车柄潭,吴迪,张承宇,潘文宇,邹航,何长树,李金国

• 1:东北大学材料科学与工程学院
• 2:中国科学院金属研究所师昌绪先进材料创新中心
• 3:中国科学技术大学材料科学与工程学院
• 4:沈阳化工大学材料科学与技术学院

摘要(Abstract)：

采用光学显微镜、扫描电镜、显微维氏硬度计和拉伸试验机等研究了铸态VW54镁合金及其挤压态线材及退火态线材的显微组织和力学性能。结果表明：固溶处理使铸态VW54镁合金组织中晶界处分布的Mg_(24)(Gd, Y)_5相全部回溶，仅保留部分GdH_2稀土氢化物；热挤压后，线材发生了动态再结晶(DRX),晶粒尺寸显著细化，形成了以第二相流线为间隔的粗细等轴晶混合的双峰晶粒结构；在300℃低温退火时，第二相流线处会发生二次析出，形成短棒状或点状的第二相；而在400℃和500℃较高温度退火时，流线状分布的第二相会发生不同程度的回溶；挤压态样品具有(0001)//ED的基面织构，经过300℃×2 h和400℃×2 h退火后，再结晶使组织的织构取向趋于随机，而500℃×2 h退火后的合金线材则形成了典型的稀土织构；挤压态样品的屈服强度、抗拉强度和伸长率分别为169 MPa、255 MPa和17.5%,经300℃×0.5 h退火后，分别为148 MPa、253 MPa和20.3%,经400℃×0.5 h退火后，则分别为153 MPa、244 MPa和16.4%。

关键词(KeyWords)： VW54镁合金;挤压线材;退火处理;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52371037,52171055)

作者(Author): 车柄潭,吴迪,张承宇,潘文宇,邹航,何长树,李金国

DOI: 10.13289/j.issn.1009-6264.2025-0098

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