1. Research & Development Group, Center for Technology Innovation - Materials, Hitachi, Ltd., 7-1-1 Omika, Hitachi 319-1292, Japan
2. Institute
for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
3. Fracture
and Reliability Research Institute, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan
4. WPI
Advanced Institute for Materials Research, Tohoku University, 2-1-1
Katahira, Aoba-ku, Sendai 980-8577, Japan
5. Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1
Katahira, Aoba-ku, Sendai 980-8577, Japan