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High Temperature Creep in a Semi-Coherent NiAI-Ni2AITi Alloy R. S. POLVANI, WEN-SHIAN TZENG, AND P. R. STRUTT Creep experiments have been made on a Ni-Ti-A1 alloy, which has a microstructure consisting of a distribution of semi-coherent NiAl (/3) precipitates with a NieAITi(/3')Heusler phase matrix. The creep strength of this bcc type structure alloy is at least comparable with that of the nickel-base superailoy MARM-200 for values of T / T m in the range 0.68 to 0.82. Quantitative electron microscope experiments show that both undissociated ao

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