Effect of solution treatment on microstructure and mechanical properties of as-cast Mg-4.8Al-2.7Ca-0.4Mn alloy

doi:10.13251/j.issn.0254-6051.2022.11.009

Abstract

Abstract: Microstructure evolution and mechanical properties of as-cast and solution treated Mg-4.8Al-2.7Ca-0.4Mn alloy were investigated by means of optical microscope, scanning electron microscope, X-ray energy spectrometer, X-ray diffractometer, hardness test and tensile property test, respectively. The results show that the α-Mg phase in the microstructure of as-cast Mg-4.8Al-2.7Ca-0.4Mn alloy presents typical dendrite morphology, and a large amount of Al₂Ca phases formed during solidification are distributed among dendrites. The solution treatment has a significant influence on the morphology of second phases. With the increase of solution treatment time, the dendrite segregation is weakened, and the Al₂Ca phase changes from reticular distribution to polygonal or fine blocky. The alloy solution treated at 500 ℃ for 4 h exhibits good comprehensive tensile properties, with the tensile strength of 222.0 MPa, the yield strength of 182.5 MPa, and the elongation of 4.5%.

Key words: solution treatment, Mg-4.8Al-2.7Ca-0.4Mn alloy, Al₂Ca phase, microstructure, mechanical properties

CLC Number:

TG146.2

Wang Jinwei, Zhou Jixue, Tang Shouqiu, Wu Jianhua, Zhang Linlin, Zhuang Haihua, Ma Baichang. Effect of solution treatment on microstructure and mechanical properties of as-cast Mg-4.8Al-2.7Ca-0.4Mn alloy[J]. Heat Treatment of Metals, 2022, 47(11): 59-63.

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