Microstructure and creep behavior of A 9%W single crystal nickel-based superalloy

摘要: By means of the measurement creep curves and microstructure observation, an investigation has been made into evolution behaviors 9%W single crystal nickel-base superalloy. Results show that alloy displays obvious sensibility on applied stress when is more than 160 MPa at 1040 °C. In ranges temperatures stresses, apparent activation energy measured to be about 465 kJ/mol. initial stage creep, cubical γ′ phase in transformed N-type rafted structure along direction vertical axis, deformed mechanism during steady state dislocations climbing over phase, dislocation shearing thought later creep. After crept up fracture, various morphology displayed different regions sample, axis region far from but coarser twisted detected near which attributed bigger plastic deformation occurred fracture.