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 distribution of von Mises stress and strain energy density in regions near interfaces of γ/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 of γ' 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 cubical γ' phase embedded coherently in γ matrix, and the cubical γ' 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 promote γ' phase directionally growing along [010] and [100] orientations on (010) plane, this is thought to be the main reason of γ' phase grown directionally into a mesh--like rafted structure along (010) plane.
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