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MeV electron irradiation can introduce irradiation defects in an amorphous phase, resulting in the devitrification (crystallization) of an amorphous phase (amorphous-to-crystal transition) in some metallic glasses, while it can bring about the collapse of the crystalline structure (SSA). The enhancement and stimulation of the thermal crystallization by electron irradiation had been found at 1970s and 1980s [1, 2]. The irradiation induce crystallization at significantly lower temperature than the thermal crystallization temperature (room temperature) was found in Fe88Zr9B3 amorphous alloy [3], and the irradiation induced crystallization was not stimulated by the temperature increase but by the irradiation enhanced diffusion. The irradiation induced crystallization of an amorphous phase in metallic glass with wide supercooled liquid region was also found in Zr-based metallic glasses [4-6], As shown in the review papers [7, 8], a lot of melt-spun metallic glasses were crystallized by electron irradiation at an acceleration voltage of 2.0 MV at room temperature. Irradiation-induced crystallization under MeV electron irradiation with a high dose rate (over 10^23 m-2s-1) is commonly observed in metallic materials.
REFERENCES
[1] J. L. Brimhall, J. Mater. Sci. 19 (1984) 1818-1826.
[2] M. Doi, M. Yoshida, M. Nonoyama, T. Imura, T. Masumoto, Y. Yashiro, Mater. Sci. Eng. 23 (1976) 169-172.
[3] T. Nagase, Y. Umakoshi, N. Sumida, Mater. Sci. Eng. A 323 (2002) 218-225., http://dx.doi.org/10.1016/S0921-5093(01)01351-X
[4] T. Nagase, Y. Umakoshi, Sci. Tech. Adv. Mater., 3, 119 (2002)., http://dx.doi.org/10.1016/S1468-6996(02)00013-X
[5] T. Nagase, Y. Umakoshi, J. Appl. Phys., 93, 912-918 (2003)., http://dx.doi.org/10.1063/1.1529073
[6] T. Nagase, Y. Umakoshi, Mater. Trans., 45, 13-23 (2004)., http://www.jim.or.jp/journal/e/45/01/13.html
[7] T. Nagase: Advanced materials design by irradiation of high energy particles, in: Progress in Advanced Structural and Functional Materials Design, Ed., T. Kakeshita, Springer, 2013. pp. 137-153. ISBN 978-4-431-54063-2, http://www.springer.com/materials/structural+materials/book/978-4-431-54063-2
[8] T. Nagase, T. Sanda, A. Nino, W. Qin, H. Yasuda, H. Mori, Y. Umakoshi, J.A. Szpunar, J. of Non-Cryst. Solids, 358, 502-518 (2012)., http://dx.doi.org/10.1016/j.jnoncrysol.2011.11.010
