化学细化半固态Al-Si合金表观黏度及组织分析  

Study on the apparent viscosity and microstructure of semi-solid Al - Si alloy prepared by chemical refining

作　　者：罗伟[1] 严密[1] 

机构地区：[1]浙江大学硅材料国家重点实验室,浙江杭州310027

出　　处：《材料科学与工艺》2005年第4期423-426,共4页Materials Science and Technology

基　　金：高等学校博士学科点专项科研基金资助项目(2000033507)航天支撑技术基金资助项目(2002-HT-ZJDX-06).

摘　　要：为研究化学晶粒细化法对半固态Al—Si合金流变行为的影响,分别添加了Al-5Ti—B、K2TiF6、K2TiF6+石墨以及K2TiF6+Ti细化剂,在合金固化过程中利用Couette同轴圆筒式黏度计测量其表观黏度的变化,并观测不同固相分数试样微观组织.研究表明,化学晶粒细化法大大减小了半固态Al—Si合金的表观黏度,Al-5Ti—B细化效果好于K2TiF6,石墨或Ti和K2TiF6的组合较单一的K2TiF6效果显著.The paper experimentally investigated the effects of grain refining on the rheological response of semi-solid Al - Si alloys through chemical refining. Selected refiners included Al - 5Ti - B, KETiF6, K2TiF6 plus graphite and K2TiF6 plus Ti. The apparent viscosity of semi-solid Al - Si alloys was measured using Couette viscometer during solidification. Samples at different solid fractions were quenched to observe the microstructure. It was found that grain refining drastically lowered the apparent viscosity of Al - Si alloys. The effect of Al -5Ti - B was better than that of KETiF6. The effect of KETiF6plus graphite or Ti was better than that of KETiF6.

关 键 词：晶粒细化 AL-SI合金 表观黏度 凝固组织 半固态合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]