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Experimental study of dislocation mobility in a Ti–6Al–4V alloy

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
55
Issue
18
Identifiers
DOI: 10.1016/j.actamat.2007.07.032
Keywords
  • Titanium Alloys
  • Transmission Electron Microscopy (Tem)
  • Dislocation Dynamics
  • In Situ
  • Tension Test

Abstract

Abstract By in situ TEM deformation experiments, we studied in detail the deformation micromechanisms of a Ti–6Al–4V alloy at room temperature. All dislocations have an a-type Burgers vector and glide essentially in prismatic or basal planes. They are first emitted from α/β interfaces and take a preferential orientation along their screw direction. The motion of screw dislocations controls the strain rate. Our experiments allow the microscopic parameters of plasticity for this alloy to be determined for the first time. The results concerning the screw dislocation motion, its core structure and the influence of interfaces are then discussed in comparison with previously published results.

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