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Strain hardening due to deformation twinning in α-titanium: Mechanisms

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Abstract

Novel experiments were conducted to elucidate the effect of deformation twinning on the mechanical response of high-purity α-titanium deformed at room temperature. Orientation-imaging microscopy (OIM), microhardness, and nanohardness evaluations were employed in conjunction with optical microscopy and quasi-static compression testing to obtain insight into the deformation mechanisms. Hardness measurements revealed that the newly formed deformation twins were harder than the matrix. This observation is perhaps the first experimental evidence for the Basinski mechanism for hardening associated with twinning, arising from the transition of glissile dislocations to a sessile configuration upon the lattice reorientation by twinning shear. This work also provided direct evidence for two competing effects of deformation twinning on the overall stress-strain response: (1) hardening via both a reduction of the effective slip length (Hall-Petch effect) and an increase in the hardness of twinned regions (Basinski mechanism) and (2) softening due to the lattice reorientation of the twinned regions.

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Authors and Affiliations

  1. Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLM, Wright-Patterson AFB, OH

    A. A. Salem (Visiting Scientist)

  2. Universal Technology Corporation, Dayton, OH

    A. A. Salem (Visiting Scientist)

  3. the Department of Materials Science and Engineering, Drexel University, Philadelphia, PA

    S. R. Kalidindi (Professor) & R. D. Doherty (Professor)

  4. Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLM, USA

    S. L. Semiatin (Senior Scientist)

Authors
  1. A. A. Salem
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  2. S. R. Kalidindi
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  3. R. D. Doherty
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  4. S. L. Semiatin
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Salem, A.A., Kalidindi, S.R., Doherty, R.D. et al. Strain hardening due to deformation twinning in α-titanium: Mechanisms. Metall Mater Trans A 37, 259–268 (2006). https://doi.org/10.1007/s11661-006-0171-2

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  • DOI: https://doi.org/10.1007/s11661-006-0171-2

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