论文标题
通过晶粒细化和晶界隔离实现高强化的Al-Cu-mg合金
Achieving highly strengthened Al-Cu-Mg alloy by grain refinement and grain boundary segregation
论文作者
论文摘要
通过高压扭转（HPT）来处理可添加年龄的Al-Cu-mg合金（A2024），用于产生超铁粒结构。合金进一步陈化了额外的增强。然后，拉伸强度达到高达约1 GPA的值。通过透射电子显微镜和原子探针断层扫描分析显微结构。高强度的机制在固定溶剂硬化，簇硬化，工作硬化，分散硬化和晶界硬化方面得到了阐明。结果表明，包括亚晶边界在内的晶界处的溶质隔离对于增强拉伸强度起着重要作用。
An age-hardenable Al-Cu-Mg alloy (A2024) was processed by high-pressure torsion (HPT) for producing an ultrafine-grained structure. The alloy was further aged for extra strengthening. The tensile strength then reached a value as high as ~1 GPa. The microstructures were analyzed by transmission electron microscopy and atom probe tomography. The mechanism for the high strength was clarified in terms of solid-solution hardening, cluster hardening, work hardening, dispersion hardening and grain boundary hardening. It is shown that the segregation of solute atoms at grain boundaries including subgrain boundaries plays a significant role for the enhancement of the tensile strength.
