High-temperature dynamic mechanical properties of V0.5Nb0.5ZrTi refractory high entropy alloy fabricated by multi-wire arc additive manufacturing

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-10-19 DOI:10.1016/j.ijrmhm.2025.107506

Xinglong Di , Haozhe Xu , Chan Wang , Yujing Zhou , Siyi Peng , Xiebin Wang , Changmeng Liu , Yueling Guo

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引用次数: 0

Abstract

Refractory high entropy alloys (RHEAs) are a promising class of alloys with superior high-temperature mechanical properties Multi-wire arc additive manufacturing (MWAAM) offers a cost-effective and highly efficient route for fabricating RHEAs. However, research on the high-temperature and dynamic mechanical behavior of MWAAM-produced RHEAs remains unreported. In this study, a V_0.5Nb_0.5ZrTi RHEA was successfully fabricated using MWAAM. The microstructure, as well as the static and dynamic mechanical properties of the alloy at various temperatures, were systematically investigated. The results show that the deposited V_0.5Nb_0.5ZrTi RHEA is free of cracks and defects, and it exhibits a multiphase microstructure, which is beneficial for overcoming the strain softening commonly observed in BCC-structured high-entropy alloys during dynamic loading. The alloy exhibits excellent strength and plasticity under dynamic compression, with the strength improved by 2.5 %–36.6 % compared to the commonly used Ni-based superalloys and a RHEA with similar composition. Moreover, both the yield strength and plastic strain of the V_0.5Nb_0.5ZrTi RHEA increase with rising strain rate, showing a synergistic improvement in strength and ductility. This study provides valuable data and insights for the development and manufacturing of high-performance, low-cost, ductile V_0.5Nb_0.5ZrTi RHEA.

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多丝电弧增材制造V0.5Nb0.5ZrTi耐火高熵合金的高温动态力学性能

难熔高熵合金（RHEAs）是一类具有优异高温力学性能的极具发展前景的合金。然而，关于mwaam制备的RHEAs的高温和动态力学行为的研究尚未见报道。在本研究中，利用MWAAM成功制备了V0.5Nb0.5ZrTi RHEA。系统地研究了该合金在不同温度下的显微组织和静态、动态力学性能。结果表明：沉积的V0.5Nb0.5ZrTi RHEA无裂纹和缺陷，呈现多相组织，有利于克服bcc组织高熵合金在动加载过程中常见的应变软化现象；该合金在动态压缩条件下表现出优异的强度和塑性，与常用的镍基高温合金和成分相似的RHEA相比，强度提高了2.5% ~ 36.6%。随着应变速率的升高，V0.5Nb0.5ZrTi RHEA的屈服强度和塑性应变均增加，表现出强度和塑性的协同提高。该研究为高性能、低成本、延展性的V0.5Nb0.5ZrTi RHEA的开发和制造提供了有价值的数据和见解。

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

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.