研究了ＤＤＳ镍基高温合金单晶制备中择优生长晶向偏离热流杂晶的长大机制．实验结果表明．在一定条件下择优生长晶向偏离热流方向的晶粒能够淘汰择优生长晶向平行于热流方向的晶粒研究表明，镍基高温合金单晶制备中的晶粒淘汰过程并不取决于择优生长晶向与热流方向平行，而是晶粒枝晶的三维相对位置这很好地解释了高温合金单晶制备时经常发生的预定晶向之外的杂晶长大现象 The growth mechanism of preferential growth in the DDS Ni-based superalloy single crystal was deviated from that of the heat flux. Experimental results show. Under certain conditions, the grain growth direction deviation from the direction of heat flow can eliminate the crystal growth direction parallel to the direction of the crystal grain research shows that the preparation of nickel-based superalloy single crystal preparation process of grain out does not depend on the preferred growth of crystal Parallel to the direction of heat flow, but rather the three-dimensional relative position of the grain dendrites, which is a good explanation of the phenomenon of the growth of miscellaneous grains outside the pre-crystallized direction, which often occurs in the preparation of superalloy single crystals