کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1620698 | 1516385 | 2010 | 10 صفحه PDF | دانلود رایگان |
An electron microscopic analysis of the dislocation structure of the Ti3Al 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 2c + 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 2c + a superdislocations in pyramid planes are discussed considering results of the computer simulation of the superdislocation core structure in Ti3Al.
Journal: Journal of Alloys and Compounds - Volume 494, Issues 1–2, 2 April 2010, Pages 223–232