孙昭乾,张奎,李兴刚,李永军,马鸣龙,石国梁,袁家伟

• 1:有研科技集团有限公司有色金属材料制备加工国家重点实验室
• 2:有研工程技术研究院有限公司
• 3:北京有色金属研究总院

摘要(Abstract)：

研究了5种不同Sn元素含量的Mg-Sn二元合金的铸态组织及力学性能,Sn元素的含量分别为2 mass%、5 mass%、8 mass%、10 mass%、12 mass%。结果表明:合金中的第二相为Mg_2Sn相,且随着Sn元素含量的增加,Mg_2Sn相的数量不断增加,多数Mg_2Sn相与基体形成共晶组织,并在晶界处偏聚,形成连续的网状。合金的平均晶粒尺寸随着Sn元素含量的增加先减小后增大,当Sn元素含量为8 mass%时,Mg-Sn二元合金具有最小的平均晶粒尺寸。在室温和150℃下,随着Sn元素含量的增加,合金的硬度(HB),抗拉强度(R_m)和屈服强度(R_(p0.2))都呈上升趋势,但是合金的伸长率(A%)先增大后减小。Mg-12 mass%Sn合金具有最高的抗拉强度,分别为174 MPa(室温)和130 MPa(150℃),Mg-8 mass%Sn合金具有最大伸长率,分别为11%(室温)和12%(150℃)。

关键词(KeyWords)： Mg-Sn合金;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51871195)

作者(Author): 孙昭乾,张奎,李兴刚,李永军,马鸣龙,石国梁,袁家伟

DOI: 10.13289/j.issn.1009-6264.2020-0623

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