In situ HR-EBSD characterization during micro-mechanical testing

In situ HR-EBSD characterization during micro-mechanical testing

  • Date: Jul 12, 2016
  • Time: 04:00 PM - 05:00 PM (Local Time Germany)
  • Speaker: Dr. Xavier Maeder
  • Empa, Swiss Federal Laboratories for Materials Science and Technology, Thun, Switzerland
  • Location: Max-Planck-Institut für Eisenforschung GmbH
  • Room: Seminar Room 1
  • Host: Prof. Gerhard Dehm
  • Contact: merten@mpie.de
Quantification of the mechanical properties of crystalline materials at micro and nano length-scales is as important as it is challenging. In situ mechanical testing inside the SEM using a micro-indenter offers the great advantage of a direct observation of the progressive deformation in materials and has been applied for many years to assess the deformation mechanisms at small scale. This is now reinforced by the capability of doing in situ EBSD and HR-EBSD in order to map the evolution of the microstructure, the stress field and the GNDs distribution in the materials at several steps during progressive deformation. We apply this technique to estimate the size of the plastic zone underneath the crack tip during micro-cantilever bending in tungsten and NiAl intermetallic for fracture toughness determination. HR-EBSD is used to map the evolution of the stress field around the notch tip and to estimate the GNDs in the plastically deformed zone. In situ EBSD has been also applied to micropillar compression in alpha Titanium in order to study the formation and evolution of compressive twins during the deformation. The results show dislocation driven twin formation and twin propagation and thickening according to the local resolve shear stress.
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