陈家浩,王文鑫,赵瑞欣,郑罗肖,叶文涛,周庆阳,翁瑶瑶

• 1:南京工程学院材料科学与工程学院
• 2:南京工程学院江苏省先进结构材料与应用技术重点实验室

摘要(Abstract)：

针对汽车发动机用Al-Cu合金耐热性较差、寿命较低等问题，研究了回归再时效处理及Zr微合金化对其微观组织和力学性能的影响。结果表明：微量Zr的添加能够有效抑制Al-Cu合金在铸造过程中AlCuFe有害相的形成，促进该初生相在固溶处理中的溶解，同时生成了新的AlCuZr初生相；回归再时效能够促进Al-Cu-Zr合金中Al_3Zr相的析出，可作为θ′相的异质形核点，促进时效阶段θ′相的析出；相比单级时效，回归再时效后Al-Cu-Zr合金组织中的θ′析出相和Al_3Zr相的数量更多，尺寸更加细小且分布更加密集，析出强化作用得到提高，使得合金峰值硬度提高到137.8 HV0.5,比单级时效合金的峰值硬度提高了4%。

关键词(KeyWords)： Al-Cu合金;Zr微合金化;回归再时效;析出强化;Al_3Zr

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学青年基金(52101141);; 江苏省研究生科研与实践创新计划项目(SJCX23＿1188);; 江苏省大学生创新创业训练计划项目(202411276068Y,202411276011Z)

作者(Author): 陈家浩,王文鑫,赵瑞欣,郑罗肖,叶文涛,周庆阳,翁瑶瑶

DOI: 10.13289/j.issn.1009-6264.2024-0324

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