Stress corrosion cracking (SCC) can be a crucial problem in applying rare earth (RE) Magnesium alloys in environments where mechanical loads and electrochemical driven degradation processes interact. It has been proven already that the SCC behavior is associated with microstructural features, compositions, loading conditions, and corrosive media, especially in-vivo. However, it is still unclear when and how mechanisms acting on multiple scales and respective system descriptors predictable contribute to SCC for the wide set of existing Mg alloys. In the present work, suitable literature data along SCC of Mg alloys has been analyzed to enable the development of a reliable SCC model for MgGd binary alloys. Pearson correlation coefficient and linear fitting are utilized to describe the contribution of selected parameters to corrosion and mechanical properties. Based on our data analysis, a parameter ranking is obtained, providing information on the SCC impact with regard to ultimate tensile strength (UTS) and fracture elongation of respective materials. According to the analyzed data, SCC susceptibility can be grouped and mapped onto Ashby type diagrams for UTS and elongation of respective base materials tested in air and in corrosive media. The analysis reveals the effect of secondary phase content as a crucial materials descriptor for our analyzed materials and enables better understanding towards SCC model development for Mg-5Gd alloy based implant.

中文翻译：

---

微观组织、成分和加载条件对镁合金应力腐蚀开裂行为影响的数据分析

在机械载荷和电化学驱动的降解过程相互作用的环境中应用稀土 (RE) 镁合金时，应力腐蚀开裂 (SCC) 可能是一个关键问题。已经证明，SCC 行为与微观结构特征、成分、负载条件和腐蚀性介质有关，尤其是在体内。然而，目前尚不清楚作用于多个尺度的机制以及可预测的各个系统描述符何时以及如何对现有镁合金的 SCC 产生影响。在目前的工作中，我们分析了镁合金 SCC 的相关文献数据，以便为 MgGd 二元合金开发可靠的 SCC 模型。利用皮尔逊相关系数和线性拟合来描述所选参数对腐蚀和机械性能的贡献。根据我们的数据分析，获得了参数排名，提供了有关 SCC 对各种材料的极限拉伸强度 (UTS) 和断裂伸长率影响的信息。根据分析的数据，SCC敏感性可以分组并映射到Ashby类型图上，用于在空气和腐蚀性介质中测试的相应基材的UTS和伸长率。该分析揭示了第二相含量作为我们分析的材料的关键材料描述符的影响，并有助于更好地理解 Mg-5Gd 合金植入物的 SCC 模型开发。