Abstract
An electron microscopic analysis of the dislocation structure of the Ti 3Al intermetallic after high-temperature deformation is performed. It is found that the microstructure of the samples deformed at T = 1073–1173 K contains mobile a and 2 c + a superdislocations. Dislocation configurations including a superstructural intrinsic stacking faults are revealed after deformation at T = 1273 K. A scheme of formation of these configurations by the interaction of a superdislocations in the basal and prism planes is proposed. Glissile dislocations with the Burgers vector [0 0 0 1] in prism planes and superdislocations with the Burgers vectors 1 / 3 〈 2 1 ¯ 1 ¯ 3 〉 and 1 / 3 〈 0 1 ¯ 1 3 〉 are observed at T = 1273 K. Possible models of the barrier destruction on 2 c + a superdislocations in pyramid planes are discussed considering results of the computer simulation of the superdislocation core structure in Ti 3Al.
Published Version
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