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Phys. Rev. Lett. 102, 045503 (2009) [4 pages]

Reversible Movement of Homogenously Nucleated Dislocations in a beta-Titanium Alloy

J. P. Cui, Y. L. Hao, S. J. Li, M. L. Sui, D. X. Li, and R. Yang
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
Received 2 December 2008; published 29 January 2009

We demonstrate reversible movement of (1/2)[1[overline 1]0](110) dislocation loops generated from nanodisturbances in a beta-titanium alloy. High resolution transmission electron microscope observations during an in situ tensile test found three reversible deformation mechanisms, nanodisturbances, dislocation loops and martensitic transformation, that are triggered in turn with increasing applied stress. All three mechanisms contribute to the nonlinear elasticity of the alloy. The experiments also revealed the evolution of the dislocation loops to disclination dipoles that cause severe local lattice rotations.

©2009 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.102.045503
DOI: 10.1103/PhysRevLett.102.045503
PACS: 62.20.D-; 61.82.Bg; 68.35.Rh; 68.37.Og
  • 62.20.D-
    Elasticity of solids
  • 61.82.Bg
    Radiation effects on metals and alloys
  • 68.35.Rh
    Phase transitions and critical phenomena (solid surfaces/interfaces)
  • 68.37.Og
    High-resolution transmission electron microscopy (HRTEM) of surfaces, interfaces and thin films
  • YEAR: 2009

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