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采用扫描电镜、透射电镜、显微硬度仪和电子万能材料实验机等研究了预拉伸以及自然时效处理对Al-Cu-Li合金的微观组织演变以及力学性能的影响。结果表明：时效前进行预拉伸处理可缩短Al-Cu-Li合金到达峰值时效所需的时间，促进析出大量均匀细小呈弥散分布的T1相，提升合金的力学性能，其屈服强度、抗拉强度和断后伸长率分别为596 MPa、618 MPa和11.2%;与预拉伸后再时效处理的合金相比，在预拉伸之前进行自然时效，可促进位错和δ′相的交互作用，进一步提高人工时效时T1相的析出动力同时抑制了δ′相形成，使合金具有更优的力学性能，其屈服强度、抗拉强度和断后伸长率分别提升到611 MPa、624 MPa和11.4%。
Abstract：Effect of pre-stretching and natural aging treatment on microstructure evolution and mechanical properties of an Al-Cu-Li alloy was studied using scanning electron microscopy, transmission electron microscopy, microhardness tester, and electronic universal material testing machine. The results show that the pre-stretching treatment before aging can shorten the time required for the Al-Cu-Li alloy to reach peak aging, promote the precipitation of a large number of uniformly fine T1 phases in a dispersed distribution, and improve the mechanical properties of the alloy. Moreover, its yield strength, tensile strength, and elongation are 596 MPa, 618 MPa, and 11.2%, respectively. Compared with the alloy that undergoes pre-stretching and then aging treatment, natural aging before pre-stretching can promote the interaction between dislocation and δ′ phase, further improve the precipitation kinetics of T1 phases during artificial aging, and suppress the formation of δ′ phase, resulting in better mechanical properties of the alloy, with the yield strength, tensile strength, and elongation increased to 611 MPa, 624 MPa, and 11.4%, respectively.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2024-0429
中图分类号:TG146.21;TG156.92
引用信息:
[1]徐进军,伍彪,朱宇航等.预拉伸及自然时效处理对Al-Cu-Li合金组织与性能的影响[J].材料热处理学报,2025,46(08):28-36.DOI:10.13289/j.issn.1009-6264.2024-0429.
基金信息:
湖南省自然科学基金科教联合项目(2022JJ60093); 湖南省教育厅科学研究项目优秀青年项目(22B1082)