27.4. Microfabrication Ability of BMGs

27.4.1. Superplasticity of Metallic Glasses in Supercooled Liquid

Superplasticity is the unusual property of a material which allows thousands of percent elongation at elevated temperatures. Under normal conditions, conventional alloys do not stretch uniformly, but form a neck-down region and then fracture after elongations of only 100% or less. It is well known that the fine fibers of oxide and fluoride glasses are produced by utilizing the viscous flow deformation of supercooled liquid which can be obtained in a wide temperature range before crystallization and the elongation reaches the order of 105% to 106%. If the similar wide supercooled liquid region is obtained for metallic glass alloys, the glassy ...

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