Banerjee, D. ; Gogia, A. K. ; Nandy, T. K. (1990) Deformation structure in a Ti-24Al-11Nb alloy Metallurgical and Materials Transactions A, 21 (2). pp. 627-639. ISSN 1073-5623
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Official URL: http://www.springerlink.com/content/a87029n12nn120...
Related URL: http://dx.doi.org/10.1007/BF02671934
Abstract
A Ti-24Al-11Nb alloy has been heat-treated so as to obtain a microstructure of coarse α2 particles (D019 structure based on Ti3Al) in a matrix of the ordered βo phase (B2 structure based on Ti2AlNb). Dislocation structures generated by tensile strains of ~2 pct at room temperature have been analyzed by transmission electron microscopy The βo phase is shown to deform inhomogeneously on {110}, {112}, and {123} planes by α/ < 211 > slip. The slipband structure is complex, consisting of segments of heavily pinned edge dislocations with periodic cross slip of screw components on to secondary slip planes. Incompatibility stresses at α2/βo interfaces can generate fine α[100] slip as well. The α2 phase deforms independently by α dislocation slip. Slipbands in the βo phase can shear the α2 phase by activating c +α/2 slip on {22̅0} and {224̅2} slip planes, as well as α slip on higher order pyramidal planes, where the parallelism of the specific slip system is permitted by the Burgers relationship between the two phases.
Item Type: | Article |
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Source: | Copyright of this article belongs to The Minerals, Metals & Materials Society. |
ID Code: | 62993 |
Deposited On: | 24 Sep 2011 15:11 |
Last Modified: | 24 Sep 2011 15:11 |
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