Influence of Grain Size on the Ductility of Age-Hardened Titanium Alloys

  • A. Gysler
  • G. Terlinde
  • G. Lütjering


In precipitation hardened alloys in which the moving dislocations are able to shear the particles pronounced slip bands are formed at the beginning of plastic deformation. With increasing volume fraction of precipitated particles such alloys often show a drastic reduction in macroscopic ductility. The reason for this brittle behavior is the high stress concentration at the head of dislocation pile-ups causing the fracture of grain boundaries by intersecting slip bands (1–3). The main purpose of the present work was to investigate how a reduction in grain size and therefore a decreasing number of piled-up dislocations within the slip bands may influence the ductility of those alloys. The investigation was mainly performed on two binary Ti-alloys, namely on ß-Ti-Mo and a-Ti-Al, because the details of deformation behavior and crack nucleation mechanisms are already known for these alloys (1,2).


Aging Time Slip Band Crack Nucleation True Fracture True Strain Curve 
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  1. (1).
    Gysler A., Lütjering G., Gerold V.; “Deformation Behavior of Age-Hardened Ti-Mo Alloys”; Acta Met. 22 (1974) 901–909CrossRefGoogle Scholar
  2. (2).
    Lütjering G., Weissmann S.; “Mechanical Properties of Age-Hardened Titanium-Aluminum Alloys”; Acta Met. 18 (1970) 785–795CrossRefGoogle Scholar
  3. (3).
    Lütjering G.; “Slip Distribution and Mechanical Properties of Metallic Materials”; DLR-FB 74–70 (1974) 1–141; ESRO TT (1976)Google Scholar
  4. (4).
    Welsch G., Lütjering G., Gazioglu K., Bunk W.; “Deformation Characteristics of Age-Hardened Ti-6A1–4V”; submitted to Met. Trans.Google Scholar
  5. (5).
    Hirth J. P., Lothe J.; “Theory of Dislocations”, Mc Graw-Hill Book Company (1968) 694–718Google Scholar

Copyright information

© Springer Science+Business Media New York 1982

Authors and Affiliations

  • A. Gysler
    • 1
  • G. Terlinde
    • 2
  • G. Lütjering
    • 2
  1. 1.Institute for Materials ResearchGerman Aerospace Research Establishment (DFVLR)CologneWest-Germany
  2. 2.Institute for Materials ScienceRuhr-University BochumBochumWest-Germany

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