TY - JOUR
T1 - Formation process of the amorphous MgNi by mechanical alloying
AU - Yamamoto, Ken Ichi
AU - Fujikawa, Yoshinori
AU - Ikeda, Kazutaka
AU - Orimo, Shin Ichi
AU - Fujii, Hironobu
AU - Kitano, Yasuyuki
N1 - Funding Information:
. , 1j *• ACKnOWledgementS This work was financially supported by the Japan Science and Technology Corporation as well as by the Hiroshima Prefecture. The authors wish to thank Dr T. Kamino and Ms T. Yaguchi of the Hitachi Techno Research, for their advise on the FIB thinning technique.
PY - 1998
Y1 - 1998
N2 - 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-Mg2Ni 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.
AB - 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-Mg2Ni 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.
KW - Amorphous
KW - Focused ion beam (FIB)
KW - Hydrogen storage
KW - Mechanical alloying
KW - Nanocrystal
KW - Transmission electron microscopy (TEM)
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U2 - 10.1093/oxfordjournals.jmicro.a023617
DO - 10.1093/oxfordjournals.jmicro.a023617
M3 - Article
AN - SCOPUS:0031797657
SN - 2050-5698
VL - 47
SP - 461
EP - 470
JO - Microscopy (Oxford, England)
JF - Microscopy (Oxford, England)
IS - 5
ER -