Effect of T6 Heat Treatment on Microstructure Evolution and Mechanical Properties of Al-Mg-Zn-xSc Alloy
BI Xiaoqin1, YANG Kaifang1, ZHENG Zeyuan1, CUI Xiya2, FU Ying3, XU Qin2,*
1 School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450001, China 2 School of Mechanic and Electrical Engineering, Henan University of Technology, Zhengzhou 450001, China 3 Songshan Lake Materials Laboratory, Dongguan 523808, Guangdong, China
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.
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2026, Vol. 40 
