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K/s, very thin ribbons or wires could be obtained. Recently, several families of
multicomponent metallic alloy, which shows excellent glass forming ability, have
been developed. For the alloys, conventional casting, whose cooling rate is
lower than 10 K/s, can be applied to produce amorphous alloys. Using the alloy,
bulk structural components can be produced, where the alloy is called bulk
metallic glass (BMG). The lack of any long-range order and the subsequent
absence of microstructures have led to very high strength and very high corrosion
resistance [1]. BMG is in a supercooled liquid state at a temperature between
the glass-transition temperature, Tg, and the crystallization temperature, Tx, and
machine components can be made by precision casting of BMG because of its
low shrinkage from the supercooled liquid state to the solid state. Owing to
these excellent properties, BMG has received considerable attention as a
structural material, especially for small or micromachine components [2]. To
ensure the integrity of structures made of BMG, the mechanisms and mechanics
of fatigue fracture should be clarified [3-8].