Flow characteristics and formability of a bulk metallic glass with a wide undercooled liquid region

✍ Scribed by Kwang Seok Lee; Hyun-Joon Jun; Young Won Chang

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 412 KB
• Volume: 449-451
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.02.308

✦ Synopsis

Deformation behavior of Zr 44 Ti 11 Cu 9.8 Ni 10.2 Be 25 (number indicate at.%) bulk metallic glass having a wide undercooled liquid temperature interval has been investigated by performing a series of compression tests after rapid heating. The regions of brittle fracture, a non-Newtonian flow, and a Newtonian viscous flow were identified depending on the test conditions in terms of initial strain rate and temperature. A deformation map was constructed by applying both transition state and Newtonian viscous equations to the flow stress data to provide the boundaries between these three different deformation modes. The basic processing map based on a dynamic materials model has also been constructed to obtain an optimal forming condition.