Microstructure and strengthening mechanism of non-equiatomic AlCoCrFeNi high entropy alloy via Ta alloying

IF 5.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-05 DOI:10.1016/j.intermet.2025.109114

Tong Liu , Dezhi Chen , Xuefeng Gao , Gang Qin , Ruirun Chen

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引用次数: 0

Abstract

To reveal the effect of Ta on non-equiatomic AlCoCrFeNi high entropy alloys (HEAs), Ni_42-xCo₃₀Cr₁₁Fe₁₁Al₆Ta_x (x = 0, 1.5, 3, 4.5, 6 at.%) HEAs were prepared. The microstructure evolution, mechanical properties and strengthening mechanism of the alloys were studied. The results show that the Ta element promotes the formation of L1₂ phases and Laves phases in matrix. The microstructure of the alloy changes from the single face-centered body (FCC) phases (x = 0) to the FCC + L1₂ phases (x˂3 at.%), and ultimately to FCC + L1₂+Laves phases (x ≥ 3 at.%). The tensile yield strength, ultimate tensile strength and elongation of the Ni₃₆Co₃₀Cr₁₁Fe₁₁Al₆Ta₆ alloy are 1065 MPa, 1250 MPa and 9.6 %, respectively. The alloy demonstrated fivefold higher yield strength than the Ta-free alloy, outperforming most cast alloys. The precipitation strengthening shows the higher contribution in the alloy. It provides a demonstration for designing high-strength as-cast HEAs.

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非等原子AlCoCrFeNi高熵合金Ta合金化组织及强化机理

为了揭示Ta对非等原子AlCoCrFeNi高熵合金（HEAs）的影响，采用Ni42-xCo30Cr11Fe11Al6Tax (x = 0,1.5, 3,4.5, 6 at。%)制备HEAs。研究了合金的组织演变、力学性能和强化机理。结果表明，Ta元素促进了基体中L12相和Laves相的形成。合金的显微组织由单面心体（FCC）相（x = 0）转变为FCC + L12相（x小于3 at）。%)，最终到FCC + L12+Laves相（x≥3at .%）。Ni36Co30Cr11Fe11Al6Ta6合金的抗拉屈服强度、极限抗拉强度和延伸率分别为1065 MPa、1250 MPa和9.6%。该合金的屈服强度比不含ta的合金高5倍，优于大多数铸造合金。析出强化对合金的贡献较大。为高强度铸态HEAs的设计提供了理论依据。

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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.