对利用非自耗电弧熔炼设备得到的Ti-46Al,Ti-46Al-0.3B,Ti-46Al-0.5B,Ti-46Al-2Fe,Ti-46Al-2Fe-0.3B和Ti-46Al-2Fe-0.5B合金的凝固组织进行了研究.结果表明,铸态TiAl基合金的宏观组织为典型的柱状晶组织,而且平均柱状晶直径随着Fe和B元素的加入显著减小.其中,Ti-46Al-2Fe-0.5B合金的柱状晶直径最小.B元素可以显著地细化TiAl基合金的柱状晶组织和枝晶组织,这主要是由于B元素的添加可以显著增加固液界面前沿的成分过冷度从而细化TiAl基合金的凝固组织.而且,Fe元素的添加还可以显著地提高B元素对TiAl基合金的柱状晶组织的细化效果.
The microstructures of Ti-46Al, Ti-46Al-0.3B, Ti-46Al-0.5B, Ti-46Al-2Fe, Ti-46Al-2Fe-0.3B, and Ti-46Al-2Fe-0.5B alloys solidified on water-cooled copper crucible were investigated.It is found that the as-cast alloys possess a typical columnar structure,and the mean diameters of the columnar grains decrease significantly as the addition of Fe or B.The mean columnar diameter in Ti-46Al-2Fe-0.5B is found to be the smallest among these alloys.B addition can increase the constitutional supercooling in front of the solid-liquid interface,which refines the columnar structure and the dendritic structure.Moreover,Fe addition can enhance the refining effect of boron on the columnar structure of TiAl-based alloys.
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