A study of stress relaxation in AZ31 using high-energy X-ray diffraction

W. Tang, K. L. Halm, D. R. Trinkle, M. K.A. Koker, U. Lienert, P. Kenesei, A. J. Beaudoin

Research output: Contribution to journalArticlepeer-review

Abstract

The micro-plasticity of the Mg alloy AZ31 is explored through high-energy X-ray diffraction (HEXD). Through cyclic loading of the sample, a softening response is found to follow the resolved shear stress for basal slip. Stress relaxation is studied by applying an incremental elongation increase while continuously collecting images from a detector array. The rate exponent associated with a particular reflection is developed by evaluating the average lattice strain in the loading direction from the composite detector image collected at a particular point in time, and then following the time evolution. A distinct rate exponent is identified for grain orientations that have a propensity for slip on second-order pyramidal planes, highlighting the capability to capture the simultaneous action of different deformation mechanisms through HEXD.

Original languageEnglish (US)
Pages (from-to)71-79
Number of pages9
JournalActa Materialia
Volume101
DOIs
StatePublished - Dec 1 2015

Keywords

  • Cyclic micro-plasticity
  • High-energy X-ray diffraction
  • Mg alloy
  • Plasticity
  • Stress relaxation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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