Abstract
In this study, the tensile deformation behavior of as-extruded AZ91 magnesium alloy under pulsed electric current has been investigated based on microstructural observations. The flow stress decreased and the elongation increased remarkably on applying electric current in comparison with non-pulsed tensile test at both room temperature and at 70°C. The results of EBSD and EDS analysis showed that dissolution of the Mg17Al12 phase obviously occurs during pulsed tensile test due to thermal effect caused by Joule heating and athermal effect of electric current. To distinguish the athermal and thermal effects of electric current, the induction heat treatment (IHT) that follows the temperature cycle measured during pulsed tensile test was carried out using a dilatometer, which could control the temperature of specimen by an induction heater in a vacuum. Additionally, electropulsing treatment (EPT) was conducted and compared with the conventional heat treatment (CHT) under the same condition. The fraction of Mg17Al12 phase after pulsed tensile test and EPT was obviously lower in comparison with IHT and CHT, respectively. The results prove that applying electric current accelerates dissolution of Mg17Al12 phase in as-extruded AZ91 alloy with a distinct effect from Joule heating during deformation. It is proposed that electrically-assisted manufacturing (EAM) technique can improve the efficiency of forming process for as-extruded AZ91 alloy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
