Ways to Improve Strength of Titanium Alloys by Means of Severe Plastic Deformation

  1. Prof. Dr. Michael Zehetbauer2 and
  2. Prof. Ruslan Z. Valiev3
  1. A.A. Popov

Published Online: 28 JAN 2005

DOI: 10.1002/3527602461.ch15e

Nanomaterials by Severe Plastic Deformation

Nanomaterials by Severe Plastic Deformation

How to Cite

Popov, A.A. (2004) Ways to Improve Strength of Titanium Alloys by Means of Severe Plastic Deformation, in Nanomaterials by Severe Plastic Deformation (eds M. Zehetbauer and R. Z. Valiev), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527602461.ch15e

Editor Information

  1. 2

    Institut für Materialphysik, Universität Wien, Boltzmanngasse 5, 1090 Wien, Austria

  2. 3

    Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marks Str., Ufa, 450 000, Russia

Author Information

  1. Ural State Technical University, UGTU-UPI, Ekaterinburg, Russia

Publication History

  1. Published Online: 28 JAN 2005
  2. Published Print: 25 FEB 2004

ISBN Information

Print ISBN: 9783527306596

Online ISBN: 9783527602469

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Keywords:

  • strength improvement;
  • titanium alloys;
  • severe plastic deformation (SPD);
  • thermostrengthening;
  • ultrafine-grained structure;
  • high pressure torsion (HPT);
  • equal channel angular pressing (ECAP)

Summary

Titanium alloys are regarded as materials with a high strength-to-weight ratio. As a rule, to obtain high-strength characteristics in such alloys, a two-phase structure is formed and precipitation of the second phase, which is comparatively fine-structured, is regulated by means of creating the corresponding dislocation structure in the matrix. At modern industrial facilities the achievable level of hardening for titanium alloys can be as high as 1400–1450 MPa, while in laboratory conditions such alloys can be hardened up to 1500–1600 MPa, with satisfactory plastic characteristics retained [1–2]. Usually, such properties are observed in materials with relatively coarse (30–50 µm) β-grains. When low-alloyed metals are used (with the molybdenum equivalent less than 4–5 %) then the size of relatively globular phases obtained by thermostrengthening is reported to be of 4–5 µm. By forming an ultrafine-grained structure, severe plastic deformation methods, e.g. high pressure torsion (HPT) or equal channel angular pressing (ECAP) [3], should enhance high strength which otherwise would be impossible to obtain by traditional thermomechanical treatment. As this takes place, fatigue characteristics are expected to get improved as well.