Effect of Compositions on the Crystallization of (Fe, Ni, Co)-Si-B Amorphous Alloys

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This paper presents the effects of metalloid and metal compositions on the crystallization of X-Si-B ternary and (X, Y)_<78>Si_<10>B_<12> (X, Y : Fe, Ni, Co) quaternary amorphous alloys. The crystallization behavior has been examined by means of transmission electron microscopy, X-ray analysis and differential thermal analysis. The crystallization process of X-Si-B alloys changes in the vicinity of 27〜29 at% metalloid contents. Below and above this metalloid content, the amorphous phases crystallize following the process of Am→Am+MS-I→MS-I+MS-II→Stable. In the lower metalloid contents the MS-I phase is a crystal with the same structure as each master metal, while in the higher contents it is a compound containing a large amount of metalloid elements. In the intermediate metalloid contents (27〜29 at%), these MS-I phases do not precipitate, but the MS-II phase appears directly from the amorphous matrix and transforms finally to stable phases. The crystallization process of (X. Y)_<78>Si_<10>B_<12> amorphous alloys proceeds through two metastable phases (MS-I and MS-II) and finally to stable phases. The crystalline structure of MS-I phase agrees well with that of equilibrium phase at room temperature for the X-Y binary alloys.
東北大学の論文