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Experimental and simulation analysis of texture formation and deformation mechanism of rolled AZ31B magnesium alloy under dynamic loading

机译:动态载荷下AZ31B镁合金轧制组织形成和变形机理的实验与仿真分析

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摘要

Magnesium alloys components are potentially used under shock loading conditions. Considering the fact that deformation behavior is completely different under high strain rate conditions compared to quasi-static conditions, it is very important to evaluate the dynamic mechanical response and deformation mechanisms of magnesium alloys under impact loading. In this research, texture formation, micro-structural changes and dynamic deformation behavior of rolled AZ31B in the tempered H24 stress-relieved conditions, shock-loaded under compressive dynamic loading, were investigated. Texture measurements showed that the as-received AZ31B alloy had a strong (00.2) basal texture. Four groups of cylindrical samples were cut in the rolling direction (RD), in 45° to the RD, in the transverse direction (TD) and in the direction perpendicular to the RD-TD plane. Dynamic shock loading of the test samples were conducted using Split Hopkinson Pressure Bar at room temperature at strain rates ranging from 600 to 1100 s~(-1), while loading direction was parallel to the longitudinal axis of the cylindrical samples. After high strain rate deformation, although the loading direction was different, a strong (00.2) basal texture was observed in all samples. It was inferred that increasing the strain rate led to an increase in strength and ductility, but to a decrease in twinning fraction, indicating the possible activation of non-basal slip systems. Besides, a high degree of mechanical anisotropy was found for all strain rates used such that the lowest strength was registered for the samples cut along the direction parallel to the rolling direction. A viscoplastic self-consistent model with a tangent approach was used to corroborate the experimental textures and possible deformation mechanisms by simulation.
机译:镁合金部件可能会在冲击载荷条件下使用。考虑到高应变速率条件下的变形行为与准静态条件下的变形行为完全不同的事实,评估镁合金在冲击载荷下的动态力学响应和变形机理非常重要。在这项研究中,研究了在回火条件下,压缩动载荷下经回火的H24应力消除条件下轧制AZ31B的织构形成,微观组织变化和动态变形行为。织构测量表明,原样的AZ31B合金具有很强的(00.2)基础纹理。在轧制方向(RD),与RD成45°,横向(TD)和垂直于RD-TD平面的方向上切割四组圆柱样品。使用分裂霍普金森压力棒在室温下以600至1100 s〜(-1)的应变速率进行测试样品的动态冲击加载,而加载方向平行于圆柱形样品的纵轴。高应变率变形后,尽管加载方向不同,但在所有样品中均观察到了较强的(00.2)基础纹理。可以推断,增加应变速率会导致强度和延展性的增加,但导致孪晶分数降低,这表明可能会激活非基础的滑移系统。此外,对于所有使用的应变率,发现高度的机械各向异性,使得沿着平行于轧制方向的方向切割的样品的最低强度被记录。使用切线方法的粘塑性自洽模型,通过仿真来证实实验纹理和可能的变形机制。

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