张浩,吴美娴,郭科宏,文胜平,態湘沅,聂祚仁

• 1:北京工业大学新型功能材料教育部重点实验室

摘要(Abstract)：

采用显微硬度计与透射电镜等研究了Mg和Si的添加对AlCuMnZr合金时效析出行为和微观组织的影响。结果表明：同时添加Mg和Si显著提高了合金的时效硬度并保证了良好的热稳定性，Al5.5Cu0.25Mg0.3Mn0.2Zr0.15Si合金经540℃固溶7 h及175℃时效24 h后达到峰值硬度，为156.3 HV0.2。Mg的添加细化了AlCuMnZr合金中θ′相尺寸，增加了θ′相数密度，使其分布更弥散、均匀。而在添加Si后，由于σ相、Q相的析出和θ′相周围Si的偏聚，使θ′析出相尺寸进一步减少、粗化速度降低。但在225℃长时间热暴露后，会因为Si的偏聚消失，使部分θ′相粗化，合金的热稳定性下降。

关键词(KeyWords)： AlCuMnZr合金;热稳定性;θ′相;微合金化

Abstract:

Keywords:

基金项目(Foundation): 国家重点研究开发项目(2021YFB370902,2021YFB3704204,2021YFB3704205);; 国家自然科学基金创新研究项目(51621003)

作者(Author): 张浩,吴美娴,郭科宏,文胜平,態湘沅,聂祚仁

DOI: 10.13289/j.issn.1009-6264.2022-0526

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