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Accessing thermoplastic processing windows in metallic glasses using rapid capacitive discharge

Kaltenboeck, Georg and Harrison, Thomas and Sun, Kerry and Tran, Thomas and Chang, Gregory and Schramm, Joseph P. and Demetriou, Marios D. and Johnson, William L. (2014) Accessing thermoplastic processing windows in metallic glasses using rapid capacitive discharge. Scientific Reports, 4 . Art. No. 6441. ISSN 2045-2322. PMCID PMC4180804. doi:10.1038/srep06441.

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The ability of the rapid-capacitive discharge approach to access optimal viscosity ranges in metallic glasses for thermoplastic processing is explored. Using high-speed thermal imaging, the heating uniformity and stability against crystallization of Zr_(35)Ti_(30)Cu_7.5Be_(27.5) metallic glass heated deeply into the supercooled region is investigated. The method enables homogeneous volumetric heating of bulk samples throughout the entire supercooled liquid region at high rates (~10^5 K/s) sufficient to bypass crystallization throughout. The crystallization onsets at temperatures in the vicinity of the “crystallization nose” were identified and a Time-Temperature-Transformation diagram is constructed, revealing a “critical heating rate” for the metallic glass of ~1000 K/s. Thermoplastic process windows in the optimal viscosity range of 10^0–10^4 Pa·s are identified, being confined between the glass relaxation and the eutectic crystallization transition. Within this process window, near-net forging of a fine precision metallic glass part is demonstrated.

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Additional Information:© 2014 Macmillan Publishers Limited. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit Received: 21 May 2014; Accepted: 14 August 2014; Published: 1 October 2014. Authors acknowledge partial support by the II–VI Foundation and by Glassimetal Technology.
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Glassimetal TechnologyUNSPECIFIED
Subject Keywords:Metals and alloys; Glasses
PubMed Central ID:PMC4180804
Record Number:CaltechAUTHORS:20141030-091834524
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Official Citation:Kaltenboeck, G., Harris, T., Sun, K., Tran, T., Chang, G., Schramm, J. P., . . . Johnson, W. L. (2014). Accessing thermoplastic processing windows in metallic glasses using rapid capacitive discharge. [Article]. Sci. Rep., 4. doi: 10.1038/srep06441
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51049
Deposited By: Jason Perez
Deposited On:30 Oct 2014 17:28
Last Modified:10 Nov 2021 19:05

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