Occurrence of the Portevin Le-Chatelier effect in open-cell microcellular Al-2 wt% Mg
Knapek, M.; Dobron, P.; Mathis, K.; Illkova, K.; Mortensen, A.; Chmelik, F.
2017

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Abstract

Microcellular open-cell metal foams with pores of 75 or 400 pm in diameter and made of pure Al or Al-2 wt% Mg are tested in compression. The aluminum foam exhibits a typical smooth plastic flow and a positive strain rate sensitivity, whereas plastic instabilities and a negative strain rate sensitivity appear in the stress-strain curves of the Al-2 wt Mg foams, indicating the presence of the Portevin Le-Chatelier (PLC) effect. The effect is further confirmed by acoustic emission analysis.Taken together, the data indicate that the PLC effect is caused in this material by the sudden collective deformation of many struts across the material. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Title Occurrence of the Portevin Le-Chatelier effect in open-cell microcellular Al-2 wt% Mg
Author(s) Knapek, M. ; Dobron, P. ; Mathis, K. ; Illkova, K. ; Mortensen, A. ; Chmelik, F.
Published in Scripta Materialia
Pagination 4
Volume 132
Pages 13-16
Date 2017
Publisher Oxford, Elsevier
ISSN 1359-6462
Keywords
DOI https://doi.org/10.1016/j.scriptamat.2017.01.020
Other identifier(s) View record in Web of Science
Laboratories LMM
Record Appears in Scientific production and competences > STI - School of Engineering > IMX - Institute of Materials > LMM - Mechanical Metallurgy Laboratory
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2017-05-01

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