(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，北京 100088)
摘 要: 通过OM、SEM、X射线衍射、DSC差热分析和室温拉伸性能测试，研究固溶处理对7150铝合金挤压板带组织和力学性能的影响。结果表明：合金固溶处理温度越高，时间越长，粗大第二相溶解越多；合金在480℃进行固溶处理时，出现过烧组织，双级固溶处理制度没有提高本合金开始出现过烧组织的温度；随着合金固溶处理时间的延长，组织出现粗化和再结晶的趋势；本合金适合采用475 ℃，2 h的单级固溶制度，经(475 ℃，2 h) + (120 ℃，24 h)固溶−峰时效处理后，合金抗拉强度、屈服强度和伸长率分别为650 MPa、600 MPa和13.5%。
关键字: 7150铝合金；固溶处理；显微组织；力学性能
mechanical properties of 7150 aluminum alloy
（State Key Laboratory of Nonferrous Metals and Processes,
General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract:The effects of solution treatment on the microstructures and mechanical properties of 7150 aluminum alloy extrusion plate were studied by OM, SEM, XRD, DSC and room temperature tensile test. The results show that the coarse second phase dissolves more adequately when the alloy is solution treated at higher temperature for longer time. The overheated structure appears in alloys when quenched at 480 ℃, and the temperature at which overheated structure appears cannot be enhanced by two-stage solution. The trend of microstructure coarsening and recrystallization appears with prolongating the solution time. The suited solution of the alloy is single-stage solution of 475 ℃, 2 h. After solution and peak aging of (475 ℃, 2 h)+(120 ℃, 24 h), the ultimate tensile strength, yield strength and elongation are 650 MPa, 600 MPa and 13.5%, respectively.
Key words: 7150 Al alloy; solution treatment; microstructure; mechanical properties
