AZ80合金的动态包辛格效应及其各向异性

Experimental Study on Dynamic Bauschinger Effect and Its Anisotropy of AZ80 Alloy

针对AZ80合金棒材开展了高应变率和准静态加载-卸载-反向加载试验,考察了加载应变率对AZ80镁合金的包辛格效应及其各向异性的影响。研究结果表明,在拉伸-卸载-反向压缩加载路径下,AZ80合金的力学行为具有应变率相关性,随着加载应变率的增加,材料的包辛格效应减弱;AZ80合金的包辛格效应存在各向异性,径向的包辛格效应强于轴向的包辛格效应;随着预拉伸应变量的增加,轴向包辛格效应增强,但径向包辛格效应减弱,高应变率加载下包辛格效应的各向异性随预拉伸应变量的增加而减弱的程度相较于准静态更为剧烈。

Loading-unloading-reverse loading tests at high and quasi-static strain rates were conducted to investigate the effect of strain rate on the Bauschinger effect and its anisotropy of AZ80 magnesium alloy bars.The test results show that the mechanical behavior of AZ80 magnesium alloy has strain-rate dependence under the loading path of tension-unloading-reverse compression,and the Bauschinger effect is weakened as the strain rate increases.It is found that the Bauschinger effect is anisotropic,and the Bauschinger effect in the radial direction is stronger than that in the direction of the axis of the bar.As the pre-tension strain increases,the Bauschinger effect in the axial direction increases,but the radial Bauschinger effect decreases.Compared with quasi-static loading,the anisotropy of the Bauschinger effect at the high strain-rate decreases more dramatically with the increase of pre-tension strain.