Ｎｉ基单晶高温合金中的固态枝晶γ＇具有以［１１１］为择优取向的八个枝轴为一体的三维形貌特征．在其它处理条件相同，唯时效时间不同的情况下，时效初期的枝晶γ＇表面随着时间的延长发生由外及里的分裂，其上γ＇的尺寸也随之由大变小，分析原因与弹性畸变能的释放有关分裂过程在１ｈ内完成时效后的枝晶γ＇表现为由众多个按一定取向排列的小方γ＇包围而成．固态枝晶γ＇按照台阶机制长大，时效初期弹性畸变能起主要作用，而后期则是浓度梯度差异的影响。 The solid state dendritic γ ’in the Ni-based single crystal superalloy has the three-dimensional topography with the eight major axes [111] as the preferred orientation. Under the same conditions of other treatments and only different aging time, the dendritic γ ’surface at the initial stage of aging evolves from outside to inside with the extension of time, the size of γ’ The reason is related to the release of elastic distortion energy. The dendrite γ ’after the splitting process is completed within 1 h is surrounded by a large number of small square γ’ arranged in a certain orientation. The solid dendritic γ ’grows according to the step mechanism, and the elastic distortion can play a major role in the initial aging, while the latter is the effect of the difference in concentration gradient.