【摘要】 对[001]取向单晶镍基合金的恒温拉伸蠕变组织形貌的TEM观察表明，蠕变初期，基体γ相八面体滑移系中两组1／2＜110＞位错运动至同一晶面相遇，发生反应形成三维节点的位错网络；稳态期间，基体中运动位错可通过界面位错网攀移越过筏状γ相；蠕变后期形变的特征是运动位错在位错网损坏处切入筏状γ相内更多还原

【Abstract】 The microstructures for a single crystal nickel-base superalloy with [001] orientation,after tension load at 1040℃ under 120 MPa for various creep time, were observed by measns of TEM.The results showed that the three-dimenision dislocation networks on the γ/γ phase intedsces were formed by the dislocation reaction when two sets dislocations with difFerent Burgets vectors meet during primary creep. The motion dislocations in the 7 matrix may climb over the rafts γ’ phase by means of the dislocation networks during steady creep. In latter stage of creep, the deformation feature is the moving dislocations shearing into the rafts γ’ phase on the γ’/γ phase interfaces where the dislocation networks were damaged.更多还原