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均平行于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3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的速率加快.
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