对一种镍基单晶高温合金在两种蠕变条件下(760℃/780 MPa 和 982℃/248 MPa)的变形机制进行分析. 结果表明: 在中温高应力条件下(760℃/780 MPa), 在低应变阶段,位错以堆垛层错的形式切入γ’相; 高应变阶段, 位错以位错对的方式切入γ'相. 在高温低应力条件下(982℃/248 MPa)的低应变阶段, 母相 a/2<110>位错在基体中运动弓出, 并绕过γ'相, 发生位错反应而形成位错网; 高应变阶段与中温高应力条件的切入机制相同.
The creep deformation mechanisms of a Ni base single crystal superalloy at 760℃/780 MPa and 982℃/248 MPa were studied by a transmission electron microscopy (TEM). The results show that under moderate temperature and high stress (760℃/780 MPa), the γ' phase is sheared through dissociation of matrix dislocation, leaving a stacking fault at low strain stage; while at high strain stage, the γ' phase is cut by dislocation pairs. Under high temperature and low stress (982℃/248 MPa), the deformation is based on the movement of dislocations in the matrix, bowing of the matrix dislocations between the γ' precipitates and dislocation reacting to form the dislocation networks at low strain stage; while at high strain stage, the γ' phase is cut as that of 760℃/780 MPa
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