发表机构
UCLouvain; Université Sorbonne Paris Nord; Chimie ParisTech, Institut de Recherche de Chimie Paris; Aix-Marseille Université; NanoMegas SPRL; WEL Research Institute（瓦隆天主教大学; 索邦巴黎北大学; 巴黎化学学院，巴黎化学研究院; 艾克斯-马赛大学; 纳米兆斯有限公司; WEL研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究发现塑性变形可在室温下驱动纳米晶CuZr合金的非晶相变，该机制同时将屈服强度、断裂应变和拉伸韧性提升约两倍，为纳米金属损伤容限增强提供了非热路径。
AI 中文摘要
晶界工程是调控多晶材料力学性能的主要途径。晶界相（包括非晶晶间薄膜）通常通过热驱动力和溶质偏析来获得。在此，我们发现塑性变形可以在室温下驱动化学预处理的纳米晶二元CuZr合金中发生非晶相变。高分辨率和四维扫描透射电子显微镜揭示，非晶相优先出现在非共格孪晶界处。原子尺度的空间分辨电子对分布函数分析（对非晶相的局域有序性表征）展示了从晶体模板界面到金属玻璃状核心的短程和中程有序梯度。因此，我们揭示了一种新颖的非晶相变诱导塑性机制，与设计的参考材料相比，该机制同时将屈服强度、断裂应变和拉伸韧性提高了约两倍。我们的发现确立了机械变形作为一种非热途径，可触发非晶界面态，以增强纳米结构金属的损伤容限。
英文摘要
Grain boundary engineering is a major avenue for tailoring the mechanical behavior of polycrystalline materials. Grain boundary complexions, including amorphous intergranular films, are classically accessed through thermal driving forces and solute segregation. Here, we discover that plastic deformation can drive amorphous complexion transitions at room temperature in a chemically primed nanocrystalline binary CuZr alloy. High-resolution and four-dimensional scanning transmission electron microscopy reveal that the amorphous complexions preferentially emerge at incoherent twin boundaries. Spatially-resolved electron pair distribution function analysis at the atomic scale, the local-order characterization of amorphous complexions, demonstrates short-range and medium-range order gradients from crystal-templated interfaces to a metallic-glass-like core. We thus uncover a novel amorphous complexion transformation-induced plasticity mechanism that concurrently increases the yield strength, fracture strain, and tensile toughness about a factor of two relative to a designed reference material. Our findings establish mechanical deformation as a non-thermal pathway to trigger amorphous interfacial states for enhancing damage tolerance in nanostructured metals.
