研究論文
Pを含まないAl-17%Si合金における塊状Si相の形成
2016 年 88 巻 10 号 p. 631-637
詳細
2016 年 88 巻 10 号 p. 631-637
In order to reduce weight in automobile parts, the use of hypereutectic Al-Si system alloys with high fluidity is considered. For these alloys, the presence or absence of coarse Si phase makes a large difference in the abrasion resistance. In this study, Al-17% Si alloy with no P was cast in sand mold and permanent mold, and investigations were conducted on the presence/absence of coarse Si phase in the obtained ingot.
Primary Si phase crystallized on the contact site of the mold in the sand mold and permanent mold. In the permanent mold, eutectic cells with dendritic-coupled growth were observed. The coarse Si phase had a tendency to crystallize at the top and around it. We were able to clarify the formation of the coarse Si phase based on undercooling due to concentration of solute.
