Achieving superior strength–ductility synergy in refractory high entropy alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-04-22 DOI:10.1016/j.intermet.2025.108794

Mingjun Qiu , Ping Huang , Chao Gu , Fei Wang

引用次数: 0

Abstract

In contrast to the successful realization of strength-ductility synergy through local chemical ordering (LCO) in FCC systems, achieving similar effects in BCC structures remains challenging. The complex core structure of BCC dislocations leads to an opposite hindrance effect of LCO on screw dislocations compared to FCC systems, necessitating compositional design to optimize LCO distribution and morphology. Guided by the negative enthalpy alloy design philosophy, this study introduces high-density LCO in the V950 alloy. By modulating the synergistic interaction between LCO and texture, the alloy achieves exceptional mechanical properties, including ultrahigh yield strength (∼960 MPa), ultimate tensile strength (1159 MPa), and fracture elongation (∼27.5 %), surpassing most reported refractory high-entropy alloys (RHEAs). Furthermore, this work elucidates novel mechanisms of work hardening behavior in BCC-structured alloys, advancing fundamental understanding and design strategies for high-performance BCC systems.

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在难熔高熵合金中实现优异的强度-延性协同

与FCC系统中通过局部化学有序（LCO）成功实现强度-延性协同相比，在BCC结构中实现类似的效果仍然具有挑战性。BCC位错复杂的核心结构导致LCO对螺杆位错的阻碍作用与FCC体系相反，因此需要通过成分设计来优化LCO的分布和形态。本研究以负焓合金设计理念为指导，在V950合金中引入高密度LCO。通过调节LCO和织构之间的协同作用，该合金获得了卓越的机械性能，包括超高屈服强度（~ 960 MPa）、极限抗拉强度（1159 MPa）和断裂伸长率（~ 27.5%），超过了大多数报道的耐火高熵合金（RHEAs）。此外，这项工作阐明了BCC结构合金加工硬化行为的新机制，促进了对高性能BCC系统的基本理解和设计策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.