重熔工艺对Al-Ti-C晶粒细化剂组织的影响  

Effects of Re-melting Process on Microstructure of Al-Ti-C Refiners

作　　者：周天国[1,2] 于文馨[1] 张雪飞[1] 夏鸿雁[1] 顾迎新[1] 

机构地区：[1]沈阳大学机械工程学院 [2]辽宁省先进材料制备技术重点实验室

出　　处：《特种铸造及有色合金》2010年第1期21-23,共3页Special Casting & Nonferrous Alloys

摘　　要：采用Lasertec1LMH21共焦扫描激光显微镜和光学显微镜,观察了Al-Ti-C晶粒细化剂在加热熔化过程中的组织变化与凝固后的组织。结果发现,在加热过程中,Al-Ti-C细化剂中Al基体首先熔化,随后片状Ti Al3和TiC相成为游离相,然后被熔断、破碎成细小的新质点,其破碎程度随着保温时间的延长与熔化温度的升高而加剧。重熔工艺可有效改善Ti Al3和TiC晶粒的形貌,低温对Ti Al3相的形貌影响较大,高温对TiC相的形貌影响较大。Microstructure evolution of Al-Ti-C refiner during melting and solidification process was observed by the Lasertec 1LMH21 confocal scanning laser microscope and optical microscope(OM).The results indicate that during melting process,Al matrix is firstly melted in Al-Ti-C refiner,and then lamellar TiAl3 phase and TiC phase becomes free phase in liquid aluminum,finally the TiAl3 phase is broken into fine particles,meanwhile,with increasing in holding time and in melting temperature,the broken degree is enhanced.The grain morphology of TiAl3 and TiC phase is effectively improved by re-melting process at 700～800℃.With remelting temperature more than 800℃,TiAl3 particles are coarsened to fail to refining,while TiC phase with desirable size can be obtained at a higher re-melting temperature with a subsequently rapidl solidification.

关 键 词：Al-Ti-C合金 微观组织 TIAL TIC 细化机理 

分 类 号：TG146.2[一般工业技术—材料科学与工程]