稀土对AlTiC细化剂组织及细化效果的影响  

Effect of Rare Earths on Structure and Refining Efficiency of AlTiC Refiner

作　　者：胡宪正[1] 梁超[1] 于金[1] 谈荣生[1] 曾宇乔[1] 蒋建清[1] 

机构地区：[1]东南大学材料科学与工程系,江苏南京210096

出　　处：《中国稀土学报》2004年第2期247-250,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家九五重点科技攻关项目(99 A30 02 07);江苏省十五攻关项目(BG2000011 3)

摘　　要：应用自蔓延高温合成法制备出含稀土及不含稀土两种AlTiC细化剂。应用扫描电镜及X射线衍射等手段分析了中间合金及细化剂的成分、组织和形貌。结果表明:稀土对反应合成TiC微细颗粒具有重要的促进作用,添加稀土明显加快反应速度;在AlTiCRE细化剂中,由于稀土的作用,改变了TiAl3和TiC的形态和分布,减小了TiC的聚集倾向,细化了TiC颗粒尺寸,从而增加了形核基底数。AlTiCRE细化晶粒的效果优于AlTiC,而且稀土还具有明显细化枝晶组织的作用。Two type refiners, in which one contains rare earths and the other without, were prepared with self-propagating high-temperature synthesizing method. The composition, microstructure and morphologies of master alloys and refiners were investigated with scanning electron microscopy (SEM) and X-ray diffraction (XRD). Experimental results indicate that rare earth presents obvious effect to promote the reaction synthesizing of TiC super-fine grains and accelerate reaction velocity. The existing of rare earths affects the morphologies and distributing of the TiAl_3 and TiC, restrains the congregating tendency of TiC, and refines its granularity. AlTiCRE refiner shows obvious advantages over AlTiC refiner and evident effects on refining dendvite crystal.

关 键 词：金属材料 ALTIC 细化剂 TIC 自蔓延高温合成 细化效果 稀土 

分 类 号：TG249.7[金属学及工艺—铸造]