Abstract
Abstract The dislocation structures and dissociation modes of superdislocations in L12-modified A167Fe8Ti25 deformed at room temperature and 600[ddot]C were investigated by means of transmission electron microscopy. It was revealed that in samples deformed at room temperature, dislocations dissociated into two (a/3) superpartials separated by superlattice intrinsic stacking faults on {111} planes with a strong tendency to form dipoles. In samples deformed at 600[ddot]C, dislocations dissociated into two (a/2) superpartials separated by antipnase boundaries on the cube {001} planes, predominantly with near-edge character. The factors controlling the plastic behaviour and brittleness of the L12-modified Al3Ti at low and high temperatures are discussed in relation to the observed dissociation modes of superdislocations in this material.
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