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In one aspect, an amorphous alloy comprises Cu, Zr, Be and M. M is at least one element selected from a group consisting of Al, Sn, Si, and transition metals, excluding Cu and Zr. In another aspect, an amorphous alloy comprises Cu, Zr, RE and M. RE is at least one element selected from the Rare-Earth Group, M is at least one element selected from a group consisting of Al, Sn, Si, and transition metals, excluding Cu, Zr and RE. In yet another aspect, a method for preparing an amorphous alloy comprises melting a raw material comprising Cu, Zr, Be, and M to form an alloy. M is at least one element selected from a group consisting of Al, Sn, Si, and transition metals, excluding Cu and Zr.