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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.
The von Mises stress and strain energy density distribution of γ / γ ’two-phase coherent interface in [111] oriented Ni-based single crystal alloys were calculated by using the elastic-plastic stress-strain finite element method. The von Mises stress distribution and the direction coarsening regularity of γ ’phase at the two phases were studied.The results show that the structure of the [111] orientation Ni-based single crystal alloy is heat treated and the cubic γ’ Phase along the (100) direction.When the tensile strain is applied along the [111] orientation, the (001) γ ’and (100) γ (100) and (001) planes occur in [001], [010] and [010], [100] directions, respectively, under the influence of principal stress components Larger lattices expand strain and trap Al and Ti atoms of larger radius, which is a meshed raft that causes the γ ’phase to grow oriented in the [001] and [100] directions into the lamellar structure on the (010) The main reason for the shape of the organization.