Materials Transactions Online

Materials Transactions, Vol.46 No.08 (2005) pp.1814-1819
© 2005 The Japan Institute of Metals

Electron Irradiation Induced Nano-Crystallization in Fe77Nd4.5B18.5 Metallic Glass

Akihiro Nino, Takeshi Nagase and Yukichi Umakoshi

Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan

Phase transformation behavior in Fe77Nd4.5B18.5 metallic glass during electron irradiation and thermal annealing was investigated. Crystallization from glassy phase during thermal annealing occurred in multi-stages forming α-Fe and several intermetallic compounds. Electron irradiation induced crystallization occurred at 298 K and nanostructure composed of α-Fe, Nd2Fe14B and Fe17B2 precipitates embedded in amorphous matrix was formed. The electron irradiation induced crystallization behavior was discussed by atomic displacement due to electron knock-on effect and atomic diffusion via free volume in amorphous phase.

(Received 2005/4/7; Accepted 2005/6/14; Published 2005/8/15)

Keywords: metallic glass, crystallization, electron irradiation, thermal annealing, nanostrcuture, iron neodymium boron alloy

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