QUICK-PLASTIC FORMING: SIMILARITIES AND DIFFERENCES WITH SUPER-PLASTIC FORMING
Résumé
In order to extend the industrial use of SuperPlastic Forming (SPF), efforts have been devoted in the recent past to reduce forming times. The more spectacular result is probably the development of the so-called Quick Plastic Forming (QPF) technology which has been particularly investigated in the US automotive industry. QPF has been mainly studied in the case of Al-Mg alloy and to a much lesser extent in the case of magnesium alloys. In this presentation, some similarities and differences between QPF and SPF will be discussed. In particular, results will be shown concerning the respective mechanisms of deformation and fracture. A particular attention is paid to the sensitivity of the deformation and fracture mechanisms to temperature and strain rate of a wrought magnesium alloy. In this framework, data deduced from both mechanical characterisation (strain rate jump tests and tests at constant strain rate) and structural characterisation (deformed microstructures studied by microscopy and X-ray micro-tomography) will be presented.
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