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采用光学显微镜,扫描电子显微镜等手段研究了退火处理对热挤压Mg-3.8%Zn-1%Y合金组织及性能的影响。结果表明,该合金经425℃×15 min退火可通过完全再结晶获得细小的晶粒,合金的拉伸屈服强度为171.9 MPa,伸长率为29.8%。EBSD分析表明合金的优良的塑性来自于合金在拉伸过程中拉伸压缩({10 12}-{10 11})二次孪生的交互发生引起的协调变形。另外,拉伸过程中形成的较弱的“双峰”型{0002}纤维织构作为变形有利的取向也有利于改善合金的塑性。
The effects of annealing treatment on the microstructure and properties of hot-extruded Mg-3.8% Zn-1% Y alloy were studied by means of optical microscope and scanning electron microscope. The results show that the alloy can be obtained by complete recrystallization after annealing at 425 ℃ for 15 min. The tensile yield strength of the alloy is 171.9 MPa and the elongation is 29.8%. EBSD analysis shows that the excellent plasticity of the alloy comes from the coordinated deformation caused by the interaction between the secondary twins of the alloy under tension and compression ({10 12} - {10 11}) during the stretching process. In addition, the weakened “bimodal” {0002} fiber texture formed during the drawing process also favors the plasticity of the alloy as a distorted orientation.