Some aspects of Portevin-Le Chatelier plastic instabilities investigated by infrared pyrometry

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:394

Article

Ranc, N ; Wagner, D

关键词: Portevin-Le Chatelier effect;    dynamic strain aging;    plastic instability;    infrared pyrometry;   

DOI  :  10.1016/j.msea.2004.11.042

来源: Elsevier

【 摘 要 】

The deformation heterogeneity related to the Portevin-Le Chatelier effect has been studied for aluminium-copper alloy during a tensile test at ambient temperature. Plastic deformation is accompanied by dissipation of mechanical energy into heat. To observe the localization of deformation in bands, we used a pyrometer coupled to an infrared camera. This device serves to visualize the formation of the deformation bands and to quantify apparent velocity. From these thermal data, we can also determine the geometrical characteristics of the bands: orientation, bandwidth, and space between two bands. The aperture time (1500 mu s) and the acquisition frequency of the camera (60 Hz) allow the band-formation time and the middle-band time to be estimated. The measurement of the variation in temperature during the appearance of a band is used to quantify the plastic deformation in the band. (c) 2004 Elsevier B.V. All rights reserved.

【 授权许可】

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