Analysis of<i>in situ</i>shearing mechanisms of γ′ precipitates in a nickel-based superalloy at 1120 K

Abstract

Abstract L12 precipitate shearing processes by (a/3)〈112〉 dislocations during in situ straining of a superalloy in a transmission electron microscope are reported. Information about the core structure of such dislocations is obtained from the way they split when they get out of a precipitate. We conclude that a further dissociation into two identical Shockley partials occurs.