Formation, Thermal Stability and Mossbauer Effect of Amorphous, Quasicrystalline and Crystalline Phases in Al-(Cu, Ni)-Fe Systems

概要

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Nonequilibrium phase including amorphous and bcc phases in Al-Cu-Fe and Al-Ni-Fe systems formed by sputtering method. The composition range of the formation phases are determined, in harmony with that of the binary Al-transition system. The composition range (Ni=10〜15 at%, Fe=10〜15 at%) of melt-quenched quasicrystalline phase is the formation region of an amorphous phase in a vapor quenched state. In the investigation for Al_<73>Ni_<10>Fe_<17> alloy, two exothermic peaks in calorimetric curves are observed during heating. The first peak is correlated with the precipitation of bcc-like nanocrystalline from vapor-quenched amorphous matrix, and the second peak is due to formation of decagonal phase. The Mossbauer spectra of these vapor-quenched nonequilibrium phases are examined and it is concluded that the local structure around Fe atom is similar among icosahedral, decagonal, amorphous and bcc phases.
東北大学の論文
1992-03-25