Deficiency in hot plasticity is a major limiting factor for the development of disc alloys with superior mechanical properties and temperature capabilities. The deformation behavior of a series of highly alloyed disc alloys with s from 26% to 63% was experimentally and analytically investigated in this work. Flow stress data and the as-deformed structures were obtained using isothermal compression tests in which the prior thermomechanical history of experimental alloys was also taken into consideration. The results reveal that the two structural categories, the dispersion and the + duplex, exhibit significant differences in deformation mechanisms. Among all of the experimental alloys, the stability of the increases with the increasing concentration of -forming elements. The formation of the + duplex always results in a decrease in flow stress and a promotion of plasticity. In particular, the + duplex structures exhibit the ability to maintain superplasticity at a high strain rate up to 0.1 s -1 . The distribution of strain rate sensitivity and activation energy in the relationships with temperature and strain rate accurately identifies a specific domain within which Both the microstructural characterization and the mechanical interpretation confirm that the inherent characteristics of the duplex, including flow softening, plasticity promotion and highstrain-rate superplasticity, mainly originate from a strain-induced, high-velocity -, which is similar to that of cellular reaction or eutectoid transformation. For the alloys with up to more than 60% of , by producing a using TMP, the hot working process, including billet conversion and microstructure customization, can be achieved in a cost-effective manner on an industrial scale.
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