Abstract The local atomic structure of an Mg-1.44Nd (wt.%) alloy was investigated after solution annealing, high-pressure torsion (HPT) processing up to 1 and 10 turns and ageing at 250 °C for 5 h using X-ray absorption fine structure (XAFS) measurements at the Nd LIII-edge. The results show that HPT processing has no effect on the atomic structure around Nd atoms compared to the unprocessed state, whereas ageing at 250 °C for 5 h induces a significant modification in the coordination number and interatomic distances around the Nd atoms. These variations are analyzed based on the correlations between precipitation, defects and atomic mobility of the chemical species.

中文翻译：

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EXAFS对高压扭转和时效处理后Mg-Nd合金局部原子结构的研究

摘要 Mg-1.44Nd (wt.%) 合金在固溶退火、高压扭转 (HPT) 加工达 1 圈和 10 圈后，使用 X 射线在 250 °C 下时效 5 h 后的局部原子结构进行了研究。 Nd LIII 边缘的吸收精细结构 (XAFS) 测量。结果表明，与未处理状态相比，HPT 处理对 Nd 原子周围的原子结构没有影响，而在 250°C 下老化 5 小时会导致 Nd 原子周围的配位数和原子间距离发生显着变化。这些变化基于化学物质的沉淀、缺陷和原子迁移率之间的相关性进行分析。