistant Properties of Al-Cu-Mg-Mn-（Zr,Ti）Alloy. [J]. Special Casting & Nonferrous Alloys (1):7-10(2007) DOI：

摘要

采用拉伸测试与透射电镜（TEM）分析

研究了微量Ag对Al-5·3Cu-0·8Mg-0·5Mn-0·5（Zr+Ti）（质量分数）合金高温性能的影响。结果显示

Ag的微合金化改变了合金的时效过程

使合金的室温强度和高温性能得到明显提高。含Ag的合金在185℃峰时效时的强化析出相

由与基体共格的片状Ω相及少量θ′相组成。微量Ag促进合金强化的原因主要在于Ω相的沉淀硬化;其高强耐热性能则是因Ω相比θ′相具有更好的热稳定性。

Abstract

The effects of minor Ag addition on the heat-resistant properties of Al-5.3Cu-0.8Mg-0.5Mn-0.5（Zr+Ti）alloy have been investigated by tensile testing and transmission electromicroscope（TEM）.It is revealed that the ambient strength and heat-resistant properties of the alloy can be improved greatly as a result of changing the aging process of the alloy with Ag addition.The strengthening precipitates in the alloy containing Ag is composed of coherent laminate Ω phase and a small amount of θ’ phase with peak aging at 185 ℃.Strengthening mechanism of minor Ag addition is attributed to the precipitating hardening of Ω phase

and the improvement of heat-resistant properties of the alloy is a result of higher thermal stability of Ω phase than that of θ’ phase.