中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 19 No. 5 October 2009 |
（1. Institute of Recycling Economy, Beijing University of Technology, Beijing 100124, China;
2. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China）
Abstract:The non-isothermal heating process of Mg-Sn powder mixture was studied by differential scanning calorimetry(DSC) technique and the synthesis kinetics of Mg2Sn was evaluated by the model-free and model-fitting methods. The activation energy and conversion function of Mg2Sn synthesis reaction are calculated to be 281.7 kJ/mol and g(α)=[−ln(1−α)]1/4, respectively. The reaction mechanism of 2Mg+Sn→Mg2Sn under non-isothermal condition is regarded as “nucleation and growth”. During the non-isothermal heating process, the phase transformation occurred in the Mg-Sn powder mixture was analyzed by XRD and the microstructure evolution of Mg2Sn was observed by optical microscopy, which is in good agreement with the reaction mechanism of 2Mg+Sn→Mg2Sn deduced from the kinetic evaluation.
Key words: magnesium alloy; Mg2Sn; synthesis kinetics; differential scanning calorimetry
