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Precipitation of a titanium silicide Ti 5 Si 3 was found to be beneficial to improvement of the creep resistance of a fully lamellar Ti-48Al-1.5Cr cast alloy without the sacrifice of tensile properties. The addition of 0.26-0.65 mol% Si generates fine precipitates less than 200 nm in size during aging at 900 o C for 5 h. The precipitates are effective obstacles to dislocation...