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首先对新型Al-4.8Cu-1.8Zn-1Ti-0.6Mg合金进行了不同时间的530℃固溶处理及不同时间的165℃人工时效处理，随后进行不同时间的自然时效处理。采用电子万能试验机和扫描电镜研究了不同工艺处理后合金的力学性能和微观组织。结果表明：新型Al-4.8Cu-1.8Zn-1Ti-0.6Mg合金经530℃固溶处理8 h及165℃人工时效3 h后，其抗拉强度可达387.72 MPa,屈服强度达245.54 MPa,断后伸长率为9.8%;经15、75和135天自然时效后，合金的抗拉强度分别为422.97、390.09和387.72 MPa,断后伸长率分别为5.03%、8.4%和9.8%。可以看出随着自然时效时间增加合金的抗拉强度降低、断后伸长率升高，最终趋于稳定；热处理后合金内存在3种第二相组织，其中亮银色θ(Al_2Cu)相在晶界处粗大析出会导致合金的抗拉强度下降，暗灰色Al_3Ti相易聚集，聚集后的粗大Al_3Ti相会导致合金的变形能力下降。
Abstract：Firstly, the new Al-4.8Cu-1.8Zn-1Ti-0.6Mg alloy was subjected to solution treatment at 530 ℃ for different time and artificial aging at 165 ℃ for different time, followed by natural aging treatment for different time. The mechanical properties and microstructure of the alloy treated with different processes were studied using an electronic universal testing machine and scanning electron microscopy. The results show that the tensile strength, yield strength and elongation of the new Al-4.8Cu-1.8Zn-1Ti-0.6Mg alloy after solution treatment at 530 ℃ for 8 h and artificial aging at 165 ℃ for 3 h are 387.72 MPa, 245.54 MPa and 9.8%, respectively. After natural aging for 15, 75 and 135 days, the tensile strength of the alloy is 422.97, 390.09 and 387.72 MPa, respectively, and the elongation is 5.03%, 8.4% and 9.8%, respectively. It can be seen that as the natural aging time increases, the tensile strength of the alloy decreases, and the elongation increases, ultimately tending to stabilize. After heat treatment, there are three types of second phase in the alloy, among which the coarse precipitation of bright silver θ(Al_2Cu) phase at grain boundaries leads to a decrease in the tensile strength of the alloy, while the dark gray Al_3Ti phase is prone to aggregation, and the aggregated coarse Al_3Ti phase leads to the decrease in the deformation ability of the alloy.
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基本信息:
中图分类号:TG146.21;TG156
引用信息:
[1]柴智,张俊婷,王宥宏.热处理时间对Al-4.8Cu-1.8Zn-1Ti-0.6Mg合金力学性能和组织的影响[J],2024,45(02):63-70.
基金信息:
山西省基础研究计划面上项目(202203021221147)