朱慧慧,魏福安,丁勇,李芝兰,马鸿斌

• 1:青海大学青海省新型轻合金重点实验室
• 2:青海省高性能轻金属合金与成型工程研究中心
• 3:青海理工学院工学院

摘要(Abstract)：

首先以20∶1的挤压比在300℃下对Mg-6Sn-3Al-1Zn合金进行挤压，随后在350℃短时间退火2、5和10 min。采用X射线衍射仪(XRD)、扫描电镜(SEM)、电子背散射衍射(EBSD)和万能试验机等研究了退火后合金的微观组织和力学性能。结果表明：随着退火时间的增加，合金中的Mg_2Sn析出相的数量先增加后趋于稳定，合金的平均晶粒尺寸和{0001}基面织构先增大后减少；当退火时间为5 min时，一方面，Mg_2Sn析出相数量增多，分布更加弥散，并且{0001}基面织构最强，会导致合金的强度上升，但另一方面，平均晶粒尺寸的增加会导致合金的强度降低，这导致合金的屈服强度变化不大；合金的屈服强度从退火2 min时的218 MPa提高到退火5 min时的251 MPa,这说明多峰组织合金中大小晶粒的体积分数对合金的屈服强度影响较大；当退火时间为5 min时，合金中的小晶粒(<10μm)所占体积分数约为80%,中等尺寸晶粒(10～15μm)所占体积分数约为16%,大晶粒(>15μm)所占体积分数约为4%,此时，合金的综合力学性能达到最优，抗拉强度、屈服强度和伸长率分别为372 MPa、251 MPa和17.1%。

关键词(KeyWords)： Mg-6Sn-3Al-1Zn合金;退火时间;多峰组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 青海省应用基础研究项目(2022-ZJ-709)

作者(Author): 朱慧慧,魏福安,丁勇,李芝兰,马鸿斌

DOI: 10.13289/j.issn.1009-6264.2024-0472

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