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金属学报  2006 

抽拉速率对Ti-43Al-3Si合金籽晶法定向凝固组织的影响

, PP. 1238-1242

Keywords: TiAl,定向凝固,抽拉速率,籽晶法

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Abstract:

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,60mm/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.

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