The interaction between solute atoms and matrix dislocations during plastic deformation of materials strongly influences the flow behavior and can lead to plastic instability at the macroscopic scale. In this study, Lüders band formation and dynamic strain aging phenomena were investigated in a Mg–1%Mn-1%Nd (wt.%) alloy, deformed in uniaxial tension at ambient temperature and 150 °C. The investigated alloy was studied in the initial as-extruded state and after a subsequent heat treatment at 275 °C for 120 min, which allowed for a variation of solute concentration in the microstructure, and thus for a different type/level of solute – dislocation interaction. Microstructure investigations at near-atomic resolution using three dimensional atom probe tomography were carried out in order to visualize the spatial distribution of alloying elements and reveal potential solute clustering trends in connection with the occurrence of plastic instability. Identified nanoscale solute clusters were analyzed on the basis of their size distribution, chemical composition, and statistical significance. Results demonstrate that the number, as well as the types of solute clusters, play an essential role in triggering plastic instability by interacting with deformation carriers at the atomic scale.

材料塑性变形过程中溶质原子和基体位错之间的相互作用强烈影响流动行为，并可能导致宏观尺度的塑性不稳定。在这项研究中，研究了 Mg–1%Mn-1%Nd (wt.%) 合金中的 Lüders 带形成和动态应变时效现象，该合金在环境温度和 150 °C 下单轴拉伸变形。研究的合金在最初的挤压状态下进行了研究，随后在 275°C 热处理 120 分钟，这使得微观结构中的溶质浓度发生变化，从而产生不同类型/水平的溶质 - 位错相互作用。使用三维原子探针断层扫描进行近原子分辨率的微观结构研究，以可视化合金元素的空间分布并揭示与塑性不稳定性发生相关的潜在溶质聚集趋势。根据其尺寸分布、化学成分和统计学意义分析鉴定的纳米级溶质簇。结果表明，溶质簇的数量和类型在通过与原子尺度上的变形载体相互作用来触发塑性不稳定性方面发挥着重要作用。和统计学意义。结果表明，溶质簇的数量和类型在通过与原子尺度上的变形载体相互作用来触发塑性不稳定性方面发挥着重要作用。和统计学意义。结果表明，溶质簇的数量和类型在通过与原子尺度上的变形载体相互作用来触发塑性不稳定性方面发挥着重要作用。