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采用弹性应力-应变有限元方法计算了[011]取向单晶镍基合金中γ/γ′两相共格界面的von Mises应力及应变能密度的分布特征,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:[011]取向单晶镍基合金经热处理后,组织结构是立方γ′相以共格方式嵌镶在γ基体相中,并沿〈100〉方向规则排列.当沿[011]方向施加拉应力时,与近(010)γ′晶面的基体通道相比,近(001)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,与(010)γ′晶面相比较,(001)γ′晶面沿[010]γ′方向发生较大的晶格扩张应变,可诱捕较大半径的Al原子和Ti原子,是促使γ′相沿[001]方向定向生长成为纤维状筏形组织的主要原因.
The distribution characteristics of von Mises stress and strain energy density of γ / γ ’two-phase coherent interface in [011] oriented single crystal nickel-base alloy were calculated by using elastic stress-strain finite element method. The effects of tensile stress on γ / γ ’’ Von Mises ’stress distribution and γ’-phase directional coarsening law were investigated. The results show that: [011] oriented single crystal nickel-based alloy after heat treatment, the structure is cubic γ’ phase in a coherent manner embedded in γ (001) γ ’plane when compared with that of the (010) γ’ plane when a tensile stress is applied in the direction of [011] With larger von Mises stress, larger (001) γ ’crystallographic planes occur along the [010] γ’ direction than the (010) γ ’planes due to the principal stress component Trapping larger radius Al atoms and Ti atoms is the main reason for the directional growth of γ ’phase along [001] direction into fibrous raft structure.