Effects of Ta addition on microstructure, compression and wear properties of CoCrNiTax medium entropy alloys

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-09-23 DOI:10.1016/j.intermet.2025.109011

Qing Xu , Senqi Qu , Xiaojing Xu , Chenglong Zhao , Cheng Ai , Yi Ru , Heng Zhang , Shusuo Li , Shengkai Gong , Min Guo , Taiwen Huang , Lin Liu

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引用次数: 0

Abstract

Effect of Ta content on microstructure and mechanical properties of CoCrNiTa_x medium entropy alloys (x = 0.1–0.5) was discussed. With increasing Ta content, CoCrNiTa_x alloys changed from hypoeutectic (x = 0.1, 0.3) to eutectic (x = 0.35) and to hypereutectic (x = 0.4, 0.5) alloys, and CoCrNiTa_x alloys were all composed by γ phase and C14-type Laves phase. Meanwhile, microhardness of CoCrNiTa_x alloys increased with increasing Ta content. With increasing Ta content, compressive strengths of CoCrNiTa_x alloys firstly increased and then decreased, and CoCrNiTa_0.35 alloy had the highest compression strength (2852 MPa). Nanohardness of primary γ phase was much lower than that of primary Laves phase, and nanohardness of eutectic phases firstly increased and then decreased with increasing Ta content. In addition, nanohardness of γ phase in CoCrNiTa_x alloy was higher than that of γ phase in CoCrFeNiTa_x alloy, which provided a notable contribution to compression strengths of CoCrNiTa_x alloys. Wear mechanism gradually changed from adhesive wear to abrasive wear with increasing Ta content, and CoCrNiTa_0.5 alloy exhibited the highest wear resistance.

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添加Ta对CoCrNiTax中熵合金组织、压缩和磨损性能的影响

讨论了Ta含量对CoCrNiTax中熵合金（x = 0.1 ~ 0.5）显微组织和力学性能的影响。随着Ta含量的增加，CoCrNiTax合金由亚共晶（x = 0.1, 0.3）转变为共晶（x = 0.35）和过共晶（x = 0.4, 0.5）合金，且均由γ相和c14型Laves相组成。同时，CoCrNiTax合金的显微硬度随Ta含量的增加而增加。随着Ta含量的增加，CoCrNiTax合金的抗压强度先升高后降低，其中CoCrNiTa0.35合金的抗压强度最高（2852 MPa）。初生γ相的纳米硬度远低于初生Laves相，共晶相的纳米硬度随Ta含量的增加先升高后降低。此外，CoCrNiTax合金中γ相的纳米硬度高于CoCrFeNiTax合金中γ相的纳米硬度，这对CoCrNiTax合金的抗压强度有显著贡献。随着Ta含量的增加，磨损机制由黏着磨损逐渐转变为磨粒磨损，CoCrNiTa0.5合金的耐磨性最高。

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.