Metals and Materials

, 3:65 | Cite as

Deformation twinning in TiAl: Effects of defect clustering

  • M. H. Yoo
  • A. Hishinuma


Possible roles of point defect clustering in the formation of deformation twins in γ-TiAl are critically assessed by reviewing the available models of dislocation-assisted twin nucleation and experimental data on deformation twinning in Ti-56 at.% Al single crystals and two-phase Ti-47 at.% Al alloys. According to the pole mechanism for twinning in the Ll0 structure, a reasonable combination of the stress concentration (n≈r27) and the vacancy supersaturation (c/c0≈13) is needed to overcome the critical stages of twin formation. The so-called radiation-induced ductility reported in Ti-47 at.% Al alloys is attributed to the effective formation of twin embryos in the presence of interstitial-type Frank loops and the subsequent nucleation and growth of twins during plastic deformation.


Partial Dislocation Deformation Twinning Line Tension Critical Resolve Shear Stress Pole Mechanism 
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Copyright information

© Springer 1997

Authors and Affiliations

  • M. H. Yoo
    • 1
  • A. Hishinuma
    • 2
  1. 1.Metals and Ceramics DivisionOak Ridge National Laboratoryak PidgeUSA
  2. 2.Department of Materials Science and EngineeringJapan Atomic Energy Research InstituteTokaiJapan

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