Transactions of Materials and Heat Treatment

Title：Influence of rolling temperature on microstructure and properties of cryogenically treated AZ31 magnesium alloy

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ClassificationCode：TG146.2

year,vol(issue):pagenumber：2024,49(1):134-141

Abstract：

The microstructure and properties of cryogenically treated AZ31 magnesium alloy rolled at different temperatures were studied by metallographic microscopy, X-ray diffractometry and Vickers hardness tester. The results show that with the increasing of rolling temperature, the chilling effect experienced by the magnesium alloy during the cryogenic treatment after rolling is stronger, and the shrinkage of magnesium alloy is greater. When the rolling temperature is 180-300 ℃, the grain size of magnesium alloy becomes smaller with the increasing of rolling temperature, the number of twins increases, accompanied by the precipitation of the second phase, and the basal texture of magnesium alloy is gradually weakened. When the rolling temperature rises to 360 ℃, the basal texture is strengthened again. The hardness increases first and then decreases with the increasing of rolling temperature, and the hardness is as high as 78.9 HV at 300 ℃, which is mainly attributed to the effect of fine grain strengthening and second phase strengthening. When the rolling temperature reaches 420 ℃, the properties of magnesium alloy drop significantly due to the cracks appearing along the adiabatic shear band inside the magnesium alloy.

Funds：

国家自然科学基金资助项目（52174362,51975207）；湘潭市创建国家创新型城市建设专项项目（CG-YB20221043）；盐城市“黄海明珠人才计划”领军人才项目

作者简介：毛睿成（1995-），男，硕士研究生 E-mail：409353178@qq.com 通信作者：卢立伟（1983-），男，博士，教授 E-mail：cqulqyz@126.com

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