Portevin-Le Chatelier effect triggered by complex loading paths in an Al–Cu aluminium alloy

Sicong REN, T.F. Morgeneyer, M. Mazière, S. Forest, G. Rousselier

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

Serrated flow has been observed during non monotonic tensile tests of an Al–Cu aluminium alloy in the naturally aged state. The associated propagative localisation bands were observed by digital image correlation (DIC). In particular, the Portevin-Le Chatelier (PLC) effect and also Lüders bands were observed in interrupted tests during which the specimen was held for a length of time and also in tests with partial unloading followed by a holding time. Increasing strain rate jumps also triggered the PLC effect. These observations indicate the existence of the PLC effect in this material which was formerly considered insensitive to it at room temperature under monotonic loading conditions. There is no evidence of PLC serrations during constant strain rate tests. A strain ageing finite element model is used that captures the experimentally found PLC triggering effects.

Original languageEnglish
Pages (from-to)659-678
Number of pages20
JournalPhilosophical Magazine
Volume99
Issue number6
DOIs
Publication statusPublished - 19 Mar 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • AA2139-T3 aluminium alloy
  • Portevin-Le chatelier effect
  • strain path change
  • strain rate sensitivity
  • stress relaxation

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