In-situ synthesized duplex core–shell heterostructures in hypoeutectic Ni–W medium–heavy alloys: a strategy for ultrahigh strength

作者：Wannian Wang, Zhanxing Chen, Tengfei Ma, Xiaohong Wang, Gang Qin, Ruirun Chen, Guoxin Cao, Jianxin Dong · 发表于：Materials Research Letters · 年份：2025 · DOI：10.1080/21663831.2025.2479079 · 被引用次数：7 · 研究领域：High Entropy Alloys Studies、Advanced materials and composites、High Temperature Alloys and Creep

This study in-situ synthesized a duplex core–shell heterostructure in hypoeutectic Ni–W alloys, which enhanced yield strength from 637 MPa to 1989 MPa (212% increase) and achieved a substantial strain of 19.6%. This innovative core–shell heterostructure was created by alloying molybdenum (Mo) into the Ni–42W–10Co matrix. During heat treatment, the inter-dendritic regions transformed into hard ε-martensite, while the dendritic regions retained a soft austenite structure. The hard ε-martensite shell contributes significantly to high strength, while the soft austenitic core enhances plasticity. These microstructural features interact synergistically, resulting in an alloy with both superior strength and excellent plasticity.