中文摘要：

采用弹塑性应力-应变有限元方法计算了[111]取向镍基单晶合金中γ/γ′两相共格界面的von Mises应力及应变能密度分布,研究了施加拉应力对γ/γ′两相界面von Mises应力分布及γ′相定向粗化规律的影响.结果表明：[111]取向镍基单晶合金经热处理后,组织结构是立方γ′相以共格方式嵌镶在γ基体相中,沿（100）方向规则排列.当沿[111]取向施加拉应力蠕变期间,与近（010）γ′晶面的基体通道相比,近（001）γ′和（100）γ′晶面的基体通道有较大的von Mises应力,在主应力分量的作用下,（100）和（001）晶面分别沿[001],[010]和[010],[100]方向发生较大的晶格扩张应变,可诱捕较大半径的Al和Ti原子,这是促使γ′相在（010）面沿[001]和[100]方向定向生长成为层片结构的筛网状筏形组织的主要原因.

英文摘要：

The distribution of von Mises stress and strain energy density in regions near interfaces ofγ/γ＇ phases was calculated by an elastic-plastic stress-strain finite element method （FEM）,and the influences of applied stress on the von Mises stress distribution and coarsening regularity ofγ＇ phase in a[111]oriented single crystal nickel-based superalloy were also investigated. The results show that,after heat treated,the microstructure of the[111]oriented single crystal superalloy consists of a cubicalγ＇ phase embedded coherently inγmatrix,and the cubicalγ＇ phase is regularly arranged along（100） direction.When tensile stress is applied along[111] direction,compared to（010）_γ＇ plane,larger expanding lattice strain occurs on（100）_γ＇ and（001）_γ＇ planes under the action of principal stress component,which may trap Al,Ti atoms with bigger radius to promoteγ＇ phase directionally growing along[010]and[100]orientations on（010） plane, this is thought to be the main reason ofγ＇ phase grown directionally into a mesh-like rafted structure along（010） plane.