本团队龚攀副教授、硕士生张嘉琪等在Journal of Alloys and Compounds发表研究论文。

摘要：This investigation introduced an elasto-static loading (ESL) strategy that leveraged the rejuvenation effect of the metallic glass matrix and the transformation toughening of the crystalline phase, thereby enhancing the strength and ductility of Zr-based metallic glass composites reinforced with TiNi particles synthesized through spark plasma sintering. Composites samples with varying volume fractions of TiNi particles underwent 12 hours of static compression loading at 90 % of their yield strength, and a systematic investigation was conducted to study the microstructural and mechanical property alterations induced by ESL. The findings revealed that ESL not only imparted a rejuvenation effect on the metallic glass matrix but also triggered martensitic phase transformation strengthening in the TiNi particles. This effectively enhanced the room-temperature compressive ductility of the composites with 20 vol% and 30 vol% TiNi, with the increase exceeding 50 %, while also improving their strength. Nonetheless, an increase in the volume fraction of TiNi particles resulted in higher internal porosity and a rising number of weakly bonded interfaces within the composites, which diminished the ductility enhancement effects of ESL. With the application of elastic stress, the augmentation of free volume within the metallic glass matrix facilitated the nucleation of shear bands. Moreover, the crystalline second phase, strengthened by phase transformation, not only bolstered the strength of composite but also exerted a stronger resistance to shear bands propagation, consequently enhancing ductility.