Structural Study of Amorphous Alloys with a Wide Supercooled Liquid Region by the Anomalous X-ray Scattering (AXS) Method

概要

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The atomic structures of new kinds of as-quenched La_<55>Al_<25>Ni_<20> and Zr_<60>Al_<15>Ni_<25> amorphous alloys exhibiting a wide supercooled liquid region and a high reduced glass transition temperature have been studied with the anomalous x-ray scattering (AXS) method in combination with the ordinary x-ray diffraction. The environmental structures around certain constituent elements in the alloys were determined with the AXS method. The atomic structures of these amorphous alloys annealed in the super-cooled liquid region were also investigated. The systematic structural studies revealed a structural feature common to these amorphous alloys. Namely, the environment around a certain element in the amorphous sample is very different from that in the crystallized sample. Such as, Ni atoms around La atoms in La_<55>Al_<25>Ni_<20> and Al atoms around Zr atoms in Zr_<60>Al_<15>Ni_<25>. In other words, quite a large change of the environments around a certain element is required for the crystallization, which controls the crystallization in these amorphous alloys. Consequently, This may provide a high thermal stability of these amorphous alloys.
東北大学の論文
1992-03-25