Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 404, Issue 1-2, Pages 188-196Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2005.05.058
Keywords
Al-4wt.% Mg; Portevin-Le Chatelier effect; infrared camera; temperature variations; heat sources
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This paper presents an experimental investigation on temperature variations associated with the Portevin-Le Chatelier (PLC) effect. Using thermal fields, this work was aimed at gaining further insight into the spatio-temporal distribution of PLC bands. A fast multidetector infrared camera was used for the observations, in a room temperature tensile test conducted at constant strain rate. As the thermal diffusivity of the aluminum alloy is very high, the measured temperature variations were quite low and very diffuse. The associated heat sources were calculated in order to increase the precision of PLC band detections. These fields revealed localized dissipative bands oriented according to the loading direction. They were classified as type A or B according to their spatio-temporal distribution. Then, various band characteristics were determined: shape, width, orientation, propagation direction, changes of orientation, band propagation velocity, duration and period. (c) 2005 Elsevier B.V All rights reserved.
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