Effect of Mo Addition on the Formation of Metastable fcc Zr_2Ni and Icosahedral Phases in Zr-Al-Ni-Cu Glassy Alloy : Structure and Mechanical and Thermal Properties of Condensed Matter

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We investrgated the transformation behavior at the initial crystallization stage in the Zr Al Ni-Cu-Mo glassy alloy. In the Zr_<65>Al_<7.5>Ni_<10>Cu_<12,5>Mo_5 alloy, the crystallization reaction changes to two reactions and the first reaction corresponds to the nanoscale fcc Zr2Ni phase formation. The two-stage crystallization reaction is also observed in the Zr_<65>Al_<7.5>Ni_5Cu_<17.5>Mo_5 alloy, where the primary phase is the nanoscale icosahedral quasicrystalline phase. The difference in the primary phase between the two alloys is attributed to the difference in the chemical affinities of Mo with Cu and Ni. The formation of nanoscale icosahedral and fcc Zr_2Ni phases leads to the hypothesis that the icosahedral short-range order exists in the glassy state of the Zr-Al-Ni-Cu alloy as a unit structure in both phases.
社団法人応用物理学会の論文
2001-07-15