The effects of solid solution on the deformation behavior of binary Mg–xZn (x = 0, 1, 2 wt%) alloys featuring a designated texture that enables extension twinning under tension parallel to the basal pole in most grains, were investigated using in-situ neutron diffraction and the EVPSC-TDT model. Neutron diffraction was used to quantitatively track grain-level lattice strains and diffraction intensity changes (related to mechanical twinning) in differently oriented grains of each alloy during cyclic tensile/compressive loadings. These measurements were accurately captured by the model. The stress-strain curves of Mg-1 wt%Zn and Mg-2 wt%Zn alloys show as-expected solid solution strengthening from the addition of Zn compared to pure Mg. The macroscopic yielding and hardening behaviors are explained by alternating slip and twinning modes as calculated by the model. The solid solution's influence on individual deformation modes, including basal 〈a〉 slip, prismatic 〈a〉 slip, and extension twinning, was then quantitatively assessed in terms of activity, yielding behavior, and hardening response by combining neutron diffraction results with crystal plasticity predictions. The Mg-1 wt%Zn alloy displays distinct yielding and hardening behavior due to solid solution softening of prismatic 〈a〉 slip. Additionally, the dependence of extension twinning, in terms of the twinning volume fraction, on Zn content exhibits opposite trends under tensile and compressive loadings.

中文翻译：

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Mg-xZn (x = 0, 1, 2 wt%) 合金中变形行为的固溶依赖性：原位中子衍射和晶体塑性建模


固溶体对二元 Mg- x Zn ( x = 0, 1, 2 wt%) 合金变形行为的影响进行了研究，该合金具有指定的织构，能够在平行于基极的张力下在大多数晶粒中产生延伸孪晶。原位中子衍射和 EVPSC-TDT 模型。中子衍射用于定量跟踪循环拉伸/压缩载荷期间每种合金不同取向晶粒的晶粒级晶格应变和衍射强度变化（与机械孪生相关）。模型准确地捕获了这些测量结果。 Mg-1 wt%Zn 和 Mg-2 wt%Zn 合金的应力-应变曲线显示，与纯 Mg 相比，添加 Zn 实现了预期的固溶强化。宏观屈服和硬化行为可以通过模型计算的交替滑移和孪生模式来解释。然后，通过将中子衍射结果与晶体塑性预测相结合，从活性、屈服行为和硬化响应方面定量评估固溶体对各个变形模式（包括基础<a>滑移、棱柱<a>滑移和延伸孪晶）的影响。由于棱柱<a>滑移的固溶软化，Mg-1 wt%Zn 合金表现出明显的屈服和硬化行为。此外，拉伸孪晶（就孪晶体积分数而言）对 Zn 含量的依赖性在拉伸和压缩载荷下表现出相反的趋势。