1. Department of Materials Science and Engineering, Kyushu University, Fukuoka, Japan
2. Department of Mechanical Engineering and Materials Science, Yokohama National University, Yokohama, Japan
3. Japan Synchrotron Radiation Research Institute (JASRI), Hyogo, Japan
4. Department of Physics, Arizona State University, Tempe, AZ, USA
5. Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu, Japan
6. Magnesium Research Center, Kumamoto University, Kumamoto, Japan
7. Synchrotron Light Application Center, Saga University, Saga, Japan