初生硅相的影響
(1. 蘭州理工大學 甘肅省有色金屬新材料省部共建國家重點實驗室，蘭州 730050；
2. 蘭州理工大學 有色金屬合金省部共建教育部重點實驗室，蘭州 730050)
摘 要: 采用受控擴散凝固技術(shù)(CDS)制備Al-15%Si(質(zhì)量分數(shù))合金，研究混合方式對受控擴散凝固Al-15%Si合金初生硅相尺寸、形貌和分布的影響。結(jié)果表明：受控擴散凝固可以明顯細化初生硅相，改善初生硅相形貌和在組織中的分布。其中，液−液混合細化效果比固−液混合細化效果好，特別是通過液態(tài)純鋁與液態(tài)Al-25%Si合金的液−液混合受控擴散凝固制備得到的凝固組織，其初生硅相平均尺寸僅為14 μm，且在組織中分布均勻。
關(guān)鍵字: 過共晶Al-Si合金；受控擴散凝固(CDS)；初生硅
（1. State Key Laboraty of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology,
Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys, Ministry of Education, Lanzhou University of Technology,
Lanzhou 730050, China）
Abstract:The controlled diffusion solidification (CDS) was used to prepare hypereutectic Al-15%Si alloy, and the effects of mixing ways during CDS process on the size, morphology and distribution of primary silicon were studied. The results show that CDS can refine the size of primary silicon obviously. Meanwhile, the morphology and distribution of primary silicon can also be improved. The effect of liquid-liquid mixing is better than that of solid-liquid mixing. Especially, the microstructure of liquid pure Al mixing with liquid Al-25%Si alloy is the best. The particle size of primary silicon reaches up 14 μm and the primary silicon distributes uniformly in the matrix.
Key words: hypereutectic Al-Si alloy; controlled diffusion solidification; primary silicon
