Additively manufactured fine-grained high-performance W-20 wt%Cu composites: Microstructure evolution and mechanical properties

作者：Jie Mao, Nan Ye, Wentan Zhu, Jiancheng Tang, Zichun Wu, Haiou Zhuo, Г. А. Баглюк · 发表于：Materials Science and Engineering A · 年份：2025 · DOI：10.1016/j.msea.2025.147913 · 被引用次数：10 · 研究领域：Advanced materials and composites、High Entropy Alloys Studies、Metal and Thin Film Mechanics

In W-Cu composites, excellent mechanical and physical properties are typically mutually exclusive, presenting challenges in attaining superior overall performance. In this work, spherical W-Cu composite powders with high dispersibility and density were synthesized successfully via powder structure and morphology customization . The fine-grained W-20 wt%Cu composites with outstanding comprehensive properties through laser directed energy deposition (L-DED) technique were fabricated and the underlying mechanism of their microstructure evolution , mechanical and physical properties were revealed in detail. Herein, the prepared W-20Cu composites demonstrated improved hardness, tensile strength , thermal and electrical conductivity relative to existing literature. Specifically, the fine-grained W-20Cu composite produced at 1200 W showed a tensile strength over 500 MPa, a hardness of 261 HV, a thermal conductivity of 215.35 W/mK and an electrical conductivity of 37.93 % IACS, respectively. The strengthening mechanisms of the presented W-20Cu composites were discussed in terms of fine-grained strengthening, dispersion strengthening and a large number of sub-grains in the Cu phase. This work provides fundamental insight into developing and fabricating W-Cu composite materials with excellent comprehensive properties for demanding structural applications.