Exceptional mechanical properties of AZ31 alloy wire by combination of cold drawing and EPT
Exceptional mechanical properties of AZ31 alloy wire by combination of cold drawing and EPT
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DOI：
10.1016/j.jmst.2020.02.044
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发表时间：
2020-08
影响因子：
10.9
通讯作者：
Z. Shan;J. Bai;Jianfeng Fan;Hongfei Wu;Hua Zhang;Qiang Zhang;Yucheng Wu;Weiguo Li;Hongbiao Dong;Bingshe Xu
中科院分区：
文献类型：
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作者：
Z. Shan;J. Bai;Jianfeng Fan;Hongfei Wu;Hua Zhang;Qiang Zhang;Yucheng Wu;Weiguo Li;Hongbiao Dong;Bingshe Xu
采用冷拉-电脉冲处理工艺（EPT），成功制备出抗拉强度为400 MPa、延伸率为28.5%的AZ 31镁合金线材，其直径为0.66 mm。显微组织观察表明，EPT处理后，晶粒尺寸细化到1 μm左右，织构指数最大时的基面织构强度减弱到7.18。由于热效应和非热效应的耦合作用，EPT可通过提高位错的迁移率和原子扩散来显著加速再结晶。最后，通过在相对低的温度（433 K）下在很短的时间（30 s）内完成的静态再结晶，在EPT样品中获得均匀的超细晶组织。
A 0.66 mm-diameter AZ31 alloy wire with ultimate tensile strength of 400 MPa and elongation of 28.5% was successfully prepared via the combination of cold-drawing and electropulsing treatment processing (EPT). Microstructure observation showed that the grain size of EPTed samples was refined to about 1 μm and the basal texture strength with maxima texture index was weakened to 7.18. EPT can significantly accelerate recrystallization by enhancing the mobility of dislocation and atomic diffusion due to the coupling of the thermal and athermal effects. Finally, uniform ultrafine-grained structure was obtained in the EPTed samples by static recrystallization completed in a very short time (30 s) at relatively low temperature (433 K).