Elsevier

Scripta Materialia

Volume 142, 1 January 2018, Pages 96-100
Scripta Materialia

Regular Article
Measuring Ti-7Al slip system strengths at elevated temperature using high-energy X-ray diffraction

https://doi.org/10.1016/j.scriptamat.2017.08.029Get rights and content

Abstract

Full stress tensors of over four hundred individual grains in a titanium alloy specimen (Ti-7Al) are tracked during continuous uniaxial deformation through the elasto-plastic transition at 355°C. The experiment is facilitated by a unique radiative heating furnace and load frame designed for in-situ high-energy X-ray diffraction measurements. Average strengths of multiple slip system families are calculated directly from the ensemble grain stress data. Results show that elevated temperature lowers the strength of basal slip systems relative to prismatic slip systems, reduces the degree of flow softening due to precipitate shearing, and decreases the first-order pyramidal slip system work-hardening rate.

Section snippets

Acknowledgments

The authors would like to thank Dr. Adam Pilchak for providing the Ti-7Al material. The work of JVB was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Support from the Materials and Manufacturing Directorate of the U.S. Air Force Research Laboratory is acknowledged. This work is based upon research conducted at the Cornell High Energy Synchrotron Source (CHESS) which is supported by the National Science

References (31)

  • C. Tomé et al.

    Acta Metall.

    (1985)
  • V. Hasija et al.

    Acta Mater.

    (2003)
  • G. Lutjering

    Mater. Sci. Eng. A

    (1998)
  • D.C. Pagan et al.

    Acta Mater.

    (2017)
  • L. Wang et al.

    Acta Mater.

    (2017)
  • A.L. Pilchak

    Scr. Mater.

    (2013)
  • A. Fitzner et al.

    Acta Mater.

    (2016)
  • T. Neeraj et al.

    Mater. Sci. Eng. A

    (2001)
  • T. Neeraj et al.

    Acta Mater.

    (2000)
  • S. Schmidt et al.

    Scr. Mater.

    (2008)
  • N.Y. Juul et al.

    Scr. Mater.

    (2016)
  • U. Kocks et al.
  • D. Ozturk et al.

    Fatigue Fract. Eng. Mater. Struct.

    (2016)
  • N.R. Barton et al.

    Model. Simul. Mater. Sci. Eng.

    (2001)
  • Z. Zhang et al.

    Proc. R. Soc. Lond. A Math. Phys. Eng. Sci.

    (2015)
  • Cited by (56)

    View all citing articles on Scopus
    View full text