Effect of Nb on Microstructure and Wear Property of Laser Cladding CoCrFeNiTiNbx High-Entropy Alloys Coatings

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-06-29 DOI:10.1007/s12540-024-01720-x

Lin Ding, Hongxin Wang, Quan Xiumin

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Abstract

A group of CoCrFeNiTiNb_x high entropy alloys (HEAs) coatings were produced by laser cladding. The effect of Nb content on the microstructure and wear resistance of the HEAs coatings was investigated. The results indicated that adding Nb promoted the phase transition from BCC to FCC and the formation of Fe₂Nb Laves phase, The diffraction peaks of FCC and BCC phases were firstly shifted to smaller angle as Nb content was increased, and then shifted to larger angle. Adding Nb promoted brittle fracture of more coarse dendrites to formed fine dendrites and equiaxed crystals homogenizing the microstructure in the HEAs coatings, as well as the formation of dense dislocations and dislocation interaction. The microhardness of the HEAs coatings was firstly increased and then decreased as Nb content was increased, and the change of the mass loss and friction coefficient was opposite trend. Compared with CoCrFeNiTiNb_0.0 HEAs coatings, the microhardness of the CoCrFeNiTiNb_1.0 HEAs coatings was improved by 25.00%, the mass loss was reduced by 28.27%, and and friction coefficient was the lowest. The wear mechanism of the HEAs coatings was transformed from the adhesive wear and oxidative wear accompanied by the abrasive wear to the abrasive wear accompanied by the adhesive wear and oxidative wear as Nb content was gradually increased.

Graphical Abstract

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铌对激光熔覆 CoCrFeNiTiNbx 高熵合金涂层微观结构和磨损性能的影响

通过激光熔覆技术制备了一组 CoCrFeNiTiNbx 高熵合金（HEAs）涂层。研究了铌含量对 HEAs 涂层微观结构和耐磨性的影响。结果表明，Nb的加入促进了BCC相向FCC相的转变，并促进了Fe2Nb Laves相的形成；随着Nb含量的增加，FCC相和BCC相的衍射峰首先向小角度移动，然后向大角度移动。添加铌促进了更多粗树枝状晶的脆性断裂，形成细树枝状晶和等轴晶粒，使 HEAs 涂层的微观结构均匀化，同时也促进了密集位错和位错相互作用的形成。随着铌含量的增加，HEAs 涂层的显微硬度先增大后减小，质量损失和摩擦系数的变化趋势相反。与 CoCrFeNiTiNb0.0 HEAs 涂层相比，CoCrFeNiTiNb1.0 HEAs 涂层的显微硬度提高了 25.00%，质量损失降低了 28.27%，摩擦系数最小。随着 Nb 含量的逐渐增加，HEAs 涂层的磨损机理由粘着磨损和氧化磨损伴随磨料磨损转变为磨料磨损伴随粘着磨损和氧化磨损。

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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.