|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||Determination of Critical Cooling Rates in Metallic Glass Forming Alloy Libraries through Laser Spike Annealing
||Punnathat Bordeenithikasem, Jingbei Liu, Sebastian Kube, Yanglin Li, Tianxing Ma, Ellen Scanley, Douglas Hofmann, Christine Broadbridge, Joost Vlassak, Jonathan Singer, Jan Schroers
|On-Site Speaker (Planned)
The glass forming ability (GFA) of metallic glasses (MGs) is most directly quantified by the critical cooling rate (<I>R</I><SUB>C</SUB>). Despite its significance, <I>R</I><SUB>C</SUB> has been experimentally determined for only a small fraction of glass forming alloys due to experimental difficulties. We present a high-throughput combinatorial method to directly measure <I>R</I><SUB>C</SUB> for large compositional ranges. We synthesized compositionally-graded alloy libraries, which were then melted and cooled at various rates using scanning laser spike annealing. The libraries were then characterized with combinatorial X-ray diffraction, energy dispersive X-ray spectroscopy, and optical microscopy. In conjunction with computer simulations based on laser parameters, <I>R</I><SUB>C</SUB> values across a vast compositional space were mapped out. When combined with existing theories based on <I>a priori</I> known parameters and precise-but-slow bulk sample approaches, our method is powerful for materials discovery and, when correlating with chemistry and other properties, for a deeper understanding of MG formation.
||Planned: Supplemental Proceedings volume