李彩琼,刘浩,颜佳,史丹丹,余鑫祥

• 1:烟台南山学院科技与数据学院
• 2:烟台南山学院材料科学与工程学院
• 3:山东南山铝业股份有限公司

摘要(Abstract)：

采用光学显微镜、扫描电镜、X射线衍射仪、电子探针显微分析、透射电镜等研究了微量Sc、Er的添加对Al-Cu-Zr合金均匀化过程中微观组织演变的影响。结果表明:与铸态Al-Cu-Sc-Zr合金相比,铸态Al-Cu-Er-Zr合金晶粒尺寸更加粗大,但该合金中枝晶界上的非平衡凝固相更加断续且窄化,枝晶内部颗粒相尺寸更小;均匀化后,虽然Al-Cu-Er-Zr合金中的残留相数量更多,但其中的Al_7Cu_2Fe相得到了较大幅度的细化和球化。这主要归因于Er在α-Al中的固溶度极低,凝固时Er在固液界面前沿位置大量聚集引起成分过冷,有利于最后凝固共晶相的细化,同时Er会与Fe结合并改变含Fe相的形态并限制其长大。此外,由于大量Er原子被难溶微米级Al_8Cu_4Er初生相和亚微米级Al_3(Er,Zr)粒子所占据,过低的溶质原子过饱和度导致其很难与Zr协同析出纳米尺寸的Al_3(Er,Zr)粒子,因此在Al-Cu-Er-Zr合金中仅可见粗大的Al_3Zr纳米粒子析出。

关键词(KeyWords)： Al-Cu合金;Sc;Er;均匀化;微观组织;第二相

Abstract:

Keywords:

基金项目(Foundation): 山东省自然科学基金(ZR2020ME005);; 山东省高等学校“青创科技支持计划”(2021KJ089)

作者(Author): 李彩琼,刘浩,颜佳,史丹丹,余鑫祥

DOI: 10.13289/j.issn.1009-6264.2024-0385

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