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为研究镍基合金Ni75Al11.5V13.5等温时效沉淀颗粒在外应力场作用下的长大,在三元微观相场模型中引入外加应力场,模拟1 046.5 K时效产物L12和D022在外加应力作用下的定向粗化.计算结果表明,微观相场模型可以模拟相结构和晶格中的原子配置,并能清晰地模拟有序相沉淀颗粒间界面.外加应力大小和方向以及持续施加的时间对L12沉淀时效行为有显著影响,施加的外加应力越大、持续时间越长,外加应力方向的定向粗化效应越明显.时效过程中,D022相在L12相与母相界面形核且D022相L12相的间隙中生长,其形态始终受L12相的制约.
In order to study the growth of Ni75Al11.5V13.5 isothermal precipitation particles under the action of external stress field, an applied stress field was introduced into the ternary microscopic phase field model to simulate the effects of the aging products L12 and D022 under the applied stress of 1 046.5 K The results show that the microscopic phase field model can simulate the phase structure and the atomic configuration in the crystal lattice and can clearly simulate the interface between the precipitated particles in the ordered phase.The magnitude and direction of the applied stress and the duration of the applied L12 Precipitation aging behavior has a significant effect, the applied stress is greater, the longer the duration, applied stress direction of the direction of the coarsening effect more obvious.Aging process, D022 phase in the L12 phase and the parent phase interface nucleation and D022 phase L12 phase Of the gap growth, its shape is always subject to L12 phase constraints.