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- 저자 : Maoliang Hu (검색결과 1 건)
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Maoliang Hu,Fei Wang,Bo Jiang,Huasheng Wang,Yile Liu,Zesheng Ji 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
Al–5Ti–1B grain refiner was successfully prepared with the reaction of Ti chips produced during machining and KBF4inpure aluminum melt. In order to illustrate the reaction mechanism of Ti chips, the effect of different feeding ways and reactiontimes of Ti chips on microstructure and refining performance of Al–5Ti–1B was systematically investigated by opticalmicroscope, scanning electron microscopy and X-ray diffractometer. The results show that, in three feeding ways, includingadding Ti chips firstly, adding KBF4firstly and adding both Ti chips and KBF4in the form of prefabricated blocks, the bestrefining performance of Al–5Ti–1B is the feeding way of using the prefabricated block. TiB2and TiAl3as effective heterogeneousnuclei are formed simultaneously around the Ti chips. The average grain size of pure aluminum is refined to about206.80 μm. The reaction time mainly affects the dissolution process of Ti chips and the average size of TiAl3. With the reactiontime from 60 min to 90 min and then to 120 min, the average size of TiAl3increases from 10.74 μm to 14.30 μm and thento 15.39 μm. During the dissolution process, Ti chips undergo a transition from a thermal isolation layer to a supersaturatedzone of Ti atoms. Based on the analysis of the dissolution process of Ti chips, the dissolution model is proposed. Al–5Ti–1B has the best refining performance at 90 min of the reaction time, which can refine pure aluminum to about 223.65 μm.
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