简介概要

稀土元素对Al-Cu-Mg-Ag合金显微组织影响的研究进展

来源期刊:中国有色金属学报2009年第8期

论文作者:宋旼 肖代红 贺跃辉 张福勤

文章页码:1355 - 1365

关键词:Al-Cu-Mg-Ag合金;稀土;显微组织;力学性能;

Key words:Al-Cu-Mg-Ag alloy; rare earth; microstructures; mechanical properties

摘    要:Al-Cu-Mg-Ag合金展示了比传统Al-Cu及Al-Cu-Mg合金更加优异的室温与高温力学性能,源于其主要强化相(Ω相)有较好的热稳定性。然而该合金的使用温度仍然低于200 ℃,当温度超过200 ℃时,Ω相的粗化速率急剧增加,容易发生共格失稳而转变为θ相,从而降低合金的高温力学性能。研究表明通过添加合适的稀土或过渡族元素可以有效地抑制Ω相的生长速率,提高Ω相的形核密度和热稳定性,从而提高合金的高温力学性能。综述了Ce、Yb及Sc元素对Al-Cu-Mg-Ag合金显微组织与力学性能的影响,并探讨了Ce、Yb及Sc元素提高Ω相热稳定性的机理。

Abstract: Al-Cu-Mg-Ag alloys exhibit much better mechanical properties than traditional Al-Cu and Al-Cu-Mg alloys at both room- and elevated temperatures because of the good thermal stability of the main strengthening phase (Ω phase). However, this type of alloys can only be used under 200 ℃. When the temperature is above 200 ℃, the coarsening speed of Ω phase increases dramatically, and Ω phase is very easy to lose coherent with the matrix and changes to θ phase, which substantially decreases the mechanical properties of the alloys at elevated temperature. It is shown that adding proper rare earth or transient elements can substantially inhibit the growth speed of Ω phase, increase the nucleation density and thermal stability of Ω phase, and thus improve the mechanical properties of Al-Cu-Mg-Ag alloys. The effects of Ce, Yb and Sc on the microstructures and mechanical properties of Al-Cu-Mg-Ag alloys were reviewed, and the mechanisms of the effects of Ce, Yb and Sc on the thermal stability of Ω phase were discussed.

基金信息:国家高技术研究发展专项经费资助项目
教育部留学归国人员科研启动项目资助项目
湖南省自然科学基金资助项目



详情信息展示

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基金项目:湖南省自然科学基金资助项目(07JJ3117),教育部留学归国人员科研启动项目资助项目;国家高技术研究发展专项经费资助项目(2006AA03Z567)

收稿日期:2008-09-26;修订日期:2008-12-18

通讯作者:宋  旼,副研究员,博士;电话:0731-88877880;E-mail: msong@mail.csu.edu.cn

(编辑 何学锋)


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