The Portevin-LeChatelier effect in Cu-Al alloy and failure of the cottrell theory

Ryuta Onodera, Xu Zhi Quan, Masatoshi Aramaki

Research output: Contribution to journalArticle

Abstract

The Portevin-LeChatelier (P-L) effect in Cu-(4-10)at%Al alloys has been investigated in wide ranges of temperature and strain rate. It is shown that the occurrence of serrated flow was primarily determined by the solute concentration, that is, it did not occur in the 4.3 at%Al alloy and occurred strongly in the 10.1 at%Al alloy. It occurred weakly in the 7.4 at%Al alloy, which suggests that the Al concentration of 7 at% is the critical one for the P-L effect. It is also shown that the prediction by the Cottrell theory is inconsistent with the experimental result in the point of effects of solute concentration and strain rate on the occurrence of serrated flow. The formation of short range ordered region is proposed as a reasonable cause of the P-L effect in the alloy.

Original languageEnglish
Pages (from-to)627-633
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume66
Issue number6
DOIs
Publication statusPublished - Jun 2002

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strain rate
Strain rate
solutes
occurrences
causes
predictions
Temperature
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

The Portevin-LeChatelier effect in Cu-Al alloy and failure of the cottrell theory. / Onodera, Ryuta; Quan, Xu Zhi; Aramaki, Masatoshi.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 66, No. 6, 06.2002, p. 627-633.

Research output: Contribution to journalArticle

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abstract = "The Portevin-LeChatelier (P-L) effect in Cu-(4-10)at{\%}Al alloys has been investigated in wide ranges of temperature and strain rate. It is shown that the occurrence of serrated flow was primarily determined by the solute concentration, that is, it did not occur in the 4.3 at{\%}Al alloy and occurred strongly in the 10.1 at{\%}Al alloy. It occurred weakly in the 7.4 at{\%}Al alloy, which suggests that the Al concentration of 7 at{\%} is the critical one for the P-L effect. It is also shown that the prediction by the Cottrell theory is inconsistent with the experimental result in the point of effects of solute concentration and strain rate on the occurrence of serrated flow. The formation of short range ordered region is proposed as a reasonable cause of the P-L effect in the alloy.",
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