Effect of Zr content on aging precipitation and properties of Al-Zr alloy

doi:10.13251/j.issn.0254-6051.2021.09.008

Abstract

Abstract: Effects of Zr addition (0.05, 0.15 and 0.25wt%) on precipitation, hardness, electrical conductivity of solution-treated and solution-rolled Al-Zr alloys were compared and studied. The results show that the grain size of solution-treated Al-Zr alloys deceases with the increase of Zr content, but the grain size of solution-rolled alloys is insensitive to the Zr addition. Due to the precipitation of Al₃Zr particles in the aging process at 350 ℃, the hardness of solution-treated Al-Zr alloys increases with the increase of Zr content. However, stronger lattice distortion field leads to the decrease of electrical conductivity. During the aging of solution-rolled Al-Zr alloys, a large number of deformation dislocations promote precipitation of the Al₃Zr phase, which makes the Al-Zr alloys aged at 250 ℃ to have better combined properties of hardness and conductivity than that aged at 300 ℃. Especially, with the addition of 0.25wt%Zr in the Al-Zr alloys, the precipitation strengthening during aging can effectively compensate the hardness lowering caused by dislocation annihilation, so that the high hardness of the alloys is maintained. Overall, the optimal combined properties of hardness and conductivity of 47.5 HV0.05 and 55.6%IACS can be obtained by the solution-rolled Al-0.25wt%Zr alloys aged at 250 ℃ for 25 h.

Key words: Al-Zr alloy, Zr content, aging precipitation, mechanical properties, electrical conductivity

CLC Number:

TG244.2

Chen Baoan, Zhu Zhixiang, Wang Ruihong, Chen Xin, Han Yu, Li Hongying, Xiao Xiang. Effect of Zr content on aging precipitation and properties of Al-Zr alloy[J]. Heat Treatment of Metals, 2021, 46(9): 47-52.

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