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[目的]采用激光熔覆技术在Ti–6Al–4V钛合金表面制备了TiC增强的TiNiCoCrVSi高熵合金(HEAs)涂层，研究TiC含量对涂层组织结构与性能的影响，为钛合金表面强化技术提供技术参考。[方法]通过X射线衍射(XRD)和扫描电子显微镜(SEM)分析了TiC质量分数不同时HEAs涂层的物相组成和微观形貌。通过显微硬度计和摩擦磨损试验机分别测试了涂层的硬度和耐磨性。[结果]涂层主要由体心立方(BCC)结构、(Ni,Co)Ti2、(Ti,V)_5Si3和TiC相组成，与基体间呈良好的冶金结合。随着TiC质量分数增大，HEAs涂层的显微硬度先增大后减小，耐磨性先改善后变差。当TiC质量分数为20%时，所得HEAs-20T涂层的显微硬度最高(1 023～1 632 HV)，为基体的2.8～4.5倍，且耐磨性最优，磨损体积仅为基体的8.57%。HEAs-20T涂层的主要磨损机制为粘着磨损，基体则以磨粒磨损和粘着磨损为主。[结论]激光熔覆技术制备的HEAs-20T涂层具有优异的综合性能，是一种极具潜力的钛合金表面强化材料。
Abstract：[Objective] Ti C-reinforced TiNiCoCrVSi high-entropy alloy(HEAs) coatings was prepared on Ti–6 Al–4V titanium alloy surface by laser cladding. The effect of mass fraction of TiC on the microstructure and properties of the coatings was studied to provide a technical reference for surface strengthening of titanium alloys. [Method] The phase composition and micromorphology of HEAs coatings with different mass fraction of TiC were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The microhardness and wear resistance of the coatings were evaluated using a microhardness tester and a wear testing machine, respectively. [Result] The coatings mainly consisted of a body-centered cubic(BCC) structure,(Ni,Co)Ti2,(Ti,V)_5Si3, and TiC phases, exhibiting good metallurgical bonding with the substrate. As the TiC mass fraction increased, the microhardness of HEAs coatings increased initially and then decreased, while the wear resistance improved firstly and then deteriorated. The HEAs-20T coating containing 20% TiC had the highest microhardness(1 023-1 632 HV), approximately 2.8-4.5 times that of the substrate, along with the optimal wear resistance, showing a wear volume only 8.57% of that of the substrate. The dominant wear mechanism of the HEAs-20T coating was adhesive wear, whereas the substrate experienced a combination of abrasive wear and adhesive wear. [Conclusion] The HEAs-20T coating prepared by laser cladding exhibits excellent comprehensive properties, demonstrating great potential as a surface strengthening material for titanium alloys.
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基本信息:
DOI：10.19289/j.1004-227x.2025.11.009
中图分类号:TG174.4;TG665
引用信息:
[1]张红霞,蔡志龙,李永斌,等.激光熔覆TiC增强的TiNiCoCrVSi高熵合金涂层组织结构与性能[J].电镀与涂饰,2025,44(11):55-62.DOI:10.19289/j.1004-227x.2025.11.009.
基金信息:
山东省自然科学基金（ZR2020KE052）; 东营市科学发展基金（2023kyqd026）; 山东石油化工学院大学生创新创业训练计划项目（DC2024097）