Glassy type metallic alloys exhibit unique characteristics which cannot be obtained for conventional amorphous alloys. For the last more than two decades, a number of bulk glassy alloy (BGA) systems have been developed and centimeter-class BGAs have been prepared in almost all alloy systems. Among them, Fe- and Co-based BGAs have attracted much attention and have been commercialized in various fields. This paper reviews recent developments and applications of Fe- and Co-based BGAs and their future prospects are also described.
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