【摘要】 对三种不同加盐次序制备的Al-Ti-B中间合金的细化效果进行了研究。结果表明,三种不同加盐次序制备的中间合金的显微组织相似,但细化效果不同。混合加盐时制备的中间合金细化效果最好,先加KBF4后加K2TiF6制备的中间合金细化效果最差。此外,混合加盐时制备的中间合金在不同条件下具备不同的细化性能,随着中间合金加入量增大,细化后纯铝的晶粒尺寸持续减小;变质时间为5min时,细化效果好,时间超过60min后,细化效果出现衰退;在变质温度为710～740℃时,具有较好的细化效果。更多还原

【Abstract】 The refining efficiency of Al-Ti-B master alloys produced by three different salt addition sequences was investigated. The result indicates that the master alloys produced by three different salt addition sequences have similar microstructure, but the refining efficiency is different. The master alloy produced by pre-mixed salt have the best refining efficiency, and the master alloy produced by adding KBF4 first is worse in refining efficiency. In addition, the refining properties of master alloy produced by pre-mixed salt were investigated. The results indicate that the size of α-Al reduces at all time with the increase of additional quality of master alloy. The refining efficiency is better when the transmutative time witin 5 min. When the refining time is beyond 60 min, the fading phenomena occurred markedly; the temperature was ranging from 710℃ to 730℃, the grain refining performance of the master alloy is excellent.更多还原