Excellent ductilization and strengthening of lightweight refractory high‐entropy alloys via stable B2 nanoprecipitates
概要 引入B2有序结构可以有效提高轻质难熔高熵合金的力学性能. 然而, (Zr,Al)富集的B2析出物通常会降低其塑性, 因为它们的有序特征会在位错通过后被破坏. 同时, 局部化学有序结构(LCOs)由于体积小, 往往不能提供足够的强化效果. 为解决这些问题, 本研究将Al添加到TiVNb合金中, 生成稳定的B2纳米析出物. 这种B2纳米析出物对成分变化有较大的容忍性, 可以牢固且连续地钉扎位错, 激活位错多滑移系, 促进位错增殖. 因此, TiVNbAl0.4轻质难熔高熵合金的屈服强度和断裂延伸率可分别增加35%和60%, 强化效果远高于其他已报道的B2有序结构. 同时, 实现了比屈服强度和断裂延伸率之间良好的协同作用(170±1 MPa·cm3·g‐1和32.40%±0.4%), 优于大多数轻质难熔高熵合金. 本文为优化轻质难熔高熵合金力学性能提供了一种有效范例.
Authors
- Yu Tang (ORCID: https://orcid.org/0000-0002-2465-256X)
- Yuanlin Ai
- Qian Yu (ORCID: https://orcid.org/0000-0003-3612-6951)
- Wenai Shen (ORCID: https://orcid.org/0000-0001-9939-1854)
- Shuxin Bai (ORCID: https://orcid.org/0000-0003-2273-7479)
- Shun Li (ORCID: https://orcid.org/0000-0002-9191-8540)
- Yujie Chen (ORCID: https://orcid.org/0000-0003-2513-7559)
- Ruixin Wang (ORCID: https://orcid.org/0000-0003-0999-9255)
Institutions
- National University of Defense Technology (CN)
- Zhejiang University (CN)
Publication Details
- Journal
- Rare Metals
- Published
- 2024-11-02
- DOI
- https://doi.org/10.1007/s12598-024-03032-w
- Citations
- 10
- Primary Topic
- High Entropy Alloys Studies
- Type
- article
- Field-Weighted Citation Impact
- 2.13
Funders
- National Natural Science Foundation of China
- Natural Science Foundation of Hainan Province