TY - JOUR
T1 - Laser ablation behavior of Al0.2CrNbTiV refractory high-entropy alloy coating deposited by high speed laser cladding
AU - Bi, Zhijiang
AU - Liu, Kangcheng
AU - Chen, Tianhui
AU - Lou, Liyan
AU - Cai, Zhihai
AU - Liu, Yi
AU - Wang, Haidou
AU - Li, Chengxin
N1 - Publisher Copyright:
© 2024
PY - 2025/2
Y1 - 2025/2
N2 - Al0.2CrNbTiV 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 Al0.2CrNbTiV 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)Ox, 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, Al0.2CrNbTiV 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 Al0.2CrNbTiV coating synergistically.
AB - Al0.2CrNbTiV 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 Al0.2CrNbTiV 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)Ox, 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, Al0.2CrNbTiV 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 Al0.2CrNbTiV coating synergistically.
KW - Coating
KW - High entropy alloy
KW - High speed laser cladding
KW - Laser ablation
KW - Rapid oxidation behavior
UR - https://www.scopus.com/pages/publications/85204379374
U2 - 10.1016/j.optlastec.2024.111816
DO - 10.1016/j.optlastec.2024.111816
M3 - 文章
AN - SCOPUS:85204379374
SN - 0030-3992
VL - 181
JO - Optics and Laser Technology
JF - Optics and Laser Technology
M1 - 111816
ER -