An investigation of the effect of solutes on the migration of a single $\left\{10\overline{1}2\right\}$ Gd decorated twin boundary in a Mg-4wt.% Gd binary alloy in terms of the corresponding stress-strain response and the defect structure in the wake of (de)twinning was undertaken in this work. The results were benchmarked against those of a pure Mg sample that was tested under same conditions. We established that the critical stresses for both twinning and detwinning increased by 29% and 10%, respectively, due to the addition of Gd. We showed that the latter is mediated by the pinning effect of Gd atoms that decorated the pre-existing twin boundaries in the alloy. Conversely, a 68% decrease in the detwinning stress was recorded in pure Mg. We attributed the decrease to the nucleation-free nature of detwinning along with the absence of solutes atoms at the pre-existing twin boundaries. Unlike previous investigations, the work does not just highlight how twinning and detwinning affects the concurrent slip activity in pure Mg and Mg alloys, it establishes a direct link between these activities and the magnitude of the observed mechanical response.

溶质对单一物质迁移影响的研究$\left\{10\stackrel{￣}{1}2\right\}$这项工作根据相应的应力-应变响应和孪生（去）孪生后的缺陷结构，对 Mg-4wt.% Gd 二元合金中的孪晶边界进行了 Gd 装饰。结果与在相同条件下测试的纯镁样品的结果进行了基准比较。我们发现，由于添加了 Gd，孪晶和解孪晶的临界应力分别增加了 29% 和 10%。我们表明，后者是由装饰合金中预先存在的孪晶边界的 Gd 原子的钉扎效应介导的。相反，纯镁的解孪应力降低了 68%。我们将这种减少归因于解孪的无核性质以及预先存在的孪晶边界处不存在溶质原子。与之前的调查不同的是，