Bulk metallic glass casting investigated using high-speed infrared monitoring and complementary fast scanning calorimetry. (1st June 2018)

• Record Type: Journal Article
• Authors: Haag, Fabian; Geisel, Steffen; Kurtuldu, Güven; Löffler, Jörg F.
• Is Part Of: Acta materialia. Volume 151(2018)
• Page Start: 416
• Page End: 423
• Publication Date: 2018-06-01
• Subjects: Bulk metallic glasses -- Critical cooling rate -- High-speed infrared imaging -- Fast differential scanning calorimetry -- Crystallization kinetics; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2018.02.029
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: 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 μm 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. Graphical abstract: Image 1