原材料和冷却速率对铝钛硼细化剂第二相组织形态的影响

Effect of Raw Material and Cooling Rate on Microstructure Morphologies of Second-phase in Al-Ti-B Refiner

采用氟盐法和海绵钛法以及它们两个的混合法制备了铝钛硼中间合金细化剂。研究了冷却速率对铝钛硼中间合金中第二相的弥散程度、粒度、形貌的影响,并将氟盐与海绵钛混合后制备的中间合金细化剂的效果与氟盐法、海绵钛法分别制备的中间合金的效果进行了比较。结果表明:用氟盐法制备中间合金的细化效果以及第二相的弥散程度、形态和粒度都要好于用海绵钛以及用海绵钛和氟盐法混合制备的中间合金;第二相的粒度与模具材料的导热系数之间存在着显著负相关性。

Al-Ti-B intermediate alloy refiner was prepared by using fluoride salt method, titanium sponge method and their mixing method. The effects of the cooling rate on degree of dispersion, grain size, morphology of the second phase in AI-Ti-B intermediate alloy were studied. The effect of intermediate alloy refiner prepared by using fluoride salt mixed with titanium sponge method and the effect of intermediate alloy refiner prepared by using fluoride salt method and titanium sponge method was compared. The results show that： refining effect and dispersion degree of the second phase, morphology and particle size degree of the intermediate alloy prepared by using fluoride salt method are better than those of the intermediate alloy prepared by using titanium sponge and titanium sponge mixed fluoride salt methods; there is a significant negative correlation between the particle size degree of the second phase and the thermal conductivity of mold material.