Enhanced torsional strength and plasticity synergy of multi-component alloy via multi-level gradient structures

This study investigates an approach to enhance the strength and torsional angle, as well as analyze the microstructure and mechanical properties of a multi-component Cu-based alloy. A unique gradient-structured alloy is successfully synthesized by subjecting CuAl10Fe5Ni4Mn0.23 to high-frequency large torsional deformation. The results showed that the multi-level gradient structure due to high-frequency deformation significantly enhances the torsional strength of CuAl10Fe5Ni4Mn0.23 alloy. With a torsional rate of 120 degrees/min and a maximum torsional angle achieved at 40 degrees, after 200 cycles, compared to non-torsional samples, the torsional strength increased by 75.69 % and the torsion angle also increased by 38.36 %. The combination of the alloy primary structures along with gradient structures forms a new microband structure that synergistically improves the mechanical properties of multi-component alloys. The proposed large torsion deformation alters the structure of multi-component alloys, resulting in a gradient structure that simultaneously enhances both strength and plasticity, resolving current reciprocal dilemmas between these two factors.