Abstract
Abstract Recently there have been conflicting reports concerning the dissociation scheme of superdislocations in Al3Ti alloyed to the cubic structure. This discrepancy can perhaps be explained by the difficulty of applying invisibility criteria for dislocations imaged under weak beam electron microscope conditions. The present study examines dissociated dislocations under a wide range of imaging conditions to deduce that dissociation by the creation of an antiphase boundary (APB) fault is the scheme operating, at room temperature as well as at high temperature. At the triple-point nodes of intersecting dislocations there are localized regions of superlattice intrinsic stacking faults (SISFs), which allow an estimation of SISF energy for comparison with the APB fault energy. This comparison confirms that dissociation by the creation of an APB fault should be the preferred scheme. After high-temperature deformation many of the superdislocations have their APB on cube planes and remain mobile with no evidenc...
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