Affiliation: | aDept. of Metall. and Mater. Sci., Hanyang University, Ansan, Kyunggi-Do 425-791 Korea bCenter for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang 790-784 Korea cDept. of Metall. and Mater. Sci., Hongik University, Seoul 121-791, Korea |