Microstructural characterization of α2 + B2 titanium aluminide intermetallic (Super-α2) using transmission electron microscopy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)193-203
Journal / PublicationMaterials Science and Engineering A
Issue number2
Publication statusPublished - Dec 1990
Externally publishedYes


Dislocation structures in as-received and plastically deformed commercial α2 + B2 and homogeneous ordered B2 intermetallic titanium aluminide alloys ("super-α2") were characterized with transmission electron microscopy. Thin foils prepared by twin-jet electropolishing and ion beam thinning were found to yield different deformation structures. Electropolished foils were found to contain lath-like bands of dislocation loops with 12〈111〉 Burgers' vectors (b) in the B2 phase that were actually thinning artifacts. Dislocations in lightly deformed ion-beam-thinned foils appeared to be predominantly screw dislocations with b = 12〈111〉.