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Research on microstructure and texture of as-extruded AZ31 magnesium alloy during thermal compression Fuqiang Zhao1, Xiaofeng Ding1,a)

, Renjie Cui2, Xiaoyu Fan2, Yugui Li2, Yuanhua Shuang2

1

Gear Research Institute, Taiyuan University of Technology, Taiyuan 030024, China; The Collaboration Innovation Center of Taiyuan Heavy Machinery Equipment, Taiyuan University of Science and Technology, Taiyuan 030024, China; and Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China 2 The Collaboration Innovation Center of Taiyuan Heavy Machinery Equipment, Taiyuan University of Science and Technology, Taiyuan 030024, China; and Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China a) Address all correspondence to this author. e-mail: [email protected] Received: 21 September 2018; accepted: 25 February 2019

The hot compression behavior of as-extruded AZ31 magnesium alloy was investigated to study the effect of compression temperature and strain on microstructure evolution, grain orientation, and texture evolution. The thermal compression tests of AZ31 Mg alloy were carried out on the Gleeble-3800 simulation device: With constant strain, the temperatures were 250, 300, 400, and 500 °C, respectively; at constant temperature, the strains were 0.2, 0.4, 0.6, and 0.8, respectively. After observation and analysis of compressed samples, it is found that with 0.65 strain and 0.05 s
1 strain rate, grains were equiaxed, well refined, and distributed uniformly at 400 °C. At this temperature, new orientation between {0001} and {1210} or {0110} appeared in grains; new texture components close to {1122} and {1212} pyramidal textures were formed, but whole texture strength was weakened and anisotropy of the sample was reduced. With the increase of strain, grains became smaller and volume fraction of DRX grain became higher; the original basal texture was replaced by prismatic textures; after 0.4 strain, the increase of strain did not change the texture component, but only the pole density.

Introduction Compared with aluminum alloys and other metal materials, magnesium alloy had advantages of low density, high specific strength, specific stiffness etc. It had been used in aerospace, automotive, and other fields because it could effectively reduce weight, save fuel, and reduce emissions [1]. Due to its good casting properties, most of magnesium alloy parts used in automobile were produced by casting, such as intake manifold, seat structure, and mounting bracket [2]. Compared with casting magnesium alloys, wrought magnesium alloys had higher strength, better ductility, and better comprehensive mechanical properties [3]. However, the application of magnesium alloy was limited because of its HCP crystal structure, which has limited numbers of slip systems, and poor formability at room temperature [4]. The mechanical properties of magnesium allo