等温电磁搅拌对半固态Al-25%Si合金组织的影响

Effect of Isothermal Electromagnetic Stirring on Microstructure of Semi-solid Al-25% Si Alloy

研究了A l-25%Si合金在半固态等温电磁搅拌条件下合金显微组织的变化行为.分别在580℃、600℃下等温搅拌0 m in、10 m in、20 m in和30 m in,实验结果显示:随着搅拌时间的增加,初生硅发生细化,尺寸明显变小且边角更加钝化,分布也更加均匀;当搅拌时间超过20 m in后,初生硅尺寸变化不大,分布趋于均匀.

Variable action of Al - 25% Si alloy microstructure is studied in the condition of isothermal electromagnetic stirring. The samples are isothermally treated 0,10,20 and 30 min at the temperatures of 580℃ and 600℃. The results show that primary silicon crystal fragmentation occurs in the course of stirring, the size of the primary silicon crystal tends to be constant after 20 minutes and its phase tends to be in a homogenized distribution.