Surface mechanical attrition treatment (SMAT) was employed to produce gradient structures in AZ31B Mg alloy samples with two different initial textures. The structure of both samples can be regarded as an integration of two main layers: the severely deformed layer exhibited dramatic grain refinement to nano- and submicron-scale with weakened and randomized textures; the less deformed layer exhibited the inherited coarse grains with increased dislocation density, possessing the similar texture with the sample prior to SMAT. All the samples containing different layer constituents cut from the SMAT alloys showed remarkable increase of strength compared to the original Mg alloy. However, the two integral SMAT samples with different initial textures exhibited marked difference in uniform elongation (UE) during tension. That was attributed to the different strain hardening behaviors influenced by the deformation coordination and strain partitioning between layers with different orientation relationships. The 0° oriented SMAT sample showed no macroscopic strain transfer or slip transmission across layers, which was hard to cause dislocation accumulation throughout the whole thickness of the layered sample. That resulted in a limited strain hardening and UE. However, the favored orientation relationship between layers of the 45° oriented SMAT sample facilitated the strain transfer and slip continuity across the layers. That generated a dynamically migrating interface during tension, which allowed the dislocations accumulating over the whole sample volume. This caused a pronounced strain hardening and sustained UE to an appreciable value.

采用表面机械磨损处理（SMAT）在具有两种不同初始织构的AZ31B镁合金样品中产生梯度结构。两种样品的结构都可以看作是两个主要层的结合：严重变形的层表现出明显的晶粒细化，细化到纳米和亚微米级，并且具有弱化和随机化的组织；变形较少的层表现出具有增加的位错密度的遗传粗晶粒，与SMAT之前的样品具有相似的质地。与原始Mg合金相比，所有由SMAT合金切割而成的包含不同层成分的样品均显示出明显的强度提高。但是，具有不同初始纹理的两个完整SMAT样本在拉伸过程中的均匀伸长率（UE）表现出显着差异。这归因于具有不同取向关系的层之间的变形协调和应变分配影响了不同的应变硬化行为。取向为0°的SMAT样品在层间没有宏观应变传递或滑动传递，这很难在层状样品的整个厚度上引起位错累积。这导致有限的应变硬化和UE。但是，45°取向SMAT样品的层之间有利的取向关系促进了层间的应变传递和滑动连续性。这在拉伸过程中产生了动态迁移的界面，从而使位错累积在整个样品体积中。这引起了明显的应变硬化，并使UE维持在可观的水平。