Evaluation of Dislocation Density in a Mg-Al-Mn-Ca Alloy Determined by X-ray Diffractometry and Transmission Electron Microscopy

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  • Shintani Takashi
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Murata Yoshinori
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Terada Yoshihiro
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Morinaga Masahiko
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

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Metallic materials suffering deformation store elastic strain. Evaluation of this strain energy is important for understanding the mechanical and physical properties of the materials. Although direct evaluation of the stored energy is difficult, it can be evaluated by determining the defect energy of dislocations induced by the deformation. Thus, a practicable method of evaluating the strain energy is to measure the dislocation density in metallic materials. The average and representative dislocation density can be estimated by X-ray diffraction (XRD) analysis. We have estimated the dislocation density of a magnesium alloy with hexagonal crystals by a modified Warren–Averbach analysis based on a modified Williamson–Hall plot using XRD profiles. The dislocation density value obtained by this method agrees with those reported previously. We found that the modified Warren–Averbach method is still a powerful method for evaluating the dislocation density in hexagonal crystals.

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