Effect of La-Ce mixed rare earth on mechanical properties and  corrosion resistance of Mg-Al-Mn alloy

doi:10.13251/j.issn.0254-6051.2020.06.039

Abstract

Abstract: Effect of La-Ce mixed rare earths on the microstructure, mechanical properties and corrosion resistance of Mg-Al-Mn alloys were investigated. The Mg-Al-Mn alloys with rare earth content (mass fraction) of 4.63%, 5.81% and 6.18% respectively were smelted in a T-1200CB crucible furnace. The specimens were solution treated at 430 ℃ for 24 h in a box-type resistance furnace, and then aged at 200 ℃ for 24 h. The microstructure of the specimens in different heat treatment states were observed, the tensile, hardness and salt spray corrosion tests were carried out on the specimens after solution treatment and aging. The effects of mixed rare earth on the microstructure, mechanical properties and corrosion resistance of the alloys were analyzed. The results show that with the increase of La-Ce mixed rare earth content in the alloy, the Mg₁₇Al₁₂ phase is gradually replaced by the Al₄(La, Ce) phase; the hardness, tensile strength and elongation are gradually reduced, and the mechanical properties are decreased; the corrosion rate of the alloy is gradually decreased and the corrosion resistance is improved.

Key words: Mg-Al-Mn magnesium alloy, La-Ce mixed rare earth, microstructure, mechanical properties, corrosion resistance

CLC Number:

TG146.2

Huang Ming, Chen Lichao, Chu Qian, Zhao Liping, Qin Chen, Tian Zhihua, Zhang Huimin. Effect of La-Ce mixed rare earth on mechanical properties and corrosion resistance of Mg-Al-Mn alloy[J]. Heat Treatment of Metals, 2020, 45(6): 189-193.

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Effect of La-Ce mixed rare earth on mechanical properties and corrosion resistance of Mg-Al-Mn alloy

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