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首页> 外文期刊>International Journal of Plasticity >Strain rate sensitivities of deformation mechanisms in magnesium alloys
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Strain rate sensitivities of deformation mechanisms in magnesium alloys

机译：镁合金中变形机制的应变率敏感性

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Strain rate sensitivity (SRS) is an important material property that governs the rate dependent mechanical behaviors associated with deformation rate changes, creep, stress relaxation, formability, etc. The variety of activated deformation mechanisms of magnesium alloys under different loading paths, e.g. tension vs. compression, implies that SRS of magnesium alloys obviously depends on loading paths, and each deformation mechanism has its own SRS. However, a single SRS scheme is commonly employed in numerical modeling to describe the rate dependent behaviors of magnesium alloys, which disregards the distinction of SRSs among different deformation mechanisms. The implementation of the constitutive model that works for a wide range of values of SRSs has been a challenge to crystal plasticity modeling for metals with multiple deformation mechanisms like magnesium. Especially, very small values of SRS, corresponding to low rate-sensitivity, generally lead to high nonlinearity involved in the governing equations, and then computational failure. In this paper, the elasto-viscoplastic self-consistent (EVPSC) crystal plasticity model is improved to enhance its numerical robustness for very small SRS values. Taking advantage of this improvement, different SRSs for various deformation mechanisms are employed to investigate the strain rate dependent behaviors of magnesium alloys at room temperature. First, the SRSs for various deformation mechanisms are determined based on the compressive stress relaxation tests on an AZ31 alloy plate; secondly, the obtained SRSs are applied to interpret internal elastic strain evolution of the same magnesium alloy under in-plane compression; finally, the determined SRSs are applied to investigate the deformation of another AZ31 alloy under various deformation paths and strain rates. The present work is the first effort on studying effects of strain rate-sensitivity on mechanical behavior of Mg alloys under wide range of applied strain rates
机译：应变速率灵敏度（SRS）是一种重要的材料特性，可以控制与变形速率变化，蠕变，应力松弛，可成形性等相关的速率相关的机械行为。在不同负载路径下的镁合金的各种活性变形机制，例如，镁合金的各种活性变形机制。张力与压缩，意味着镁合金的SR显然取决于负载路径，每个变形机制都有自己的SRS。然而，在数值模型中通常采用单个SRS方案以描述镁合金的速率依赖性行为，这忽略了不同变形机制之间SRS的区别。用于为各种SRS值计算的本构模型的实现对于具有多种变形机制的金属晶体塑性建模是挑战，如镁的多变形机制。特别是，对应于低速率灵敏度的SRS值非常小，通常导致控制方程中涉及的高非线性，然后导致计算失败。本文改善了弹性粘塑料自洽（EVPSC）晶体塑性模型，以增强其对非常小的SRS值的数值鲁棒性。利用这种改进，采用不同的变形机制的不同SRS来研究室温下镁合金的应变速率依赖性行为。首先，基于AZ31合金板上的压缩应力松弛测试来确定各种变形机构的SRS;其次，将获得的SRSS应用于在平面内压缩下解释相同镁合金的内部弹性应变演化;最后，应用所确定的SRS以在各种变形路径和应变速率下研究另一种AZ31合金的变形。本作本作是在广泛的应用应变率下研究应变率敏感性对镁合金力学行为的影响

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