以Ti-43Al-3Si为籽晶, 研究了不同抽拉速率对TiAl合金籽晶法定向凝固全片层组织的影响. 结果表明, 60 mm/h抽拉速率下, 凝固组织中的片层方向能够与生长方向保持一致. 随抽拉速率增加, 由于温度梯度降低、成分过冷增大等因素的影响, 凝固组织中出现了与生长方向成45或90夹角的片层取向. 电磁搅拌引起的强制对流使固/液界面前沿的扰动不断增强, 晶体生长形态发生变化, 破坏了片层取向的一致性.
Directional solidification (DS) of Ti-46Al and Ti-43Al-3Si alloys using a polycrystalline seed material of Ti-43Al-3Si by self-made EMCS experimental apparatus with wide range of velocity has been studied. Successful DS ingots were obtained with fully lamellar microstructure parallel to longitudinal axis when the growth rates increased from 60 to 120mm/h. The ingot grown at 60mm/h exhibited typical lamellar microstructure aligned along the growth direction from the seed crystal up to the end part of ingot. On the contrary, as the growth rate increased, the orientation of lamellar microstructure changed beyond the transition point.
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