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Ｔｉ５５ 高温钛合金在缓冷（１０００ ｋｇ 铸锭冒口） 条件下， 正常凝固区中稀土相呈弥散分布状态，初始补缩区中稀土相聚集成团， 正常补缩区中稀土相颗粒沿平行于凝固界面方向规则排列； 在快冷（ 锤砧薄片） 条件下， 稀土相除弥散分布在合金中外， 出现稀土相颗粒排列成行的现象。两种凝固条件下均出现颗粒规则排列现象的原因是凝固界面的平面长大。
Under the conditions of slow cooling (1000 kg ingot riser), the rare earth phase in the normal solidification zone is in a diffusive state, the rare earth phase aggregates into lumps in the initial feeding zone, and the grain boundaries of the rare earth phase in the normal feeding zone Parallel to the direction of the solidification interface regularly arranged; in the fast cooling (hammer anvil thin film) under the conditions of rare earth dispersed in addition to the alloy, the emergence of rare earth particles arranged in rows phenomenon. The reason for the regular arrangement of particles in both solidification conditions is that the plane of the solidified interface grows.