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*Yusuke Nakahata
Joing and Welding Research Institute, Osaka
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Soshu Kirihara
Joing and Welding Research Institute, Osaka
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Yoshinari Miyamoto
Joing and Welding Research Institute, Osaka
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Mituo Takeda
Faculty of Science, Shinshu University
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Katsuya Hond
Faculty of Science, Shinshu University
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Kazuaki Sakota
National Institute for Materials Science