To enhance the high-temperature oxidation performance of Ti-6Al-4V alloy, we successfully prepared a TiNiSiCrCoAl high-entropy alloy coating on its surface via laser cladding technology. X-ray diffraction, scanning electron microscopy, and electron probe microanalysis were used to characterize the microstructure, elemental distribution, and high-temperature oxidation resistance of the coating. The results indicated that the microstructure of the coating was composed of a matrix and a σ phase. Owing to the rapid cooling via laser processing and the matched δ, ∆H_mix, and Ω, the matrix phase was an amorphous structure rich in Ti, Si, Cr, and Co, and the σ phase was an FCC structure rich in Ti, Ni, Co, and Al. The volume fraction of the amorphous-structured matrix in the coating increased with increasing laser scanning speed. The section after the oxidation treatment was composed of an oxide layer, a transition layer, and a coating matrix. The oxide layer was composed of TiO₂, Al₂O₃, and NiAl₂O₄, and the transition layer was rich in Si, Ni, and Co. The amorphous-structured matrix exhibited a higher oxidation resistance than the FCC-structured σ phase. Compared with the Ti-6Al-4V substrate, the oxidation resistance of the coating increased by 10.7, 28.1, 40.5, and 65.1 times at different laser scanning speeds under oxidation at 800 °C for 48 h, which indicates that the coating has better oxidation resistance than the Ti-6Al-4V alloy at high temperatures.

为了提高Ti-6Al-4V合金的高温氧化性能，我们通过激光熔覆技术在其表面成功制备了TiNiSiCrCoAl高熵合金涂层。X射线衍射、扫描电子显微镜和电子探针显微分析用于表征涂层的微观结构、元素分布和高温抗氧化性。结果表明，涂​​层的微观结构由基体和σ相组成。由于通过激光加工的快速冷却和匹配的δ , Δ H_混合, 和Ω, 基体相是富含Ti、Si、Cr和Co的非晶结构，σ相是富含Ti、Ni、Co和Al的FCC结构。涂层中非晶结构基体的体积分数随着激光扫描速度的增加而增加。氧化处理后的部分由氧化层、过渡层和涂层基体组成。氧化层由TiO ₂、Al ₂ O ₃和NiAl ₂ O _4组成, 过渡层富含 Si、Ni 和 Co。非晶结构的基体表现出比 FCC 结构的 σ 相更高的抗氧化性。与Ti-6Al-4V基体相比，在800 ℃氧化48 h下，不同激光扫描速度下涂层的抗氧化性分别提高了10.7、28.1、40.5和65.1倍，表明涂层具有更好的氧化性。高温下的电阻比Ti-6Al-4V合金高。