Effects of Nb addition on the damping capacity and mechanical properties of NbxCoCrFeNi2Al0.3 high-entropy alloys

IF 4.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Yaqing Li, Aoxiang Li, Kaiwen Kang, Jinshan Zhang, Di Huang, Chunning Che, Borui Zhang, Saike Liu, Mingkun Xu, Yiteng Jiang, Gong Li
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Abstract

A comprehensive investigation was conducted on NbxCoCrFeNi2Al0.3 (x = 0.05, 0.10, 0.15) high-entropy alloys (HEAs), focusing on their phase evolution, microstructural characteristics, damping behavior, and mechanical properties as functions of Nb content. Microstructural analysis confirmed a dual-phase constitution in the alloy system, comprising a face-centered cubic (FCC) matrix as the primary phase with dispersed Laves phase precipitates serving as the secondary phase. As the Nb molar ratio increased from x = 0.05 to 0.15, the volume fraction of the Laves phase exhibited a significant increasing trend, rising from 1.8 vol% to 9.0 vol%. Performance tests demonstrated that the Nb0.15CoCrFeNi2Al0.3 alloy exhibited outstanding damping capacity of up to 0.055 at a strain amplitude of 3.2 × 10−4, while maintaining excellent mechanical properties. This optimized combination of damping capacity and mechanical properties enables the alloy not only to compete with conventional high-damping alloys but even to surpass them in certain key performance indicators.
Nb加入对NbxCoCrFeNi2Al0.3高熵合金阻尼性能和力学性能的影响
研究了NbxCoCrFeNi2Al0.3 (x = 0.05, 0.10, 0.15)高熵合金(HEAs)的相演化、显微组织特征、阻尼行为和力学性能随铌含量的变化规律。显微组织分析证实了合金体系的双相组成,其中面心立方(FCC)基体为初级相,分散的Laves相沉淀为次级相。随着Nb摩尔比从x = 0.05增加到0.15,Laves相的体积分数呈现出明显的增加趋势,从1.8 vol%增加到9.0 vol%。性能试验表明,在3.2 × 10−4应变幅下,Nb0.15CoCrFeNi2Al0.3合金在保持优异力学性能的同时,阻尼能力高达0.055。这种阻尼能力和机械性能的优化组合使合金不仅可以与传统的高阻尼合金竞争,而且在某些关键性能指标上甚至超过了它们。
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来源期刊
Intermetallics
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.
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