Mobility of edge dislocations in Al-Mg solution hardened alloys at high temperatures

Hideharu Nakashima, Hideo Yoshinaga

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

For the high-temperature deformation of Al-Mg alloys, the dislocation densities which were obtained by the stress change and stress relaxation tests using the theoretical edge dislocation-mobility of Cottrell, were about 10 times as large as the densities measured by transmission electron microscopy. The mobility of edge dislocations dragging solute-atmospheres was re-evaluated by assuming that the interaction energy between edge dislocation and solute atom is relaxed with increase in solute concentration. The obtained results are summarized as follows. (1) The re-evaluated mobility in an Al-5.0 mol%Mg alloy, for example, is about 5 times as large as Cottrell's mobility. (2) The mobility tends to saturate with increase in the solute concentration. The dislocation densities obtained in Al-Mg alloys by the stress change and stress relaxation tests were re-estimated using the re-evaluated mobility. It was found that the re-estimated dislocation densities agree approximately with the densities obtained by transmission electron microscopy.

Original languageEnglish
Pages (from-to)254-261
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume56
Issue number3
DOIs
Publication statusPublished - 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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