Creep deformation mechanism in a Ni base single crystal superalloy
LIU Lirong; JIN Tao; ZHAO Nairen; WANG Zhihui; SUN Xiaofeng;GUAN Hengrong; HU Zhuangqi
Institute of Metal Research; The Chinese Academy of Sciences; School of Materials Science and Engineering; Shenyang University of Technology
Cite this article:
LIU Lirong; JIN Tao; ZHAO Nairen; WANG Zhihui; SUN Xiaofeng; GUAN Hengrong; HU Zhuangqi. Creep deformation mechanism in a Ni base single crystal superalloy. Acta Metall Sin, 2005, 41(11): 1215-1220 .
Abstract 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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