Abstract
This paper is aimed at clarifying the effects of the anisotropy of the anti-phase boundary (APB) energy on the yield-stress anomaly (YSA) of five distinct Ni3(Ti, Nb) single crystals with various long-period ordered structures, in which the APB energy on the non-close-packed (non-CP) plane varies with changes in the stacking sequence of the close-packed planes. The APB energies of interest are estimated, based on a pair-wise interaction parameter model to the second neighbour. The YSA can be categorized in two groups of two and three compounds, within which the mechanical properties are nearly independent of composition. The microstructures resulting from deformation at 700°C were compared. It is verified that the YSA is dominantly controlled by differences in the probability of locking by a Kear–Wilsdorf mechanism, which itself is governed by the anisotropy of APB energy in the non-CP planes relative to the primary slip plane.
Published Version
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