Effect of Pre-aging on Microstructure and Mechanical Properties of Wrought Magnesium Alloy
CHE Bo1, LU Liwei1,2, WU Muyi3, KANG Wei1, TANG Lunyuan4, FANG Daqing5
1 College of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China 2 Hunan Provincial Overseas-wisdom Innovation Center of New Energy Vehicle in Industrial-academic-research Cooperation, Hunan University of Science and Technology, Xiangtan 411201,China 3 Jiangnan Industrial Group Co., Ltd., Xiangtan 411207,China 4 Hunan Rongtuo New Material Research Co., Ltd., Xiangtan 411100,China 5 Jiaozuo Yirui Magnesium Alloy Co., Ltd., Jiaozuo 454950, China
Abstract: Comparing with cast Mg alloy, wrought Mg alloy has higher strength, better ductility and more diversified mechanical properties, and it consequently meet the diversified application requirements of structural parts. However, its comprehensive applications are limited by low absolute strength and poor plastic deformation capacity. Recent studies have found that pre-aging treatment can significantly improve the comprehensive mechanical properties of wrought Mg alloy. Therefore, summarizing the effects of pre-aging on wrought Mg alloys has important theoretical reference value and practical guiding significance. Pre-aging is an aging method for aging treatment before plastic processing. The pre-aging treatment can control the size, shape, distribution and orientation of the precipitated phase through under-aged, peak-aged and over-aging processes, and the precipitated phase plays an important role in improving the microstructure and mechanical properties of the alloys during subsequent plastic processing. The precipitated phase provided by pre-aging treatment can be severed as nucleation sites for dynamic recrystallization during subsequent plastic processing, thus promoting dynamic recrystallization, refining grains, activating non-basal slip and weakening basal texture. Moreover, the precipitated phase at grain boun-dary can obviously restrain the grain growth and effectively hinder the dislocation movement, and can also increase the accumulation of dislocations and the number of low-angle grain boundaries. Besides, increasing the precipitation can reduce the grain size and inhibit the nucleation and growth of {1012} extension twin, and also add the content of the {1011} contraction twin and the {1011}-{1012} double twin, which can increase nucleation sites of dynamic recrystallization and change the grain orientation, and then greatly increases the strength, yield stress and peak stress of the alloy. Meanwhile, the alloy ductility is also guaranteed, thereby greatly improving the comprehensive mechanical properties of Mg alloy. This article summarizes and analyzes the effects of pre-aging on microstructure and properties of wrought Mg alloys for Mg-Al, Mg-Zn, Mg-Sn and Mg-RE alloys. The review is mainly focused on the deformation process of compression, tensile, extrusion and rolling, which can provide va-luable reference for the preparation of Mg alloy with excellent comprehensive mechanical properties. In addition, the paper points out the development trend and research emphasis of the pre-aged wrought Mg alloy in the future.
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