|About this Abstract
||2011 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses VIII
||Novel Net-Shape Processing of Metallic Glass by Rapid Joule Heating
||Marios D. Demetriou, Georg Kaltenboeck, Joseph P. Schramm, William L. Johnson
|On-Site Speaker (Planned)
||Marios D. Demetriou
In an effort to process metallic glass into net shape, thermoplastic methods that take advantage of the vitreous state of the undercooled liquid have been explored. These methods are limited by the relatively low stability of the liquid against crystallization, which prohibits processing within the optimum viscosity range of 10-1000 Pa-s utilized in conventional thermoplastic processes. Consequently, thermoplastic forming of metallic glass typically requires very high pressures, often approaching the flow stresses of tools. Recently, a joule heating method for processing metallic glass has been developed. The method takes advantage of the unique electrical properties of the metallic glass to heat rapidly and uniformly across the entire undercooled liquid region bypassing crystallization. Processing in the viscosity range of 10-1000 Pa-s is achievable by this method, which promotes low-cost fabrication of high-precision net-shape metallic glass parts. The rapid joule heating and forming method constitutes a powerful platform for processing metallic glass.