About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Critical Crystallization Properties of an Industrial-Grade Zr-based Metallic Glass-Forming Alloy Used in Additive Manufacturing Measured with Fast Scanning Calorimetry |
Author(s) |
Danielle Kimmel, Juergen Schawe |
On-Site Speaker (Planned) |
Juergen Schawe |
Abstract Scope |
A major challenge during processing of metallic glasses is to avoid crystallization. Crystallization kinetics can be characterized using time-temperature-transformation (TTT) diagrams. With conventional techniques, such a diagram can be only measured for very slowly crystallizing alloys like Pb-based glasses. The cost of such materials limits the number of applications. The Zr-based glass-forming alloy Zr59Cu28.8Al10.4Nb1.5 is available as an industrial-grade alloy powder AMZ4, which gained great attention in laser-based additive manufacturing methods.
Using Fast Differential Scanning Calorimetry (FDSC) the critical cooling and heating rates to avoid crystallization are determined to 2500 K/s and 45,000 K/s, respectively. The TTT diagram are determined upon cooling from the melt and upon heating from the gassy state. Additionally the continuous cooling transformation (CCT) diagram and the continuous heating transformation (CHT) diagram is determined.
The time to crystallization of AMZ4 is very short. This may be related to the relatively high oxygen content in the powder. |