Occurrence of the Portevin Le-Chatelier effect in open-cell microcellular Al-2 wt% Mg

0509298 - ÚFP 2020 RIV US eng J - Journal Article
Knapek, M. - Dobroň, P. - Máthis, K. - Illková, Ksenia - Mortensen, A. - Chmelík, F.
Occurrence of the Portevin Le-Chatelier effect in open-cell microcellular Al-2 wt% Mg.
Scripta Materialia. Roč. 132, April (2017), s. 13-16. ISSN 1359-6462. E-ISSN 1872-8456
Institutional support: RVO:61389021
Keywords : flow * Portevin Le-Chatelier effect * Metal foams * Strain rate sensitivity * Acoustic methods * Plastic deformation
OECD category: Materials engineering
Impact factor: 4.163, year: 2017
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S1359646217300301?via%3Dihub

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.
Permanent Link: http://hdl.handle.net/11104/0300046