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Modified Constitutive Equation of Superplasticity Including Grain Growth Rate
Published online by Cambridge University Press: 10 February 2011
Abstract
Superplastic behavior associated with grain growth in ceramics at high temperature is predicted by using a modified constitutive equation for superplasticity that incorporates the rate of grain growth. The equation reveals that there is an optimum deformation conditions – i.e., the strain rate and deformation temperature - so that ceramics have low flow stress when the grain growth is significant. The equation provides an explanation of increased flow stress for liquid-phase-sintered SiC in the slow-strain-rate region or higher-temperature region in which grain growth plays an important role.
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- Copyright © Materials Research Society 2000