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Oxidation Behavior of MAX Phase Ti2Al(1−x)SnxC Solid Solution


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MAX phase Ti2Al(1−x)SnxC solid solution with = 0, 0.32, 0.57, 0.82, and 1 was synthesized by pressureless sintering of uniaxially pressed Ti, Al, Sn, and TiC powder mixtures. Annealing in air atmosphere at 200°C–1000°C triggered a sequence of oxidation reactions which reveal a distinct influence of solid solution composition on the oxidation process. With decreasing Al/Sn ratio, the characteristic temperature of accelerated oxidation reaction of A-element was reduced from 900°C (= 0) to 460°C (= 1). SnO2 was formed at temperatures significantly lower than TiO2 (rutile) and Al2O3. Substitution of A-element in MAX phase solid solution by low-melting elements such as Sn may offer potential for reducing oxidation-induced crack healing temperatures.

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