The principle of “stress equivalence” proposed by Basinski et al. offers insight regarding the nature of thermally activated plasticity of solid solution alloys of FCC and HCP (Mg) crystal structures at low temperatures. More recently, Leyson and Curtin have developed a theoretical framework which builds upon the Labusch solute strengthening model. The current work analyzes some recent results from the literature (for single crystal Mg–Zn, Mg–Y, and Mg–Dy) which permit a further examination of the concept of “stress equivalence.” Then, using an effective Taylor factor obtained from polycrystal plasticity modeling of textured Mg, the results of cryogenic mechanical tests of polycrystalline Mg–Sc and Mg–Y alloys are analyzed to test their adherence to the principle of “stress equivalence.” The analysis accounts for the truly long-range strengthening effect of grain boundaries through established, temperature dependent Hall-Petch relationships, but makes no other assumption of an “athermal stress” that is frequently mentioned in the literature. The results emphasize the broad applicability of Basinski's principle of stress equivalence, by showing that the low temperature thermally activated tensile response of textured, polycrystalline Mg alloys can be predicted once the flow stress at a single rate and temperature is known.

贝斯基斯基等人提出的“应力当量”原理。提供有关FCC和HCP（Mg）晶体结构的固溶合金在低温下热活化可塑性的性质的见解。最近，莱森（Leyson）和科廷（Curtin）建立了一个基于Labusch溶质强化模型的理论框架。当前的工作分析了文献中的一些最新结果（对于单晶Mg-Zn，Mg-Y和Mg-Dy），这些结果允许进一步研究“应力当量”的概念。然后，使用有效的从织构的Mg的多晶可塑性模型获得泰勒因子，分析多晶Mg-Sc和Mg-Y合金的低温力学测试结果，以测试其对“应力当量”原理的遵守情况。该分析通过建立的，与温度相关的Hall-Petch关系说明了晶界真正的长期强化作用，但没有对文献中经常提到的“无热应力”做出其他假设。结果表明，一旦知道了单一速率和温度下的流变应力，就可以预测织构的多晶Mg合金的低温热活化拉伸响应，从而说明了贝斯基斯基应力等效原理的广泛适用性。