Transactions of Materials and Heat Treatment

Title：Influence of high strain rate multi-directional forging on microstructure and corrosion resistance property for AZ31 magnesium alloy

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

Unit： Hunan Institute of Technology

KeyWords： AZ31 magnesium alloy high strain rate multi-directional forging cumulative strain recrystallized grain corrosion resistance property

ClassificationCode：TG132.25

year,vol(issue):pagenumber：2021,46(8):7-11

Abstract：

The AZ31 magnesium alloy after homogenization treatment was subjected to high strain rate multi-directional forging, and the influences of different cumulative strains on the microstructure of AZ31 magnesium alloy were studied by the testing methods such as optical microscope (OM) and electron backscatter diffractometer (EBSD). Then, the corrosion behavior of alloy in NaCl solution with the mass fraction of 3.5% under different cumulative strains was studied by electrochemical tests and other methods. The experiment results show that compared with before forging, the average grain size of alloy after high strain rate multi-directional forging is greatly reduced and the corrosion resistance property is improved. When the cumulative strain is 1.32，the alloy has a uniform and fine grain structure with the average grain size of 7.8218 μm，the recrystallization fraction is 79.40683%，the average corrosion rate is Vi= 0.072 mm·a-1，the corrosion resistance property of alloy is the best. However, when the cumulative strain is beyond 1.32，the recrystallized grains grow up due to the action of self-activation，and the recrystallization degree and microstructure uniformity of alloy decrease as well as the corrosion resistance property.

Funds：

湖南省自然科学基金资助项目(2019JJ30009)；湖南省教育厅科学研究项目(20C0567，19C0508)；衡阳市科技计划项目基础研究专项（202002042096）

邓彬(1981-)，男，硕士，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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