锻压技术

轧制应变量对AZ31镁合金组织与腐蚀性能的影响

英文标题：Influence of rolling strain amount on microstructure and corrosion properties for AZ31 magnesium alloy

单位：湖南工学院湖南科技大学

分类号：TG132.25

出版年,卷(期):页码：2022,47(8):152-157

摘要：

对固溶处理后的AZ31镁合金板材进行轧制，利用金相显微镜（OM）、电子背散射衍射仪（EBSD）研究了不同轧制应变量对AZ31镁合金显微组织的影响；使用电化工作站,研究了不同轧制应变量对合金在质量分数为3.5%的NaCl溶液中腐蚀行为的影响。实验结果表明：轧制是以孪晶再结晶的方式来细化镁合金晶粒，当轧制应变量过低时，合金组织中晶粒的尺寸大小与分布不均，且大晶粒中存在孪晶，再结晶程度低，耐腐蚀性能低于固溶态的合金；随着轧制应变量的增加，合金组织中晶粒的细化程度、分布的均匀性与再结晶程度提高，合金的耐腐性能增强；当轧制应变量为1.61时，合金获得了均匀细小的再结晶晶粒组织，平均晶粒尺寸为3.41 μm，自腐蚀电位为-1.42 V,自腐蚀电流密度为1.92×10-3 mA·cm-2，耐腐蚀性能最优。

The solution-treated AZ31 magnesium alloy sheet was rolled, and the influences of different rolling strain amounts on the microstructure of AZ31 magnesium alloy were studied by metallography microscope (OM) and electronic backscatter diffractive (EBSD), Then, the influences of different rolling strain amounts on the corrosion behavior of alloy in NaCl solution with mass fraction of 3.5% was studied by electrochemical workstation. The experiment results show that the grains of magnesium alloy are refined by twinning recrystallization method during rolling. When the rolling strain amount is too low, the grain size and distribution in the alloy structure are not uniform, and there are twins in the large grains, the recrystallization degree is low, and the corrosion resistance property is lower than that of the alloy in the solid solution state. However, with the increasing of rolling strain amount, the grain refinement degree, distribution uniformity and recrystallization degree in the alloy structure increase, and the corrosion resistance property of the alloy increases. When the rolling strain amount is 1.61, the alloy obtains a uniform and fine recrystallized grain structure with the average grain size of 3.41 μm, self-corrosion potential of -1.42 V and the self-corrosion current density of 1.92×10-3 mA· cm-2, and the best corrosion resistance property is obtained.

基金项目：

国家自然科学基金资助项目（52171115）；湖南省教育厅科学研究项目(20C0567)；衡阳市科技计划项目基础研究专项（202002042096）；大学生创新创业训练计划项目（S202211528050，S202211528094）；难加工材料高效精密加工湖南省重点实验室开放基金项目（E21532，E21748）

作者简介：李庆芬(1983-)，女，硕士，高级实验师，E-mail：76559886@qq.com；通信作者：吴远志(1984-)，男，博士，教授，E-mail：2911065882@qq.com

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