Structural Change of Amorphous Mg_<70>Zn_<30> Alloy under Isothermal Annealing

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Atomic structure of amorphous Mg-Zn alloys of near eutectic compositionand the structural change toward the crystalline Mg 5. Zn.g under isothermQlannealing at 350 K are investigated by X-ray diffraction and EXAFS. The struc-Cure factors and the reduced radial distribution functions obtained from the X-raydiffraction and the near neighbor partial radial distributions of Zn-Zn and Zn-Mgpairs from the EXAFS show that i) the amorphous state is random aggregateof chemical and structural units which have more or less regular polyhedralconfigurations and topologically similar to those in the crystalline Mg5jZnzg,11) in the first stage of annealing these units change their shape and size to enhancecoherency in spatial relation with neighboring units, iii) in the second stage theunits are further deformed to establish the long range order of the crystallineM8srZ[1zo-
社団法人日本物理学会の論文
1985-05-15