铜模喷铸Mg-6Al-1Y合金快冷组织形成及其固溶行为

doi:10.11896/cldb.19050059

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Abstract Effects of rare earth Y on quenched microstructure of spray-casted Mg-6Al alloy and its thermal stability behavior were investigated by vacuum induction melting and isothermal solid solution treatment. The results show that meta-stable Mg₂₄Y₅ forms during the non-equilibrium solidification of Mg-6Al-1Y, which promotes the grain refinement and suppresses the solute segregation. Consequently, the microstructure with fine spherical grain can be obtained. Cooling rate is increased with decreasing the inner diameter of copper mould. As a result, grain refinement is strengthened and the mean grain size is less than 2 μm as for inner diameter of 2 mm. The addition of Y improves the transformation temperature of grain boundary β phase from 425.57 ℃ to 429.46 ℃, which is beneficial to the thermal stability of quenched Mg-6Al alloy. The strengthening effect ascribed to grain refinement with high cooling rate favors the increase of micro-hardness of quenched Mg-6Al-1Y. The subsequent solid solution treatment with 400 ℃/2 h reduces its hardness value due to the dissolution of β phase.

Key words： non-equilibrium solidification solid solution microstructure refinement thermal stability rare earth magnesium alloy

Published: 06 November 2020

CLC number:

TG146.2

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

About author:: Liang Liuis a postgraduate student of Nanchang Hangkong University. He has studied in the School of Aeronautical Manufacturing Engineering of Nanchang Hangkong University since September 2017. He is mainly engaged in the development of rapidly solidified magnesium alloys and their high temperature properties.
Wei Yang, associate professor and master’s supervisor of Nanchang Hangkong University, obtained his Ph.D. degree from Northwestern Polytechnical University in 2010. He has worked in the School of Aeronautical Manufacturing Engineering of Nanchang Hangkong University. His research interests focus on non-equilibrium solidification theory and preparation of high perfor-mance metal structural materials. Fifty-six papers have been published in academic journals at home and abroad, including 37 by the first author or correspondent, 28 by SCI and 34 by EI.

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	LIU Liang
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Cite this article:

LIU Liang,WANG Zhitai,YANG Wei, et al. Quenched Microstructure of Spray-casted Mg-6Al-1Y Alloy and Its Solid Solution Behavior[J]. Materials Reports, 2020, 34(20): 20066-20069.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19050059 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20066

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