These transmission electron micrographs illustrate the shearing of γ' precipitates in a γ matrix of a nickel based superalloy. The micrographs have been reproduced with the permission of Dr Rob Mitchell, Cambridge University.
The passage of a dislocation through a precipitate leaves a step equal to the Burgers vector of the dislocation. |
γ' precipitates in a nickel based superalloy. There are two size distributions. Some of the larger particles have been sheared by the passage of dislocations. |
γ' precipitates in a nickel based superalloy. There are two size distributions. Some of the larger particles have been sheared by the passage of dislocations. |
The size of the steps is much greater than one Burgers vector, indicating the slip gets localised; it becomes easier to continue slipping on the same plane as the slip step grows. |
