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The effect of yttrium on the oxidation resistance of elemental powder metallurgy (EPM) processed TiAl-based alloys was studied. Y-addition improved the oxidation resistance of the experimental alloys exposed at 800 o C for 350 h. The improved oxidation resistance was attributed to a fine-grained (Y, Al)O-type oxides and the segregation of Y in the grain boundaries and at the interfaces of...
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