Microstructure, mechanical properties, wear, and corrosion resistance of as-cast VZrTa0.5Tix refractory medium-entropy alloys

IF 5.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2026-04-01 Epub Date: 2026-01-23 DOI:10.1016/j.intermet.2026.109175

Peihao zhang , Xinmei Li , Aixiang Zhang , Liping Wu , Yangxuan Xie

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引用次数: 0

Abstract

This study fabricated a series of VZrTa_0.5Ti_x (molar ratio, x = 0.25, 0.5, 0.75, 1, 1.25) refractory medium-entropy alloys (RMEAs) using vacuum arc melting technology. It systematically investigated the comprehensive effects of Titanium content variation on the alloys' microstructure, mechanical properties, wear resistance, and electrochemical corrosion behaviors. Microstructural analysis reveals that while the addition of Ti effectively suppresses the precipitation of brittle intermetallic compound (IMC) phases, excessive Ti promotes the formation of Ti₃V IMC phases. Consequently, as Ti content increases, hardness initially decreases before rising to a maximum of 549.5 HV in the Ti1.25 composition, whereas plasticity shows an inverse trend. Notably, the Ti0.25 alloy exhibits the highest yield strength of 2108.2 MPa, while the Ti1 alloy achieves optimal plasticity at 18.3 %. Room temperature dry wear tests showed that the Ti1.25 alloy possesses the lowest friction coefficient (0.473) and wear rate (2.9 × 10⁻⁴ mm³/N·m). Furthermore, electrochemical tests in 3.5 % NaCl solution establish that the Ti1 alloy displays superior corrosion resistance. Ultimately, the Ti1 alloy offers a balance of plasticity and corrosion resistance, while Ti1.25 excels in strength and wear resistance, indicating significant engineering potential.

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铸态VZrTa0.5Tix难熔中熵合金的组织、力学性能、磨损及耐蚀性

采用真空电弧熔炼技术制备了一系列VZrTa0.5Tix（摩尔比，x = 0.25, 0.5, 0.75, 1,1.25）耐火中熵合金（RMEAs）。系统研究了钛含量变化对合金显微组织、力学性能、耐磨性和电化学腐蚀行为的综合影响。显微组织分析表明，Ti的加入有效抑制了脆性金属间化合物（IMC）相的析出，而过量的Ti则促进了Ti3V IMC相的形成。因此，随着Ti含量的增加，Ti1.25组分的硬度先下降后上升到最大值549.5 HV，而塑性呈相反趋势。其中，Ti0.25合金屈服强度最高，为2108.2 MPa，而Ti1合金塑性最佳，为18.3%。室温干磨损试验表明，Ti1.25合金具有最低的摩擦系数（0.473）和磨损率（2.9 × 10−4 mm3/N·m）。此外，在3.5% NaCl溶液中的电化学试验表明，Ti1合金具有优异的耐蚀性。最终，Ti1合金提供了塑性和耐腐蚀性的平衡，而Ti1.25合金在强度和耐磨性方面表现出色，显示出巨大的工程潜力。

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.