Accessing thermoplastic processing windows in metallic glasses using rapid capacitive discharge View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2014-10-01

AUTHORS

Georg Kaltenboeck, Thomas Harris, Kerry Sun, Thomas Tran, Gregory Chang, Joseph P. Schramm, Marios D. Demetriou, William L. Johnson

ABSTRACT

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 Zr35Ti30Cu7.5Be27.5 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 (~105 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 100–104 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. More... »

PAGES

6441

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/srep06441

DOI

http://dx.doi.org/10.1038/srep06441

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1034596228

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/25269892


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