# Investigation of superplasticity by the impression creep technique

Kumar, N and Raman, KS and Sastry, DH and Little, EA (1990) Investigation of superplasticity by the impression creep technique. In: Journal of Materials Science, 25 (1). pp. 753-755.

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## Abstract

Impression creep tests have been carried out on a $Zn-22\% Al$ eutectoid alloy in two heattreatment conditions, as a function of applied stress and at temperatures of $\sim 25$ to $270^0C$. At small grain sizes $(\sim 0.9 \mu m)$ and in the temperature range $\sim 180$ to $270^0C$ the observed deformation response conforms to Regions I, II and III typical of superplastic behaviour. Furthermore, strain-rate index values determined for Region II fall in the range 0.44 to 0.51, consistent with superplasticity. It is concluded that the impression creep technique offers considerable potential for characterization of superplastic alloy systems on small specimen volumes.

Item Type: Journal Article Journal of Materials Science Springer Copyright of this article belongs to Springer. Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) 29 Jun 2007 18 Jan 2012 06:11 http://eprints.iisc.ac.in/id/eprint/11333