深冷处理对快冷Mg-6Al-1Y合金等温时效析出的影响

doi:10.11896/cldb.21070188

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Abstract Effects of cryogenics on microstructure and subsequent precipitation behavior of non-equilibrium solidified Mg-6Al-1Y alloy were investigated by spray casting and aging treatment. The results show that the microstructure of quenched alloy is composed of fine α-Mg grain with undeve-loped petal-like shape, divorced eutectic β phase at grain boundary and Al₂Y rare earth phase. The micro-stress and plastic deformation arising from cryogenics are beneficial to the grain refinement and formation of high density dislocation structure. After aging with 250 ℃/4 h, discontinuous precipitation occurs at the grain boundary of quenched alloy, accompanied by the preferential growth of needle-plate β phase with ideal coherent relationship with the matrix. Cryogenics accelerates the precipitation of β phase, and favors the continuous precipitation at grain interior with short rod-like shape. The resultant hardness reaches 77.2HV, which is 23.1% higher than that of the initial rapidly cooled alloy.

Key words： magnesium alloy cryogenics non-equilibrium solidification aging precipitation

Published: 25 June 2023 Online: 2023-06-20

CLC number:

TG146.2

Fund:National Natural Science Foundation of China (52061032, 51461032) and the Education Department of Jiangxi Province (GJJ180513).

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	Articles by authors
	LIU Ling
	YANG Wei
	WU Zongkai
	XU Yong
	YU Huan

Cite this article:

LIU Ling,YANG Wei,WU Zongkai, et al. Effect of Cryogenics on Isothermal Aging of Rapidly Cooled Mg-6Al-1Y Alloy[J]. Materials Reports, 2023, 37(12): 21070188-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21070188 OR http://www.mater-rep.com/EN/Y2023/V37/I12/21070188

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