Transactions of Materials and Heat Treatment

Title：Influence of rolling strain amount on microstructure and corrosion properties for AZ31 magnesium alloy

Authors： Li Qingfen Deng Bin Wu Yuanzhi Liu Chao Ye Tuo Liu Wei Liu Anmin Wu Zhaoxi Liu Jizhao Liu Wei

Unit： Hunan Institute of Technology Hunan University of Science and Technology

KeyWords： AZ31 magnesium alloy rolling strain amount microstructure recrystallized grain corrosion resistance property

ClassificationCode：TG132.25

year,vol(issue):pagenumber：2022,47(8):152-157

Abstract：

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.

Funds：

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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