Evaluation of the true activation enthalpy of superplastic flow including a threshold stress

N. Q. Chinh, P. Tasnádi, A. Juhász, I. Kovács, E. Kovács-Csetényi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A new method is suggested for the evaluation of the true activation enthalpy for alloys where the strain rate of the superplastic flow varies with a power of an effective stress σe = σ-σo, where σ and σo are the applied stress and a threshold stress, respectively. Some earlier results concerning superplastic AlMgZnCu alloys containing chromium and in which a strongly temperature-dependent threshold stress can be revealed, are reanalysed. The results are in good agreement with the previous ones. It has been shown further that for the alloys investigated the true activation energy increases with increasing chromium content.

Original languageEnglish
Pages (from-to)2341-2344
Number of pages4
JournalJournal of Materials Science
Volume29
Issue number9
DOIs
Publication statusPublished - Jan 1 1994

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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