Laser ablation behavior of Al0.2CrNbTiV refractory high-entropy alloy coating deposited by high speed laser cladding

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-09-22 DOI:10.1016/j.optlastec.2024.111816

Bi Zhijiang , Liu Kangcheng , Chen Tianhui , Liyan Lou , Cai Zhihai , Yi Liu , Wang Haidou , Li Chengxin

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Abstract

Al_0.2CrNbTiV refractory high-entropy alloy coating were deposited on the surface of Ti-6Al-4V titanium alloy by high-speed laser cladding technology. The laser ablation resistance of Al_0.2CrNbTiV coating is studied, and the results show that the coating can hinder laser ablation with a relatively flat ablation region formed in a diameter of ∼2100 μm and depth of ∼150 μm, which was mainly the reason of the structural characteristics of the Al-Cr-Nb-Ti-V high-entropy alloy system and the formation of the multiple oxides. Due to the high structural stability of Al-Cr-Nb-Ti-V system and good structural matching with Ti element, the diffused Ti from the substrate can be dissolved in the multi- principal elements high-entropy alloy, preventing the direct formation of series none-protective Ti oxides, with (Ti, Nb, V)O_x, AlTi₃O₆, Al₂TiO₅/AlTi₂O₅ eutectic and other oxides formed instead. At the same time, the vaporization of CrO₃ could remove a significant amount of heat, and the formation of low melting point Al₂TiO₅/AlTi₂O₅ eutectic can reduce the surface temperature, relieve stress, fill cracks of the coating. Furthermore, Al_0.2CrNbTiV coating has a higher thermal conductivity than the titanium substrate, conducive to heat loss and the coating remains relatively dense with no peeling or penetrating crack formed during the ablation process, which improve the flame-retardant property of the Al_0.2CrNbTiV coating synergistically.

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高速激光熔覆沉积的 Al0.2CrNbTiV 难熔高熵合金涂层的激光烧蚀行为

通过高速激光熔覆技术在 Ti-6Al-4V 钛合金表面沉积了 Al0.2CrNbTiV 难熔高熵合金涂层。对 Al0.2CrNbTiV 涂层的抗激光烧蚀性能进行了研究，结果表明，该涂层能够阻碍激光烧蚀，在直径 ∼2100 μm、深度 ∼150 μm 的范围内形成了一个相对平坦的烧蚀区域，这主要是 Al-Cr-Nb-Ti-V 高熵合金体系的结构特征和多重氧化物形成的原因。由于 Al-Cr-Nb-Ti-V 体系结构稳定性高，与 Ti 元素的结构匹配性好，基体中扩散的 Ti 可以溶解在多主族元素高熵合金中，防止直接形成系列非保护性 Ti 氧化物，而形成（Ti、Nb、V）Ox、AlTi3O6、Al2TiO5/AlTi2O5 共晶等氧化物。同时，CrO3 的汽化可带走大量热量，而低熔点 Al2TiO5/AlTi2O5 共晶的形成可降低表面温度，缓解应力，填补涂层裂缝。此外，Al0.2CrNbTiV 涂层的导热系数比钛基体高，有利于热量散失，而且涂层保持相对致密，在烧蚀过程中不会形成剥离或穿透裂纹，这些都协同改善了 Al0.2CrNbTiV 涂层的阻燃性能。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.