Characterization of Damage in Magnesium Using Digital Image Correlation and Electron Backscattered Diffraction Patterning

The microscopic strain distribution of commercially pure magnesium has been investigated during room temperature deformation. Digital image correlation (DIC) coupled with electron backscattered diffraction (EBSD) patterning has been used to relate strain measurements with the microstructure. Sheet magnesium tensile samples were etched and a random pattern of points were machined onto the sample surface using a focused ion beam (FIB). The samples were pulled in tension under an optical microscope. Images were obtained in increments and the DIC method was used to calculate the strain distribution. The strain distribution was compared to the EBSD pattern and the results show that strain localization is associated with twin and grain boundaries.