研究了螺旋段在选晶过程中的作用.基于金相及EBSD实验结果,指出在晶粒竞争生长过程中,晶粒二次臂取向和初始位置分布特征综合决定了晶粒的竞争优势.总结提出了选晶过程的两个几何限制机理:水平方向的二次臂竞争促进作用和竖直方向的一次臂限制作用.两种模型成功解释了螺旋段对选晶过程的作用.采用修正的元胞自动机(MCA)技术,对螺旋段的晶粒竞争生长过程进行了模拟.研究了晶粒结构及晶体取向随定向凝固过程的变化规律,并与实验结果进行了对比,两者吻合较好.基于模拟与实验的研究,获得了螺旋参数对选晶行为的影响规律及作用机理,提出了选晶器螺旋段的设计准则.
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