刘文义,王永善,李亚鹏,张会

• 1:陕西理工大学材料科学与工程学院

摘要(Abstract)：

通过半固态电磁搅拌铸造法制备了Al-8Zn-1.2Mg-1.5Cu合金，并对其进行均匀化退火处理。采用光学显微镜、X射线衍射仪、扫描电镜、金属涡流电导仪和维氏硬度计等对合金组织和性能进行分析与测试。结果表明：铸态Al-8Zn-1.2Mg-1.5Cu合金的组织主要由α-Al基体和MgZn_2相组成，并存在严重的枝晶偏析；随着均匀化退火温度从400℃升高到460℃,粗大的网状枝晶组织逐渐消失，MgZn_2和非平衡共晶相逐渐溶入α-Al基体中，合金的硬度和电导率先增大后减小，在440℃退火保温12 h后硬度达到最大值，为134.8 HV0.3;在460℃均匀化退火时，随着保温时间从6 h增加到24 h,合金中的共晶组织不断溶解，硬度先增大后减小，在保温时间为18 h时达到最大值，为131.7 HV0.3,合金的电导率则是呈先下降再上升随后下降的趋势。

关键词(KeyWords)： Al-Zn-Mg-Cu合金;均匀化退火;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 陕西省科技厅项目(2024GX-YBXM-361,2024GX-YBXM-376,2024CY2-GJHX-37);; 陕西省秦创原“科学家+工程师”队伍建设项目(2024QCY-KXJ-013)

作者(Author): 刘文义,王永善,李亚鹏,张会

DOI: 10.13289/j.issn.1009-6264.2024-0084

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