Effects of Carbon Nanotubes and Nickel-Plated Carbon Nanotubes on the Microstructure and Mechanical Properties of AlCoCrFeNiCu High Entropy Alloy

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-04-04 DOI:10.1007/s12540-024-01639-3

Jiahao Lv, Jinghong Du, Rong Hu, Shengyang He, Jiaxing Chen, Chaoqian Qin, Zilong Wang, Yi Gou, Rongrong Zhang

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Abstract

High entropy alloys AlCoCrFeNiCuCNTs(x) and AlCoCrFeNiCu(Ni-CNTs(x) (x = 0.2 wt%, 0.5 wt%, 0.8 wt%, 1.0 wt%, 1.2 wt%) were prepared by powder metallurgy. The effects of CNTs and nickel-plated CNTs content x on the microstructure and mechanical properties of the high entropy alloys were investigated by XRD, SEM, FESEM, Raman spectrum, hardness tests and compression tests. The results showed that the dispersion of nickel-plated CNTs in the alloy powder was obviously better than that of CNTs, and a large number of agglomerates will appear when the amount of CNTs and nickel-plated CNTs were too much. The defect degree of the high entropy alloy powder with Ni-CNTs(x) was higher than that of the high entropy alloy powder with CNTs(x). The high entropy alloys blocks with CNTs and nickel-plated CNTs were both BCC + FCC two-phase solid solution structures, and the micromorphology were composed of dendritic grains. Both CNTs and nickel-plated CNTs in appropriate amount refined grains, and nickel-plated CNTs had better grains refining effect. The hardness, compressive strength and compressive plasticity of high entropy alloys blocks first increased and then decreased with the increase of CNTs and nickel-plated CNTs, and reached the best value when the content was 0.5 wt%.

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碳纳米管和镀镍碳纳米管对 AlCoCrFeNiCu 高熵合金微观结构和力学性能的影响

通过粉末冶金制备了高熵合金 AlCoCrFeNiCuCNTs(x) 和 AlCoCrFeNiCu(Ni-CNTs(x) (x = 0.2 wt%、0.5 wt%、0.8 wt%、1.0 wt%、1.2 wt%)。通过 XRD、SEM、FESEM、拉曼光谱、硬度测试和压缩试验研究了 CNTs 和镀镍 CNTs 含量 x 对高熵合金微观结构和力学性能的影响。结果表明，镀镍 CNTs 在合金粉末中的分散性明显优于 CNTs，当 CNTs 和镀镍 CNTs 的含量过多时，会出现大量团聚体。含 Ni-CNTs(x) 的高熵合金粉的缺陷度高于含 CNTs(x) 的高熵合金粉。含有 CNTs 的高熵合金块和镀镍 CNTs 均为 BCC + FCC 两相固溶体结构，微观形貌由树枝状晶粒组成。适量的 CNT 和镀镍 CNT 都能细化晶粒，其中镀镍 CNT 的细化效果更好。随着 CNTs 和镀镍 CNTs 含量的增加，高熵合金块的硬度、抗压强度和抗压塑性先增大后减小，当含量为 0.5 wt% 时达到最佳值。

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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.