锻压技术

轧制温度对深冷AZ31镁合金组织与性能的影响

英文标题：Influence of rolling temperature on microstructure and properties of cryogenically treated AZ31 magnesium alloy

单位：1.湖南科技大学机电工程学院 2.湖南科技大学材料科学与工程学院 3.江苏大洋精锻有限公司

关键词：镁合金轧制深冷处理微观组织硬度

分类号：TG146.2

出版年,卷(期):页码：2024,49(1):134-141

摘要：

利用金相显微镜、X射线衍射仪和维氏硬度计研究了不同温度下轧制的深冷处理AZ31镁合金的组织与性能。结果显示：随着轧制温度的升高，轧制后深冷处理时镁合金所经历的激冷作用越强烈，镁合金发生的收缩越大；轧制温度为180~300 ℃时，镁合金的晶粒尺寸随轧制温度的升高变小，孪晶数量增多，并伴随有第二相析出，镁合金基面织构逐渐被弱化；轧制温度升高至360 ℃时，基面织构重新加强；硬度随轧制温度的升高先升高后降低，在300 ℃时硬度高达78.9 HV，这主要归因于细晶强化和第二相强化的作用；轧制温度达到420 ℃时，由于镁合金内部沿绝热剪切带出现裂纹，导致镁合金性能大幅下降。

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.

基金项目：

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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