余文涛,孟祥炜,张晗,郝启堂,薛彦庆

• 1:西安文理学院陕西省表面工程与再制造重点实验室
• 2:西安文理学院西安市智能增材制造重点实验室
• 3:首都航天机械有限公司
• 4:西北工业大学国家凝固重点实验室

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)等研究了杂质Fe和Si对Al-Cu-Mn-Mg合金显微组织及力学性能的影响。结果表明：当合金含有0.20 mass%的杂质Fe时，凝固过程中形成的富Fe相为Al_7Cu_2(FeMn),与不含杂质Fe时相比，合金的力学性能略有下降，但仍具有良好的塑性。当合金含有0.20 mass%的Fe和0.20 mass%的Si时，热处理后合金中存在两种富Fe相，Al_7Cu_2(FeMn)和Al_(15)(FeMn)_3(SiCu)_2相，但Al_7Cu_2(FeMn)相居多。此外，含有杂质Fe和Si的合金凝固终了时在晶界处形成低熔点共晶组织(Al+Al_2Cu+Mg_2Si),导致合金在热处理过程中发生过烧现象。与仅含杂质Fe元素的合金相比，同时含有Fe和Si时合金的抗拉强度变化不大，但屈服强度增加了51.6 MPa,伸长率由15.4%大幅下降至6.0%。

关键词(KeyWords)： Al-Cu-Mn-Mg合金;富Fe相;过烧;共晶相

Abstract:

Keywords:

基金项目(Foundation): 2021年陕西省重点研发计划项目(2021ZDLGY14-07);; 陕西省自然科学基础研究计划(2023-JC-YB-409)

作者(Author): 余文涛,孟祥炜,张晗,郝启堂,薛彦庆

DOI: 10.13289/j.issn.1009-6264.2023-0302

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