CAJ | 학술논문

为研究镍基合金Ni75 Al11．5 V13．5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1046．5 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．
위연구얼기합금Ni75 Al11．5 V13．5등온시효침정과립재외응력장작용하적장대，재삼원미관상장모형중인입외가응력장，모의1046．5 K시효산물L12화D022재외가응력작용하적정향조화．계산결과표명，미관상장모형가이모의상결구화정격중적원자배치，병능청석지모의유서상침정과립간계면．외가응력대소화방향이급지속시가적시간대L12침정시효행위유현저영향，시가적외가응력월대、지속시간월장，외가응력방향적정향조화효응월명현．시효과정중，D022상재L12상여모상계면형핵차D022상L12상적간극중생장，기형태시종수L12상적제약．
The externally applied stress was introduced to the microscopic phase field model to study the directional coarsening behaviors of the aging precipitate L12 and D022 of Ni75 Al11.5 V13.5 alloy at 1 046.5 K. The results show that the microscopic phase field model could be used to discover the phase structure, the atom configuration of crystal and the interface between ordered phase precipitate particles. The magnitude,direction and duration of the externally applied stress may obviously influence the aging behavior of the L12 phase. The larger the applied stress and the longer the duration are used, the more obvious the directional coarsening effects become. The D022 phase nucleates along the interface between the L12 phase and the matrix and grows within the spaces among the L12 precipitates. Thus the morphology of D022 phase is always constrained by the L12 phase.