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【轻有色合金】镧铈混合稀土对AlSi10MgMn合金组织及性能的影响
发布时间:2020-09-15 文章来源:本站原创
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王 吉1 徐世文2 田 政3 张德平3 崔晓鹏1 孟 健3

(1.长春工业大学先进结构材料教育部重点实验室,材料科学与工程学院;2.中信戴卡股份有限公司工程技术研究院; 3.中国科学院长春应用化学研究所稀土资源利用国家重点实验室)

要:采用光学显微镜、扫描电镜、维氏硬度仪及室温拉伸测试等手段,对不同稀土(LaCe)含量的AlSi10MgMn合金铸态组织及力学性能进行研究。结果表明,混合稀土(LaCe)对合金组织中的α-Al、共晶SiAlMnSiMg2Si相均有细化作用,并使β-AlFeSi相消失。稀土(LaCe)含量为0.1%时,合金的综合力学性能较好,硬度(HV)、抗拉强度和屈服强度分别为82.76373.05 MPa281.37 MPa,较未加稀土的合金分别提高12.95%17.29%43.44%,而伸长率为2.26%,降低了11.37%。另外,混合稀土(LaCe)对合金断裂方式影响较小。

关键词:AlSi10MgMn合金;镧铈混合稀土;微观组织;力学性能

中图分类号:TG146.21;TG146.4+5  文献标志码A

DOI10.15980/j.tzzz.2020.08.023


Effects of Rare Earth Elements(La, Ce) Addition on Microstructures and Mechanical Properties of AlSi10MgMn Alloy

Wang Ji1, Xu Shiwen2, Tian Zheng3, Zhang Deping3, Cui Xiaopeng1, Meng Jian3

(1.Key Laboratory of Advanced Structural Materials, Ministry of Education, School of Materials Science and Engineering, Changchun University of Technology; 2.Engineering Technology Institute, CITIC Dicastal Co., Ltd.; 3.State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences)

Abstract: The as-cast microstructure and mechanical properties of AlSi10MgMn alloy with different rare earth (La, Ce) contents were investigated by means of optical microscope, SEM, Vickers hardness and tensile test at room temperature. The results show that rare earth (La, Ce) can refine α-Al, eutectic silicon, AlMnSi and Mg2Si phases in the alloy, and eliminate β-AlFeSi phase. When the content of added rare earth (La, Ce) is 0.1%the hardness, tensile strength and yield strength of the alloy reach 82.76 HV373.05 MPa and 281.37 MPa, respectivelywhich are 12.95%17.29% and 43.44% higher than those of ones without rare earth, while the elongation is reduced to 2.26%, decreased by 11.37%. Furthermore, the addition of rare earth (La, Ce) has little effect on the fracture mode of the alloy.

Key Words: AlSi10MgMn Alloy, Rare Earth (La,Ce), Microstructures, Mechanical Properties

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