Bulk metallic glass casting investigated using high-speed infrared monitoring and complementary fast scanning calorimetry

This study describes a method which has been developed to monitor flow and cooling during casting using a high-speed infrared camera. The spatial and temporal resolutions were 60 j.im and 1 ms, respectively. Calibration was performed to obtain the local, quantitative temperature history of a wedge-shaped specimen after post processing. Depending on microstructure (amorphous vs. crystalline) a temperature measurement accuracy of +/- 3 K or +/- 5 K was achieved. The temperature data recorded for a low-melting Au-based alloy during casting were compared thoroughly with its crystallization kinetics. The high-speed infrared measurements correlate well with fast differential scanning calorimetry (FDSC) results. This emphasizes the great potential of both techniques for studying fundamental processes which occur during casting. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.