To obtain a bulky alloy excellent in strength property and workability and capable of using as a structural material by having a composition satisfying a specific relation and forming from an amorphous phase equal to or above the specific value in volume ratio.
The bulky alloy has the composition expressed by a general formula, Zr100-X-Y-a-bTiXAlYCuaNib and is composed of ≥50 vol.% amorphous phase. In the formula, each of a, b, X and Y is a molar ratio and satisfies X<10, Y>5, Y<-(1/2)X+35/2, 15≤a≤25 and 5≤b≤15. To obtain the Zr based amorphous alloy 1, a lower die 5 is moved in the horizontal direction to be stopped below an arc electrode 8 and plasma is generated between the arc electrode and a metallic materia 26 to completely melt the metallic material 26 to form a molten metal. After that, the lower die 5 is rapidly moved below an upper die 4, the upper die is descended, the molten metal 28 is pressed by the dies 5 and 4 to deform and at the same time as or after the deformation, is cooled at equal to above the critical cooling rate.
CHIYOU TOU
ONUKI MASAHIDE
YAMAGUCHI TETSUO
INOE AKIHISA
YKK CORP
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