Environment dependent Ta-Mo synergy toward eutectic high-entropy alloys with strength and tunable corrosion resistance

IF 5.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI:10.1016/j.intermet.2026.109180

Jiajun Yuan , Zengmin Shi , Lei Dai , Xicong Ye , Long Xu , Junwen Gao , Panxing Liu

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引用次数: 0

Abstract

Conventional alloy design often targets a single universally optimal composition. This paradigm is challenged by a ‘threat-matched’ synergistic alloying strategy in (CoCrFeNi)₈₅Ta_xMo_15-x eutectic high-entropy alloys (EHEAs), prepared by vacuum arc melting, enabling remarkable environment-specific performance. Systematic tuning of the Ta/Mo ratio yields a eutectic (CoCrFeNi)₈₅Ta₅Mo₁₀ alloy with exceptional properties of ∼1.7 GPa yield strength and 31.7 % fracture strain. Notably, corrosion resistance shifts with environment. In 0.6 M NaCl, a high-Ta alloy (TM10-5) offers a superior protection via a robust Ta₂O₅ barrier; in aggressive 0.6 M NH₄Cl, the optimal composition shifts to a balanced Ta/Mo ratio (TM7.5–7.5). This adaptability stems from a dynamic interplay where Mo's chemical stabilization is amplified to counter NH₄Cl's complex acidic and ion-complexing attack. This study validates a pathway for designing advanced EHEAs, where tailored synergistic alloying counters specific environmental threats, boosting reliability for demanding applications.

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环境依赖Ta-Mo协同作用对高熵共晶合金的强度和可调耐蚀性

传统的合金设计通常以单一的普遍最佳成分为目标。这种模式受到了（CoCrFeNi）85TaxMo15-x共晶高熵合金（EHEAs）的“威胁匹配”协同合金化策略的挑战，该合金通过真空电弧熔化制备，具有卓越的环境特定性能。系统调整Ta/Mo比可得到一种共晶（CoCrFeNi）85Ta5Mo10合金，其屈服强度为~ 1.7 GPa，断裂应变为31.7%。值得注意的是，耐腐蚀性随环境变化而变化。在0.6 M NaCl中，高ta合金（TM10-5）通过强大的Ta2O5屏障提供卓越的保护；在侵略性为0.6 M的NH4Cl中，最佳组成转变为平衡的Ta/Mo比（TM7.5-7.5）。这种适应性源于一种动态的相互作用，其中Mo的化学稳定性被放大以对抗NH4Cl的复杂酸性和离子络合攻击。该研究验证了设计先进EHEAs的途径，其中定制的协同合金可以应对特定的环境威胁，提高高要求应用的可靠性。

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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.