Mechanical Properties and Microstructural Evolution of CuZn Alloys via Pre-Torsional Deformation

Mechanical properties and microstructural evolution of Cu-10wt.%Zn and Cu-30wt.%Zn alloys after pre-torsional deformation have been investigated in this study. The results indicated that pre-torsional deformation can significantly enhance the strength of both Cu-10wt.%Zn and Cu-30wt.%Zn alloys without changing their shape and size, but with the sacrifice of the ductility. The pre-torsion deformation can introduce gradient hardness and microstructures along the radial direction, with the microstructures along the radial direction in Cu-30wt.%Zn alloy being "dislocations→stacking faults→twins (low density)". The stacking fault energy affects significantly the microstructure along the radial direction.

本研究针对预扭转变形后的铜-10wt.%锌合金（Cu-10wt.%Zn）与铜-30wt.%锌合金（Cu-30wt.%Zn）的力学性能及微观组织演变展开了探究。研究结果表明，预扭转变形可在不改变合金外形与尺寸的前提下，显著提升两种铜锌合金的强度，但会以牺牲塑性为代价。预扭转变形可沿径向方向引入梯度硬度与微观组织；其中铜-30wt.%锌合金的径向微观组织为“位错→层错→（低密度）孪晶”。层错能对合金的径向微观组织具有显著影响。