In-situ investigations of structural changes during cyclic loading by high resolution reciprocal space mapping

Annika M. Diederichs, Felix Thiel, Ulrich Lienert, Wolfgang Pantleon

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Abstract

Abstract A major failure reason for structural materials is fatigue-related damage due to repeatedly changing mechanical loads. During cyclic loading dislocations self-organize into characteristic ordered structures, which play a decisive role for the materials lifetime. These heterogeneous dislocation structures can be identified using advanced electron microscopy and synchrotron techniques. A detailed characterization of the microstructure during cyclic loading by in-situ monitoring the internal structure within individual grains with high energy x-rays can help to understand and predict the materials behavior during cyclic deformation and to improve the material design. While monitoring macroscopic stress and strain during cyclic loading, reciprocal space maps of diffraction peaks from single grains are obtained with high resolution. High Resolution Reciprocal Space Mapping was applied successfully in-situ during cyclic deformation of macroscopic aluminium samples at the Advanced Photon Source to reveal the structural reorganization within single grains embedded in the bulk material during fatigue.
Original languageEnglish
JournalProcedia Structural Integrity
Volume7
Pages (from-to)268-274
ISSN2452-3216
DOIs
Publication statusPublished - 2017
Event3rd International Symposium on Fatigue Design and Material Defects (FDMD 2017) - Lecco, Italy
Duration: 19 Sep 201722 Sep 2017

Conference

Conference3rd International Symposium on Fatigue Design and Material Defects (FDMD 2017)
CountryItaly
CityLecco
Period19/09/201722/09/2017

Keywords

  • Cyclic deformation
  • Fatigue
  • In-situ x-ray diffraction
  • Reciprocal space mapping
  • Synchroton radiation
  • Aluminium

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