热处理对Al-Cu-Li-Mg-Zr-Er合金组织和性能的影响

Effect of Heat Treatment on Microstructure and Properties of Al-Cu-Li-Mg-Zr-Er Alloy

综合采用扫描电子显微镜(SEM)、硬度计和万能拉伸机等测试手段研究了不同热处理工艺对Al-Cu-Li-Mg-Zr-Er合金锻板微观组织和力学性能的影响规律。研究结果表明,在合金锻板组织中存在较多尺寸不均的带状残余第二相颗粒,主要为Al_(8)Cu_(4)Er和Al_(2)Cu;在经过固溶、淬火和人工时效处理之后,合金组织中的未溶第二相明显减少,屈服强度、抗拉强度和伸长率分别可达370MPa、465MPa和8.4%;合金最佳固溶时效工艺为:510℃/1h+160℃/36h。

The microstructure and mechanical properties of T6 Al-Cu-Li-Mg-Zr-Er alloy were studied by scanning electron microscope(SEM),hardness test and tensile mechanical properties test.The results show that there is serious segregation in the alloy,and the second phases are Al_(8)Cu_(4)Er and Al_(2)Cu.After solid solution,quenching and artificial aging treatment,the yield strength,tensile strength and elongation of the alloy can reach 370MPa,465MPa and 8.4%respectively.The optimum single-stage aging process of the alloy is 160℃/36h.