Abstract
The difference in hot deformation behaviors of arc melted (AM) and heat treated (HT) NbSi based ultrahigh temperature alloys has been investigated at temperatures of 1250 and 1410 °C respectively and a strain rate of 0.001 s−1. AM alloy exhibits a higher peak stress than HT alloy. The evolution of deformed microstructure signified by the change in silicide shape and size, has been obviously restrained in HT alloy compared to the AM one. During deformation at 1250 °C, continuous dynamic recrystallization (CDRX) of Nbss has been promoted in AM alloy compared with HT alloy, while CDRX process of Nb5Si3 shows little difference in both alloys. At a higher deformation temperature of 1410 °C, CDRX process of both Nbss and Nb5Si3 is slower in AM alloy than in HT alloy. Smaller Nbss grains have formed in AM alloy than in HT alloy after a height reduction of 60%, leading to a larger stress reduction during flow softening in the former.
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