屈华,刘伟东,刘海平

• 1:辽宁工业大学材料科学与工程学院

摘要(Abstract)：

采用金相显微分析技术、布氏硬度、XRD分析、室温与高温拉伸性能测试等方法,研究了Ag对Al-5.3Cu-0.8Mg合金铸态组织与时效硬化行为的影响。研究表明:Ag对合金铸态组织有细化作用,随着Ag含量的增加,枝晶得到细化;Ag添加缩短了合金的峰时效时间,其原因在于Ag原子提高了合金析出相的形核速率,进而加速了析出相的形成;随着Ag含量的增加,合金的硬度先增加后降低,含0.8%Ag的合金峰时效硬度最大;适量的Ag可以促进合金中Ω相的形成,过量的Ag将会抑制Ω相的形成;随着Ag含量的增加,合金的强度和热稳定性先升高后降低,当Ag含量为0.8%时,其强度和热稳定性均达到峰值;Ag提高合金强度与热稳定性的原因在于析出了热稳定性和强化作用比θ'、S'相更强的Ω相。

关键词(KeyWords)： Al-Cu-Mg-Ag合金;Ag添加;铸态组织;时效硬化;热稳定性

Abstract:

Keywords:

基金项目(Foundation): 辽宁省教育厅科学研究项目(L2015234)

作者(Author): 屈华,刘伟东,刘海平

DOI: 10.13289/j.issn.1009-6264.2015.12.012

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