Microstructure and Friction Properties of TiB2@Ti/CoCrFeNi High Entropy Alloy Matrix Composite

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-08-03 DOI:10.1007/s12540-024-01742-5

Bo Ren, Xiao-Fan Zhang, Rui-Feng Zhao, Hong-Song Zhang

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Abstract

TiB₂@Ti/CoCrFeNi high-entropy alloy matrix composite (HEAMC) powders and bulk materials were prepared by mechanical alloying and spark plasma sintering. The microstructure of the powders was characterized, and the microstructure, hardness, and friction properties of the bulk materials were investigated. Results showed that after low-energy ball milling for 8 h, the composite powder presented an ellipsoidal or granular shape with an average particle size of approximately 80 µm. The phase structure was mainly composed of FCC, Ti, and TiB₂ phases. The phase structure of the sintered composite was mainly composed of FCC and a small amount of TiB₂ phases. The microhardness of the composite was 362 HV, which was approximately 188 HV higher than that of the matrix alloy. The average friction coefficient was approximately 0.6664, which was 0.087 lower than that of the matrix alloy. The improvement in the hardness and friction performance of the composite was mainly attributed to the strengthening of grain boundary caused by the enrichment of TiB₂ particles and Cr₂O₃ along the grain boundary and the solid solution strengthening of Ti. The wear types were mainly abrasive and oxidative wear for the composite and CoCrFeNi matrix alloy.

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TiB2@Ti/CoCrFeNi 高熵合金基复合材料的显微结构和摩擦性能

通过机械合金化和火花等离子烧结制备了 TiB2@Ti/CoCrFeNi 高熵合金基复合材料（HEAMC）粉末和块体材料。对粉末的微观结构进行了表征，并研究了块体材料的微观结构、硬度和摩擦性能。结果表明，低能球磨 8 小时后，复合粉末呈椭圆形或颗粒状，平均粒径约为 80 µm。相结构主要由 FCC、Ti 和 TiB2 相组成。烧结复合材料的相结构主要由 FCC 相和少量 TiB2 相组成。复合材料的显微硬度为 362 HV，比基体合金高出约 188 HV。平均摩擦系数约为 0.6664，比基体合金低 0.087。复合材料硬度和摩擦性能的提高主要归因于沿晶界富集的 TiB2 颗粒和 Cr2O3 对晶界的强化以及 Ti 的固溶强化。复合材料和 CoCrFeNi 基合金的磨损类型主要是磨料磨损和氧化磨损。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.