The influence of strain rate and temperature on the tensile behavior of as-cast and HIPed NiAl-9Mo eutectic alloywas investigated in the temperature range of 700～950℃ and over a strain rate range from 2.08×10-4 s-1 to2.08×10-2 s-1. The results indicate that HIP process causes an enhancement in ductility and a decrease in ultimatetensile strength (UTS), yield strength (YS), average strain hardening rate as well asa drop in brittle to ductiletransition temperature(BDTT) under the same condition. lt is noticed that the BDTT of as-cast NiAl-9Mo is moredependent on strain rate than that of HIPed one. The brittle to ductile transition process of the alloy is related toa sharp drop in strain hardening rate. Regardless of strain rate, the fracture morphology changes from cleavage inNiAl phase and debonding along NiAl/Mo interface below the BDTT to microvoid coalescence above BDTT. Theapparent activation energy of the BDT of HIPed and as-cast material are calculated to be 327 and 263 k J/mol,respectively, suggesting that the mechanism is associated with lattice diffusion in NiAl phase.
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