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金属学报  2011 

镍基双晶高温合金定向凝固过程中的竞争生长

, PP. 641-648

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Abstract:

研究了镍基双晶高温合金定向凝固过程中的竞争生长。实验结果表明,当原始籽晶一次枝晶方向都平行热流方向且二次枝晶取向不同时,定向凝固过程中双晶共存,但双晶的界面存在波动,抽拉速率对其影响不大。当原始籽晶一次枝晶([001])异面并保持其中一组二次枝晶取向([010])相同时,双晶竞争生长过程是一个三维竞争生长过程。晶粒竞争生长从三个方向同时进行,择优取向晶粒通过螺旋状生长方式淘汰非择优取向晶粒,双晶竞争生长过程与抽拉速率密切相关,随着抽拉速率的增加,择优取向晶粒淘汰非择优取向晶粒速率加快。

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