ON ACTIVATION ENERGY DURING INITIAL STAGE OF SUPERPLASTIC DEFORMATION

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Pages (from-to)95-102
Journal / PublicationScripta Materialia
Volume39
Issue number1
Publication statusPublished - 5 Jun 1998
Externally publishedYes

Abstract

The current paper addresses the issue of extracting activation energy from flow stress data under fixed strain rate and strain levels. If the micro structure s in the superplastic materials after thermomechanical treatments need to evolve gradually during the initial stage of superplastic straining, the structure evolution rate might be different at different test temperatures. A higher activation energy would result in if one uses the flow stress data at ∈ < 0.5, where the structure has not yet reached its stable condition. The calculated activation energy might not reflect the true deformation mechanisms.

Citation Format(s)

ON ACTIVATION ENERGY DURING INITIAL STAGE OF SUPERPLASTIC DEFORMATION. / Huang, J.C.; Fu, H.C.; Lou, B.Y.; Lee, H.L.

In: Scripta Materialia, Vol. 39, No. 1, 05.06.1998, p. 95-102.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review