Nucleation of dendritic primaryα(Al) phase with addition of element Ce and Sr in hypoeutectic Al-7%Si-Mg cast alloy was investigated by using differential scanning calorimetry (DSC) and scanning electron microsco...Nucleation of dendritic primaryα(Al) phase with addition of element Ce and Sr in hypoeutectic Al-7%Si-Mg cast alloy was investigated by using differential scanning calorimetry (DSC) and scanning electron microscopy. DSC results were used to calculate the activation energy and nucleation work of primaryα(Al) phase. The results show that the values of activation energy and nucleation work are decreased and the nucleation frequency is increased with the additions of Ce and Sr to the alloys. Moreover, the grain size of dendriticα(Al) phase is well refined, and the nucleation temperatures of primaryα(Al) dendrites are decreased with the additions of Ce and Sr. The effects of elements Ce and Sr additions on kinetic nucleation of primary α(Al) phases were also discussed in hypoeutectic Al-7%Si-Mg cast alloy.展开更多
基金Project (42-QP-009) support by Research Fund of the State Key Laboratory of Solidification Processing,ChinaProject (B08040) supported by the Program of Introducing Talents of Discipline to Universities ("111"Project),China
文摘Nucleation of dendritic primaryα(Al) phase with addition of element Ce and Sr in hypoeutectic Al-7%Si-Mg cast alloy was investigated by using differential scanning calorimetry (DSC) and scanning electron microscopy. DSC results were used to calculate the activation energy and nucleation work of primaryα(Al) phase. The results show that the values of activation energy and nucleation work are decreased and the nucleation frequency is increased with the additions of Ce and Sr to the alloys. Moreover, the grain size of dendriticα(Al) phase is well refined, and the nucleation temperatures of primaryα(Al) dendrites are decreased with the additions of Ce and Sr. The effects of elements Ce and Sr additions on kinetic nucleation of primary α(Al) phases were also discussed in hypoeutectic Al-7%Si-Mg cast alloy.