Exceptional tensile properties and Hall–Petch relationship in a chemically complex intermetallic alloy
摘要 化学复杂型金属间化合物的研发被认为是克服传统金属间化合物严重脆性 (尤其在高应力条件下) 的有效策略。然而, 多数化学复杂型金属间化合物的屈服强度仍难以突破1 GPa量级, 限制了其在工程领域作为结构材料的应用。本文通过设计一种新型细晶L1 2 型Ni–Co–Si–Ti–Al–B基化学复杂型金属间化合物, 成功突破此瓶颈: 该合金不仅具有 ~ 1050 MPa的优异屈服强度和 ~ 1750 MPa的极限抗拉强度, 同时实现 ~ 28%的出色拉伸延伸率。此超高屈服强度源于细晶结构及合金本身的高霍尔‐佩奇系数; 此外, 细晶内部激活的超晶格内禀层错可显著提升加工硬化能力, 晶界附近独特的无序纳米层则有效增强塑性变形协调性。本研究为开发面向先进结构应用的强韧协同型化学复杂型金属间化合物提供了新的思路。
Authors
- Yinghao Zhou (ORCID: https://orcid.org/0000-0002-5911-4841)
- Junhua Luan (ORCID: https://orcid.org/0000-0002-0736-200X)
- Jiang Ju (ORCID: https://orcid.org/0000-0002-6834-135X)
- Bo Xiao (ORCID: https://orcid.org/0000-0002-5459-4241)
- Lei Zhou (ORCID: https://orcid.org/0000-0001-9998-430X)
- Jie Gan (ORCID: https://orcid.org/0009-0001-1682-0068)
- T.H. Chou (ORCID: https://orcid.org/0000-0001-6540-9059)
- Tao Yang (ORCID: https://orcid.org/0000-0003-4355-9210)
- Weicheng Xiao (ORCID: https://orcid.org/0000-0001-9589-143X)
- Xia Li (ORCID: https://orcid.org/0000-0002-4874-3562)
- Yilu Zhao (ORCID: https://orcid.org/0000-0002-2663-6926)
Institutions
- City University of Hong Kong (HK)
- Harbin Institute of Technology (CN)
- Beijing Institute of Aeronautical Materials (CN)
- Songshan Lake Materials Laboratory (CN)
- University of Hong Kong (HK)
Publication Details
- Journal
- Rare Metals
- Published
- 2025-08-03
- DOI
- https://doi.org/10.1007/s12598-025-03516-3
- Primary Topic
- High Entropy Alloys Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- City University of Hong Kong
- National Natural Science Foundation of China
- Harbin Institute of Technology