In-situ formation of Ni3Ta nanophase for strengthening tungsten alloy

作者：Yao Wang, Yufeng Huang, Wensheng Liu, Baishan Chen, Jiayi Liu, Lei Zhang, Yong Zhang, Yunzhu Ma · 发表于：Journal of Alloys and Compounds · 年份：2023 · DOI：10.1016/j.jallcom.2023.168927 · 被引用次数：30 · 研究领域：Advanced materials and composites、High Entropy Alloys Studies、Intermetallics and Advanced Alloy Properties

Tungsten alloys are typical tungsten-based composites that consists of tungsten particles and a matrix phase , and they have been widely used in national defense and military industries. However, the low strength of the matrix is the "Achilles’ heel" of tungsten alloys; specifically, it limits the further use of the alloys. In this work, a nano-Ni 3 Ta phase-reinforced ultrafine-grain tungsten alloy was fabricated via low-temperature sintering. A coherent interface with an excellent interfacial bonding strength was formed between the Ni 3 Ta and the matrix phase. The average grain size of the alloy was only 6.83 µm, which is significantly smaller than that of the alloy without added Ta (90 W-4.9Ni-2.1Fe-3Cu alloy, 18.06 µm) and traditional tungsten alloy (∼30 µm). The ultimate tensile strength (UTS) and total elongation (TE) of the alloy were 1139.74 MPa and 14.77 %, respectively. The excellent mechanical properties can be attributed to a synergistic effect between nanoscale Ni 3 Ta phase dispersion and fine-grain strengthening. These findings indicate that our approach is a novel way to develop new tungsten alloys that have high strength and toughness.