(1. 蘭州理工大學(xué) 甘肅省有色金屬新材料省部共建國家重點(diǎn)實驗室，蘭州 730050；
2. 蘭州理工大學(xué) 有色金屬合金及加工教育部重點(diǎn)實驗室，蘭州 730050)
摘 要: 研究Al-TiC和Al-TiAl3中間合金中第二相粒子TiC和TiAl3 對純鋁晶粒的細(xì)化作用。結(jié)果表明：當(dāng)TiC和TiAl3單獨(dú)作為α(Al)的形核相時，兩者的形核能力均較差，但TiC粒子的形核和抗細(xì)化衰退能力優(yōu)于TiAl3粒子的；當(dāng)?shù)诙嗔Ｗ覶iC和TiAl3共同作為α(Al)的形核相，且加入量適當(dāng)時，表現(xiàn)出較強(qiáng)的形核能力和抗晶粒細(xì)化的衰退能力，細(xì)化效果較顯著；配成的7組晶粒細(xì)化劑中，當(dāng)細(xì)化劑中Ti和C摩爾比為1.8׃1時，晶粒細(xì)化效果最好；這是由于TiAl3在鋁熔體中分解釋放出Ti原子并向TiC粒子周圍偏聚，形成的TiC/鋁熔體界面富Ti過渡區(qū)促進(jìn)了TiC粒子在鋁熔體中的均勻分布，提高了其形核能力。
關(guān)鍵字: Al-TiC中間合金；Al-TiAl3中間合金；TiC；TiAl3；晶粒細(xì)化
TiAl3 phases in master alloys on pure aluminum
（1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology,
Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of
Technology, Lanzhou 730050, China）
Abstract:The second phase particles TiC and TiAl3 on the refining performances of pure aluminum particles were studied in Al-TiC and Al-TiAl3 master alloys. The results show that, when TiC and TiAl3 phases are used as the α(Al) nucleation phase, both of the two nucleation capabilities are poor, but TiC particle exhibits better nucleation and higher resistance to grain refining fading than TiAl3 phase. When the second phase particles TiC and TiAl3 are used as the α(Al) nucleation phase and have a relatively quantity, they demonstrate better nucleation and higher resistance to grain refining fading. The experiments show that, in the seven groups grain refiners, the refining performances of the refiner with mole ratio of Ti to C of 1.8׃1 is the best. The reason is that the TiC/aluminum interface, Ti-rich transition zone, formed by TiAl3 releasing Ti atoms in aluminum melt, Ti atoms congregating to the TiC surface, promotes the distribution of TiC in aluminum melt and advances the nucleation of TiC.
Key words: Al-TiC master alloy; Al-TiAl3 master alloy; TiC; TiAl3; grain refinement
