Abstract This paper examines the anisotropic and rate-dependent mechanical behavior of a rolled AZ31B magnesium alloy under multiaxial loading over a wide range of strain rates ranging from 10 − 4 to 10 5 s − 1 . It is shown that stress state, strain rate as well as loading orientation collectively influence the plastic flow. The rate dependence of the plastic flow in the material varies with the loading orientation. The texture-induced anisotropy, however, changes very little with the strain rate. The microstructures of the as-received and deformed specimens suggest that detailed analysis of initial spread in textures is necessary, especially under multiaxial stress states. The failure mechanisms are also observed to evolve with loading rate. Our results provide useful insights into the deformation and failure mechanisms in magnesium and extend the understanding of the mechanical properties of magnesium to the ultra-high strain rate regime ( 10 5 s − 1 ).

中文翻译：

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多轴加载下镁合金的动态塑性和动态破坏

摘要 本文研究了轧制 AZ31B 镁合金在 10 - 4 到 10 5 s - 1 的广泛应变速率范围内在多轴载荷下的各向异性和速率相关机械行为。结果表明，应力状态、应变率以及加载方向共同影响塑性流动。材料中塑性流动的速率依赖性随加载方向而变化。然而，织构引起的各向异性随应变率变化很小。原样和变形试样的微观结构表明，有必要对纹理的初始扩展进行详细分析，尤其是在多轴应力状态下。还观察到失效机制随着加载速率而演变。