Achieving superplasticity at high strain rates using equal channel angular pressing

Furukawa, M., Horita, Z., Nemoto, M. and Langdon, T.G. (2000) Achieving superplasticity at high strain rates using equal channel angular pressing. Materials Science and Technology, 16 (11-12), 1330-1333.

Abstract

Equal channel angular pressing (ECAP) is a processing procedure in which a sample is pressed through a die containing a channel bent into an L shaped configuration. This procedure introduces a high strain into the sample without any change in the cross-sectional area and it may be used to attain an ultrafine grain size with dimensions lying typically within the submicrometer range. This paper describes a series of experiments where ECAP was applied to a commercial Al–Mg–Li–Zr alloy having an initial grain size of ~400 µm. The results demonstrate a refinement in the grain size of this alloy to ~1 µm and it is shown that these small grains are stable up to temperatures >600 K because of the presence of betaprime-Al3Zr particles. The stability of these ultrafine grains at elevated temperatures provides an opportunity to achieve superplastic ductilities in this alloy at very high strain rates: for example, the measured elongations to failure under optimum pressing conditions exceed 1000% at a strain rate of 10-1 s-1 when testing at temperatures above 600 K.

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Contributors

Author: T.G. Langdon

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