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synopsis The powder of nickel-base superalloy Mod. IN-100 was consolidated by hot isostatic pressing and recrystallized under the conditions of extrusion ratio of 72% at 1 373 K and subsequent annealing at 1 343 K ×1h. The fine grain size of 1.5μm in diameter was obtained。 The superplastic behaviour of alloy bars mentioned above was investigated in the temperature range of 1 223-1 423 K and in the range of strain rates from 2.5 •~ 10 to 10-1 sl. The in ci vs. In curves were obtained. It was shown that the conditions obtaining the ina-_,jmum strainrate sensitivity index, in changed from the constant strain rate of 10 2 s-1 at temperatures above 1 303 K to the constant flow stress of 150 MPa below 1 303 K. Therefore, it was possible to divide the In e vs. In

Superplastic Behaviour and Optimum Work Processing of a Powderconsolidated and Extruded Ni-base Superalloy