王松辉,孙有平,何江美,蒋莉萍,李旺珍

• 1:广西科技大学机械工程学院

摘要(Abstract)：

采用光学显微镜(OM)、差热分析(DSC)、X射线衍射、拉伸试验机、SEM断口分析等研究均匀化处理工艺对铸态Al-4.5Cu-1.5Mg-0.6Mn-0.2Ti-0.5Zr合金显微组织及力学性能的影响。结果表明:Al-4.5Cu-1.5Mg-0.6Mn-0.2Ti-0.5Zr合金铸态组织中存在严重的枝晶偏析,沿晶界分布着大量块状析出相,主要为Al2Cu及Al2Cu Mg相,还有少量Al7Cu2Fe相;合金经485℃×10 h均匀化处理后,组织中的非平衡低熔点组织基本溶入基体,晶粒得到明显的细化,晶间组织分布均匀,断口为韧窝和准解理型的混合断裂特征,合金表现出较好的力学性能,硬度、抗拉强度、伸长率分别为146 HV、317.7 MPa、8.67%。

关键词(KeyWords)： Al-4.5Cu-1.5Mg-0.6Mn-0.2Ti-0.5Zr;均匀化处理;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 广西自然科学基金(2016GXNSFDA380008);; 广西重点研发计划(桂科AC16380032);; 柳州市科学研究与技术开发计划(2016C050202,2017BD20301);; 广西科技大学自然科学基金(校科自1419208)

作者(Author): 王松辉,孙有平,何江美,蒋莉萍,李旺珍

DOI: 10.13289/j.issn.1009-6264.2018-0009

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