T6热处理对Al-Mg-Zn-<i>x</i>Sc系铝合金组织演变和力学性能的影响

doi:10.11896/cldb.25010051

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Abstract Al-2.5Mg-6Zn-xSc (0.00%, 0.15%, 0.30%, 0.45% and 0.60%) alloys with different Sc contents were prepared and T6 heat treatment was carried out in this work, and effect of T6 heat treatment on microstructure evolution and mechanical properties of the alloys were studied. The results show that the non-equilibrium phases on the grain boundaries of the alloys after T6 heat treatment are dissolved, and the metastable MgZn₂ phases form in the alloys. Al₃Sc phases begin to precipitate in the alloy with addition of 0.3%Sc, and they are increased with increase of Sc content. The alloys change from coarse and big grains to fine equiaxed grains, and the grain size of the alloys is decreased with increase of Sc content. Microhardness and tensile strength of alloys after heat treatment are higher than those of the as-cast alloys, and they show an increase trend with increase of Sc addition, and they reach the highest of 188.6HV and 505.3 MPa for the alloy with addition of 0.6%Sc, which are 23.2% and 43.1% higher than those of the as-cast alloy. Elongation of alloys after heat treatment is higher than that of the as-cast alloys, and it reaches the highest of 15.3% for the alloy with addition of 0.3%Sc, which is 12.0% higher than that of the as-cast alloy. The metastable MgZn₂ phase formed during the heat treatment process can effectively prevent dislocation movement, and the dissolved non-equilibrium phases on the grain boundaries can decrease segregation of alloys. In addition, the Al₃Sc particles dispersed in α-Al phase can effectively inhibit recrystallization of the Sc-containing alloys, and therefore, mechanical properties of the alloys can be improved.

Key words： aluminium alloy heat treatment organization structure mechanical property

Published: Online: 2026-02-13

CLC number:

TG156

Corresponding Authors: xuqin@haut.edu.cn

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	BI Xiaoqin
	YANG Kaifang
	ZHENG Zeyuan
	CUI Xiya
	FU Ying
	XU Qin

Cite this article:

BI Xiaoqin,YANG Kaifang,ZHENG Zeyuan, et al. Effect of T6 Heat Treatment on Microstructure Evolution and Mechanical Properties of Al-Mg-Zn-xSc Alloy[J]. Materials Reports, 2026, 40(3): 25010051-6.

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https://www.mater-rep.com/EN/10.11896/cldb.25010051 OR https://www.mater-rep.com/EN/Y2026/V40/I3/25010051

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