Deformation structure in a Ti-24Al-11Nb alloy

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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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 α2o 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
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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