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• W3204572263 endingPage "109874" @default.
• W3204572263 startingPage "109874" @default.
• W3204572263 abstract "The CoCrW alloy was widely used for aluminum alloy die-casting mold of auto industry owing to excellent high temperature strength and corrosion resistance. However, the corrosion mechanism of cobalt-based alloy in molten Al has not been researched clearly, which inhibited improvement in resisting corrosion and service performance further. The CoCrWAl x alloys were prepared by direct laser deposition and the wetting and corrosion mechanism in molten Al were investigated. The microstructures of CoCrWAl x alloys and solid-liquid interface reaction products were characterized comprehensively. The CoCrWAl x alloys contained cobalt solid solution and precipitates that increased with Al. The reaction interfacial structure was composed of five sub-layers: alloy substrate, two products sub-layers, diffusion layer and solidified Al, and reaction products were identified to Al 9 Co 2 , Al 5 Co 2 and Al 45 Cr 7 phases. The growth kinetics of product layer and sub-layers were investigated and corresponding theoretical growth models of single and double compound layers were established. The effects of Al addition on corrosion resistance of cobalt-based alloys were analyzed with experiment and phase boundary wetting theory. The 2Al alloy obtained the lowest rate of product layer growth and corrosion loss among all alloys due to increased precipitates and strengthening matrix reduced both reaction-diffusion of molten Al and dissolved alloy substrate. The intrinsic affecting mechanism of adding Al into alloy to resist molten Al was investigated and provided an effective way to improve the corrosion resistance. • The reaction products between CoCrWAl x alloys and molten Al were identified to Al 9 Co 2 , Al 5 Co 2 and Al 45 Cr 7 phases. • The thickness of product layer kept a linear relationship with square root of time. • The product layer inhibited wetting through increased dynamic equilibrium contact angle. • The 2Al alloy restrained the diffusion and reaction between alloy and molten Al efficiently but too much Al was harmful." @default.
• W3204572263 created "2021-10-11" @default.
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• W3204572263 date "2021-12-01" @default.
• W3204572263 modified "2023-09-23" @default.
• W3204572263 title "Corrosion behaviors of CoCrWAlx alloys by laser additive manufacturing in molten Al" @default.
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• W3204572263 doi "https://doi.org/10.1016/j.corsci.2021.109874" @default.
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