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- W3119498737 abstract "With respect to poor wear and high-temperature oxidation resistance of Ti6Al4V, the AlNbTaZrx high-entropy alloys (HEAs) coatings were successfully fabricated on Ti6Al4V by laser cladding. The microstructural evolution of the coatings with x was investigated. The changes in wear and high-temperature oxidation behaviors with x were highlighted. The results indicated that the coatings with x ranging from 0.2 to 1.0 were composed of two simple solid solutions in terms of β with a BCC structure and α′ with a HCP structure, which was well in accordance with the modified criterions proposed by us. The increase in x promoted the transformation from β into α′, resulting in the corresponding improvement in microhardness of the coatings (increased by about 17% from x = 0.2 to x = 1.0). The average wear volume and wear rate (0.72 mm3, 1.66 × 10−4 mm3 N−1 m−1) of the coatings were both reduced by about 31% when compared with those of the substrate (1.04 mm3, 2.41 × 10−4 mm3 N−1 m−1). The two indexes evaluating wear resistance firstly presented the downward tendency from x = 0.2 to x = 0.8, then were increased when x was further enhanced to 1.0. The phenomenon was closely related to the evolution in wear mechanism, which was determined to be microcutting (x = 0.2), and converted to the combination of microcutting and oxidation (x = 0.4, 0.6 and 0.8), finally identified as the mixture of microcutting, oxidation and brittle debonding (x = 1.0). The coatings also demonstrated the excellent resistance to high-temperature oxidation (1000 °C for 50 h) due to the average mass gain significantly reduced by about 76% when compared with that of the substrate. The oxidation rate of the coatings was gradually reduced with the increase in x (reduced by about 68% from x = 0.2 to x = 1.0), resulting in about 64% decrease in mass gain after 50 h. The improvement in oxidation resistance of the coatings with x should be attributed to the change in formation difficulty and stability of oxidation layers. Regarding to wear resistance and high-temperature oxidation resistance, the suitable value of x can be determined as 0.8." @default.
- W3119498737 created "2021-01-18" @default.
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- W3119498737 date "2021-05-01" @default.
- W3119498737 modified "2023-10-16" @default.
- W3119498737 title "Wear and high-temperature oxidation resistances of AlNbTaZrx high-entropy alloys coatings fabricated on Ti6Al4V by laser cladding" @default.
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- W3119498737 doi "https://doi.org/10.1016/j.jallcom.2020.158405" @default.
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