Metallic glass University of Ljubljana（金属玻璃卢布尔雅那大学）.pdf

UNIVERSITY OF LJUBLJANA FACULTY OF MATHEMATICS AND PHYSICS Seminar Metallic glass Absract Researches are close to perfecting a new material called metallic glass that has puzzled scientists since the 1960s. The new material is said to be three times stronger than the best industrial steel and ten times springier. Metallic glass is created by c ling molten alloys extremely fast so that crystalization, which creates points of weakness, is stopped instantly, essentially giving the solid material the atomic properties of a liquid. Increased plasticity in amorphous- crystalline composites now promises new structural applications. Author: Katrca Mivšek Mentor: prof. dr. Janez Dolinšek Ljubljana, november 2006 Contents 1. Conventional metallic glass3 1.1. Extraordinary properties of metallic glass3 1.2. Critical casting thickness 5 2. Bulk metallic glass (BMG)5 1.2. Development of bulk metallic glass 5 2.2. Thermodynamics, kinetics, and crystallization of BMGs 7 3. A variety of uses 14 4. Conclusion18 Literature 19 2 1. Conventional metallic glass Glass is a uniform amorphous solid material, usually produced when the viscous molten material c ls very rapidly to below its glass transition temperature, without sufficient time for a regular crystal lattice to form. The term glass transitio