Nickel-based bulk metallic glass alloys containing high amount of refractory metal and boron
First nickel-based bulk metallic glass alloys having a high glass forming ability, wherein in the first nickel-based bulk metallic glass alloys both a phase having a high fracture toughness, a nickel solid solution and borides having a high hardness is formed by a heat treatment at temperatures above crystallization temperatures.
1. A nickel-based bulk metallic glass alloy containing a refractory metal and boron, comprising
Ni a Co b W c B d M1 e M2 f M3 g M4 h formula, wherein M1 is at least one element selected from the group consisting of Fe, Cu, Cr, Mn, and Al; M2 is at least one element selected from the group consisting of Ti, Zr, Er, Sm, Nd, Y, La, and Hf; M3 is at least one element selected from the group consisting of Ta, Nb, Mo, and V; M4 is at least one element selected from the group consisting of C, Si, P, and Be; and values according to an atomic % basis are as follows:
an amount of a component a is between 25 and 60,
an amount of a component b is between 8 and 35,
an amount of a component c is between 8 and 30,
an amount of a component d is between 12.1 and 30,
an amount of a component e is between 0 and 15,
an amount of a component f is between 0 and 10,
an amount of a component g is between 0 and 15,
an amount of a component h is between 0 and 15.
2. The nickel-based bulk metallic glass alloy according to claim 1 , wherein
a total of a+b+e+f component amount according to the atomic % basis is between 33 and 75,
a total of c+g component amount according to the atomic % basis is between 8 and 40,
a total of d+h component amount according to the atomic % basis is between 12.1 and 30.