Effects of Al addition on microstructure and mechanical properties of a novel FeNi2VAlx high-entropy alloy system

IF 7 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiaoya Liu , Yongkang Zhou , Jingqian Chen , Huameng Fu , Haifeng Zhang , Yingjie Ma , Zhengwang Zhu
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Abstract

Multi-phase high-entropy alloys (HEAs) exhibiting an exceptional strength-ductility synergy represent a novel paradigm in advanced alloy design. In this study, a series of FeNi2VAlx (x = 0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1) HEAs were designed and fabricated, and the effects of Al addition on the phase formation and mechanical properties were systematically investigated. With Al content increasing, the phase constitution in this alloy system evolves from a single face-centered cubic (FCC) phase to a mixture of FCC and L21 phase – an ordered body-centered cubic (BCC) derived phase, and finally to a single L21 phase. There is a localized short-range ordered L12 structure in the FCC phase in the alloys with high Al concentration, and the L21 phase in this series of alloys exhibits antiphase domains (APDs) structure, confirming its long-range periodicity. The increasing Al addition leads to the improvement of the strength of the alloys, yield strength from 303 to 1115 MPa, and ultimate tensile strength from 565 to 1407 MPa. The Al0.6 alloy achieves an excellent strength-ductility balance (761 MPa yield strength, 1194 MPa ultimate tensile strength, and 21.2 % elongation) due to the following combined strategy: synergistic FCC/L21 phase deformation, Taylor lattices, high-density dislocation walls, and FCC stacking faults, which collectively optimize strain hardening and dislocation restriction. This study provides essential insights into the strategic design of multi-phase HEA structures, enabling the achievement of an extraordinary strength-ductility synergy.
Al添加对新型FeNi2VAlx高熵合金体系组织和力学性能的影响
多相高熵合金(HEAs)表现出优异的强度-延展性协同作用,代表了先进合金设计的新范式。本研究设计并制备了一系列FeNi2VAlx (x = 0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1) HEAs,并系统研究了Al添加对其相形成和力学性能的影响。随着Al含量的增加,该合金体系的相组成由单一的面心立方相(FCC)发展为FCC与L21相的混合相——有序的体心立方相(BCC)衍生相,最后发展为单一的L21相。在高Al浓度合金中,FCC相中存在局域的短程有序L12结构,而L21相中存在反相畴(APDs)结构,证实了其长期周期性。随着Al添加量的增加,合金的屈服强度从303提高到1115 MPa,极限抗拉强度从565提高到1407 MPa。由于FCC/L21相的协同变形、Taylor晶格、高密度位错壁和FCC层错共同优化了应变硬化和位错限制,Al0.6合金获得了良好的强度-塑性平衡(屈服强度761 MPa,极限抗拉强度1194 MPa,伸长率21.2%)。本研究为多相HEA结构的战略设计提供了重要的见解,使其能够实现非凡的强度-延性协同作用。
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来源期刊
Materials Science and Engineering: A
Materials Science and Engineering: A 工程技术-材料科学:综合
CiteScore
11.50
自引率
15.60%
发文量
1811
审稿时长
31 days
期刊介绍: Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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