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.
刘亮, 汪志太, 杨伟, 王振军, 蔡长春, 余欢. 铜模喷铸Mg-6Al-1Y合金快冷组织形成及其固溶行为[J]. 材料导报, 2020, 34(20): 20066-20069.
LIU Liang, WANG Zhitai, YANG Wei, WANG Zhenjun, CAI Changchun, YU Huan. Quenched Microstructure of Spray-casted Mg-6Al-1Y Alloy and Its Solid Solution Behavior. Materials Reports, 2020, 34(20): 20066-20069.
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2020, Vol. 34 
