| 摘要: |
| 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Al8Cu4Er和Al2Cu；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。 |
| 关键词: 铝-锂合金；热处理；组织演变；第二相；力学性能 |
| 基金项目:航天航空用高性能铝锂合金及先进制备加工技术研究（遵市科合重大（2020）2号）；超纯净均质细晶铝锂合金制备与加工创新技术研发及应用（黔财工（2020）284号）。 |
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| Effect of Heat Treatment on Microstructure and Properties of Al-Cu-Li-Mg-Zr-Er Alloy |
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Hong Dajun Li Aiwen Hu Limin Zhang Shuai Wang Haijun
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Guizhou Aerosace Xinli Technogy Co., Ltd., Zunyi 563114
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| Abstract: |
| 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 Al8Cu4Er and Al2Cu. 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. |
| Key words: Al-Li alloy；heat treatment；microstructure evolution；second phase；mechanical property |
