Abstract
Zr3Al is an ordered f.c.c. alloy of the Ll2 type which forms via a peritectoid reaction. It has not been possible to disorder Zr3Al by quenching and no antiphase domain boundaries have been observed, in either annealed or quenched material which indicates that Zr3Al is normally present in a highly ordered state. In deformed Zr3Al the superlattice dislocations were observed to be extended i.e. they consisted of intrinsic stacking faults on {111} bounded by partial dislocations (figure 1). The total Burgers vector is of the type <110> and the superlattice dislocations have dissociated as follows:. The Burgers vectors were determined using the criterion that the partial dislocations will be out of contrast for g.b = 0, ± 1/3 as well as for g.b = -2/3 when s > 0.During high temperature annealing of the deformed material, dislocation networks were produced in which all of the dislocation nodes were extended: hence intrinsic (I) and extrinsic (E) stacking faults must alternate at the nodes (figure 2).
Published Version
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