热轧-固溶-时效过程7055铝合金板中第二相演变及电导率

doi:10.13251/j.issn.0254-6051.2026.02.013

摘要/Abstract

摘要： 采用金相显微镜、扫描电镜、差示扫描量热仪及电导率仪对7055铝合金板热轧-固溶-时效过程中的第二相及电导率进行了表征。结果表明,热轧态、固溶态以及时效态合金组织均由再结晶晶粒、亚晶粒以及形变晶粒组成,且固溶态和时效态合金中再结晶组织占比均低于50%,表明所采用的热处理工艺较为合理。3种状态7055铝合金板组织内均存在沿轧制方向呈链状分布的第二相,热轧态组织中主要第二相为Al₇Cu₂Fe、η(MgZn₂)和AlZnMgCu,经固溶处理后,η(MgZn₂)回溶,主要第二相为Al₇Cu₂Fe,再经时效处理后,固溶至基体中的Mg、Zn元素正常析出,并部分以Al₇Cu₂Fe相为形核质点析出η(MgZn₂)强化相。3种状态组织内吸热峰积分面积及第二相占比有所差异,导致电导率存在差异,其中,固溶态合金的吸热峰积分面积及第二相占比最低分别为3.19 mJ、0.89%,因此其电导率也最低,为28.07%IACS。

关键词: 7055铝合金, 固溶处理, 时效处理, 第二相, 电导率

Abstract: Secondary phase and conductivity during hot rolling-solid solution-aging process of 7055 aluminum alloy plate were characterized using metallographic microscope, scanning electron microscope, differential scanning calorimeter, and conductivity meter. The results show that the microstructure of hot-rolled, solution treated, and aged alloys is composed of recrystallized grains, subgrains, and deformed grains, and the proportion of recrystallized grains in the solution treated and aged alloys is less than 50%, indicating that the heat treatment process used is relatively reasonable. There are chain-like secondary phases distributed along the rolling direction in microstructure of the 7055 aluminum alloy plates in three different states. The main secondary phases in the hot-rolled microstructure are Al₇Cu₂Fe, η(MgZn₂) and AlZnMgCu, after solution treatment, η(MgZn₂) phase dissolves, and the main secondary phase is Al₇Cu₂Fe, then after aging treatment, Mg and Zn elements solid dissolved in the matrix precipitate normally, and some of them precipitate as η(MgZn₂) strengthening phases with Al₇Cu₂Fe phase as nucleation sites. There are differences in the integrated area of the endothermic peak and the proportion of the secondary phase within the three different states alloy, resulting in differences in conductivity. Among them, the solution treated alloy has the lowest integrated area of the endothermic peak and the proportion of the secondary phase, which are 3.19 mJ and 0.89%, respectively. Therefore, its conductivity is also the lowest, which is 28.07%IACS.

Key words: 7055 aluminum alloy, solution treatment, aging, secondary phase, conductivity

中图分类号:

TG146.2

胡焱玲, 杨帅, 康圆圆, 柴斐, 汪卓然, 郭佩宏, 贾本业. 热轧-固溶-时效过程7055铝合金板中第二相演变及电导率[J]. 金属热处理, 2026, 51(2): 82-88.

Hu Yanling, Yang Shuai, Kang Yuanyuan, Chai Fei, Wang Zhuoran, Guo Peihong, Jia Benye. Evolution of secondary phase and conductivity of 7055 aluminum alloy plate during hot rolling-solid solution-aging process[J]. Heat Treatment of Metals, 2026, 51(2): 82-88.

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