孙启蕊,王维

• 1:河南科技大学材料科学与工程学院

摘要(Abstract)：

为了提高8021铝合金的性能，采用Nd和Sr元素作为变质剂对其进行了改性处理。采用光学显微镜、扫描电镜、透射电镜、X射线衍射仪和万能试验机等研究了Nd和Sr元素的添加对8021铝合金的第二相形貌、晶粒尺寸和力学性能的影响。结果表明：添加Nd和Sr元素之后，合金的晶粒组织得到明显细化，第二相的形貌也发生了明显变化，添加Nd和Sr元素含量的不同，8021铝合金的力学性能也有明显的改善。添加0.4%Sr成功地将合金中的β(Al_5FeSi)相变质为α(Al_8Fe_2Si)相，其抗拉强度、伸长率和杯突值分别为110.9 MPa、6.27%和8.12 mm。添加0.06%Nd显著改善了合金中共晶硅相的形貌，从而改善其力学性能，抗拉强度、伸长率和杯突值分别达到了114.0 MPa、8.11%和8.26 mm。

关键词(KeyWords)： 8021铝合金;变质剂;第二相;力学性能

Abstract:

Keywords:

基金项目(Foundation): 河南省科技攻关项目(222102230005)

作者(Author): 孙启蕊,王维

DOI: 10.13289/j.issn.1009-6264.2024-0161

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