Metal glass alloy

Patent Granted PROBLEM TO BE SOLVED: To provide a Co base metal glass alloy having a satisfactory workability and a high strength, and also having high glass formability. SOLUTION: The Co base metal glass alloy has a composition expressed by (Co<SB>1-x</SB>Fe<SB>x</SB>)<SB>100-a-b-c-d</SB>M<SB>a</SB>C<SB>b</SB>B<SB>c</SB>L<SB>d</SB>(wherein, M is one or two kinds selected from Mo and Cr; L is one or more kinds of elements selected from Y, Dy, Ho, Er, Tm and Yb; further, 0<=x<=0.7, in which a, b, c, and d are atomic%, respectively; and, 22<=a<=35, 6<=b<=20, 1<=c<=11, 10<=b+c<=26, and 0.5<=d<=4 are satisfied).