摘要
Sr变质处理后,A356合金初晶形核温度略有提高,共晶温度明显降低,从而通过影响初晶凝固过程提高晶粒细化效果;不添加细化剂,Sr本身对晶粒细化的影响并不明显;添加细化剂后,变质处理不仅可以激活更多的形核核心,而且由于明显增加了枝晶凝聚后二次枝晶的生长过冷度,从而减小了二次枝晶臂间距。
Experimental results showed that Sr modification influences primary dendrite solidification process with nucleating temperature increasing slightly and eutectic temperature decreasing greatly; without addition of refiner, effect of Sr modification on refinement is slight; with addition of refiner, Sr modification could not only activate more nucleant particles, but also refine the secondary dendrite arm spacing because the undercoaling of dendrite growth is obviously increased.
出处
《铸造》
CAS
CSCD
北大核心
2004年第8期599-601,共3页
Foundry
