Abstract
An electron microscopical investigation of the growth and elastic accommodation of θ′ plates is described for specimens aged above the θ′ solvus. It is concluded that both vacancy and interstitial plates can form as defined by the plates' residual misfit in the C direction. This misfit is not constant during particle thickening but is subject to periodic variations in magnitude and sign, even before accommodation of the residual misfit of the thicker plates by the nucleation or capture of dislocations. It is suggested that in general the system's flexibility in being able to use different multiples of half unit cells of the θ′ structure allows the elastic misfit to be minimised for a given plate thickness.
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