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[Li Yuyu,Han Tingzhuang,Chu Zhibing,Xue Chun,Yang Qianhua,Zhao Xiaodong and Gao Hong.Effect of Strain Path on Mechanical Behavior of AZ31 Magnesium Alloy[J].Rare Metal Materials and Engineering,2022,51(8):2785~2793.]
Effect of Strain Path on Mechanical Behavior of AZ31 Magnesium Alloy
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Received:June 27, 2021  Revised:August 04, 2021
DOI:
Key words: AZ31 magnesium alloy  strain path  mechanical behavior  twin  dislocation  texture
Foundation item:National Key R&D Program of China (2018YFB1307902), National Natural Science Foundation of China (U1710113), Joint Postgraduate Training Base of Shanxi Province (2018JD33), Top young talents in Shanxi Province, Shanxi Excellent Youth Fund (201901D211312), Innovative talents in Colleges and universities of Shanxi Province, Outstanding young academic leaders in Shanxi Province, Transformation and cultivation project of scientific and technological achievements in Colleges and universities of Shanxi Province(2019KJ028), Leading talents of emerging industries in Shanxi Province, Postgraduate Education Innovation Program of Shanxi Province (2019SY482)
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Li Yuyu,Han Tingzhuang,Chu Zhibing,Xue Chun,Yang Qianhua,Zhao Xiaodong and Gao Hong  
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Abstract:
      Extruded AZ31 magnesium alloy was used as raw specimens, and pre-deformation experiments were conducted in the direction of ∥ED (extrusion direction) and ⊥ED at room temperature. The instantaneous deformation stress state of a cross-sectional reduced wall was simulated in the cold Pilgering process. Then, the pre-deformed specimens were sampled for secondary compression, and the microstructure after two deformations was characterized by electron backscatter diffraction. The effects of structure and texture on mechanical behavior under the condition of strain path change were investigated. Results show that the yield strength of the AZ31 magnesium alloy is improved by pre-deformation. The improvement is attributed to the {102} tension twins resulting from the pre-deformation, further resulting in grain refinement and increase in dislocation density. Moreover, the appearance of twinning changes the grain orientation. The weakening of the basal texture (or the strengthening of the twin texture) may play an important role in improving the mechanical properties of the AZ31 magnesium alloy. The yield strength of the ∥ED-3% and ⊥ED-3% samples is increased by 66.7% and 6.6%, respectively.