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激光熔覆原位Al₂O₃@TiC核壳颗粒AlCoCrFeNiTi高熵合金涂层
Laser-Clad AlCoCrFeNiTi HEA Coating with In-Situ Al2O3@TiC Core–Shell Particles
Coatings
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Multidisciplinary Digital Publishing Institute
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激光熔覆非热喷涂，参数缺失仅可参考
AI理解
要点 激光熔覆在45钢上制备AlCoCrFeNiTi高熵合金涂层，组织为BCC基体、B2析出相加原位Al2O3@TiC核壳颗粒。平均显微硬度781 HV0.2，约基材2.3倍，摩擦系数低31.25%，磨损率为基材57.75%。
能不能用 这是激光熔覆，不是热喷涂，需要激光器配同步送粉或预置粉末加惰性气保护，无法直接挂到HVOF/APS产线。基材45钢与实际工件接近，但摘要未给激光功率、扫描速度、送粉率、光斑尺寸与保护气流量，也未给磨损试验载荷、转速、对磨副及标准，工艺窗口无法复现，只能参考核壳原位增强的思路。
存疑
- 磨损试验载荷、转速、对磨副与测试标准摘要均未给出，结果无法横向比较。
- 激光功率、扫描速度、送粉率、光斑尺寸等熔覆参数缺失，无法复现工艺窗口。
- 磨损率只给相对基材的57.75%，未给绝对值，无法与自有涂层数据对照。
中文摘要
采用激光熔覆在45钢基体上沉积AlCoCrFeNiTi高熵合金涂层，以改善其表面性能。涂层显微组织由BCC固溶体基体、B2有序析出相以及原位Al₂O₃@TiC核壳纳米颗粒组成。HRTEM显示核与壳之间存在半共格界面，这归因于6.43%的低晶格错配度。力学与摩擦学试验表明，该涂层平均显微硬度为781 HV0.2，约为基体的2.3倍，摩擦系数降低31.25%，磨损率仅为基体的57.75%。涂层主要发生磨粒磨损，而基体则遭受严重的黏着磨损和氧化磨损。强化来源于固溶强化和第二相强化，硬质的Al₂O₃@TiC相有助于稳定性、硬度和耐磨性。这些结果表明，核壳结构涂层有效改善了45钢的表面性能，并为通过激光熔覆制备高熵合金刀具涂层提供了理论指导。
查看英文摘要
Laser cladding was employed to deposit an AlCoCrFeNiTi high-entropy alloy coating on 45 steel substrate to enhance its surface properties. The coating microstructure consists of a BCC solid-solution matrix with B2-ordered precipitates and in-situ Al2O3@TiC core–shell nanoparticles. HRTEM reveals a semi-coherent interface between the core and shell, attributed to a low lattice mismatch of 6.43%. Mechanical and tribological tests show that the coating exhibits an average microhardness of 781 HV0.2, about 2.3 times that of the substrate, and a 31.25% lower friction coefficient and a wear rate only 57.75% of that of the substrate. The coating primarily undergoes abrasive wear, whereas the substrate suffers severe adhesive and oxidative wear. Strengthening originates from solid-solution and second-phase strengthening, with the hard Al2O3@TiC phase contributing to stability, hardness, and wear resistance. These results indicate that the core–shell structured coating effectively improves the surface performance of 45 steel and offers theoretical guidance for fabricating high-entropy alloy tool coatings via laser cladding.
原文依据
查看原文依据
- Laser cladding was employed to deposit an AlCoCrFeNiTi high-entropy alloy coating on 45 steel substrate to enhance its surface properties.
- Mechanical and tribological tests show that the coating exhibits an average microhardness of 781 HV0.2, about 2.3 times that of the substrate, and a 31.25% lower friction coefficient and a wear rate only 57.75% of that of the substrate.
- The coating primarily undergoes abrasive wear, whereas the substrate suffers severe adhesive and oxidative wear.
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DOI: 10.3390/coatings16101181