Bulk Amorphous Metals for Advanced Applications
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چکیده
Usually metals and alloys are in a crystalline state. However, metallic glasses ( amorphous metals ) can be obtained from certain alloys with the right composition, when they are quenched from the liquid state at a high enough cooling rate. Since their discovery in 1960, amorphous metals or metallic glasses have been developed from binary systems of micron size (ribbons and powders) to multi-component systems of up to several centimeters even under conventional casting conditions. This arises from the discovery and use of unique alloy compositions. The ability to obtain amorphous metals in bulk opened up their potential for structural applications. Their elastic strain limit of 2% is much higher than that of crystalline metallic alloys ( less than 1%) and they have extremely high tensile yield strength of 2 GPa which is twice that of stainless steel and titanium.
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