Al-Ti-B晶粒细化合金中的有效形核相

EFFECTIVE NUCLEATION PARTICLES IN GRAIN REFINING OF Al Ti B MASTER ALLOY

研究了ＡｌＴｉＢ晶粒细化合金中各化合物相ＴｉＡｌ３、ＴｉＢ２和ＡｌＢ２对铝晶粒的细化作用。结果表明，ＴｉＡｌ３相是有效形核相，ＴｉＢ２和ＡｌＢ２相不能单独作为形核相，Ｂ对ＡｌＴｉＢ的细化作用有显著影响，但Ｂ及硼化物不能单独影响细化过程，而是富集在ＴｉＡｌ３相中对细化过程产生重要影响。

The effects of TiAl 3, TiB 2 and AlB 2 phases in the Al Ti B master alloy on grain refining of aluminium were studied. The results showed that the TiAl 3 phase is an effective nucleation agent, while the TiB 2 and AlB 2 phases can not be nucleation particles alone. The boron which has marked influence on the grain refining of Al Ti B master alloys does not have effect on refining process alone, but it would produce important effect on the refining process when it concentrates in the TiAl 3 phases.