摘要
RE-containing magnesium alloys were prepared via molten-salt-mediated magnesiothermic reduction by using RE_(2)O_(3)(RE=Y,Nd and Gd)and Mg metal as raw materials.The thermomechanical analysis of the magnesiothermic reduction reactions in molten salt was investigated.Then the molten-salt-mediated magnesiothermic reduction process was studied from three different perspectives.After that,the RE-containing magnesium alloy was characterized by using chemical analysis,XRD analysis and SEM analysis.The magnesiothermic reduction was a liquid-liquid reaction with relatively weak driving force.During the melting process and the magnesiothermic reduction process,magnesium metal and the obtained alloy went up and down as a whole in molten salt,which improved the process safety without introducing chloride inclusions.Meanwhile,the hydrolysis of the RECl_(3^(-))containing molten salt occurred at elevated temperature,which severely impeded the magnesiothermic reduction process.After the magnesiothermic reduction at 750°C for 2.0 h,the content of RE and the common impurity elements in the obtained RE-containing alloy met the both requirements of the commercial WE43A and WE43B.
基金
supported by the National Natural Science Foundation of China(51501178)
Autonomous Research Fund of State Key Laboratory of Multiphase Complex Systems(MPCS-2019-A-10)
