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- W2071114444 abstract "A study was carried out to determine the role of Y during high temperature oxidation or an M-Cr-Al-Y-type coating on an Ni-base superalloy using various techniques of electron microscopy. Prior to oxidation exposures, Y was found to segregate within an external surface layer of the coating about 5 μm in thickness as well as within the interdiffusion zone. After exposure at 1000 or 1100°C in still air, Y exhibited a preferential tendency for segregation at grain boundaries of α-Al2O3 scale developed by the coating, however, a finite concentration of Y was also present in solid solution. In addition, some of the Y was found to oxidize into a Y-rich oxide “pegs” within the α-Al2O3 scale and extending into the coating. Experimental results showed that segregation of Y to grain boundaries could maintain a fine-grained scale after exposure for up to 1000 h at 1000 or 1100°C. It was concluded that, for the coating-substrate system studied, Y could improve the protective nature of α-Al2O3 scale by various mechanisms operating simultaneously." @default.
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- W2071114444 date "1994-12-01" @default.
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- W2071114444 title "Role of Y during high temperature oxidation of an M-Cr-Al-Y coating on an Ni-base superalloy" @default.
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- W2071114444 doi "https://doi.org/10.1016/0257-8972(94)90130-9" @default.
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