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Journal of Electron Microscopy 47(5): 461-470 (1998)
© 1998 Oxford University Press

Formation process of the amorphous MgNi by mechanical alloying

Ken-ichi Yamamoto1,*, Yoshinori Fujikawa2,**, Kazutaka Ikeda3, Shin-ichi Orimo3, Hironobu Fujii3 and Yasuyuki Kitano4

1Hiroshima Prefectural Joint Research Center for Advanced Technology 3-13-26, Kagamiyama, Higashi-Hiroshima 739-0046, Japan
2Department of Materials Science, Hiroshima University 1-7-1, Kagamiyama, Higashi-Hiroshima 739-8521, Japan
3Faculty of Integrated Arts and Sciences, Hiroshima University 1-7-1, Kagamiyama, Higashi-Hiroshima 739-8521, Japan
4Department of Materials Science, Shimane University 1060, Nishi-kawatsu-cho, Matsue 690-8504, Japan

*To whom correspondence should be sent at Technical Research Center, Mazda Motor Corporation, 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima 730-8670, Japan. E-mail: yamamoto.ken{at}lab.mazda.co.jp

To clarify the formation process of amorphous MgNi (a-MgNi) by mechanical alloying (MA), we have investigated the time evolution of structural changes of the alloy, Mg-50 at.%Ni, synthesized from Mg2Ni and Ni powders under various MA-times. The amorphous-like phase in the powder particle of the alloy increases with increasing MA-time, and the almost single a-MgNi phase is formed after 288 ks of MA-time. At an earlier stage in MA, the crystals of Mg2Ni are nanostructured, and the nanostructured Mg2Ni (n-Mg2Ni) and Ni are kneaded with each other in the powder particles. With increasing MA-time, the n-Mg2 region containing Ni kneaded has increased and transformed to the amorphous-like phase. From the observation of high-resolution transmission electron microscopy (HRTEM), it has been made clear that the nucleation of amorphization in the alloy occurs on the interface between n-Mg2Ni and Ni regions and progresses toward the inside of the n-Mg2Ni region.

Keywords     hydrogen storage, amorphous, nanocrystal, mechanical alloying, focused ion beam (FIB), transmission electron microscopy (TEM)

Received     17 October 1997, accepted 26 May 1998


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