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Flash Joule heating for ductilization of metallic glasses
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2015 (English)In: Nature Communications, ISSN 2041-1723, Vol. 6, 7932Article in journal (Refereed) Published
Abstract [en]

Metallic glasses (MGs) inherit their amorphous structure from the liquid state, which predetermines their ability to withstand high loads approaching the theoretical limit. However, the absence of slip systems makes them very sensitive to the type of loading and extremely brittle in tension. The latter can be improved by precipitation of ductile crystals, which suppress a catastrophic propagation of shear bands in a glassy matrix. Here we report a novel approach to obtain MG-matrix composites with tensile ductility by flash Joule heating applied to Cu(47.5)Zr(47.)5Al(5) (at.%) metallic glass. This homogeneous, volumetric and controllable rapid heat treatment allows achieving uniformly distributed metastable B2 CuZr crystals in the glassy matrix. It results in a significant tensile strain of 6.8 +/- 0.5%. Moreover, optimized adjustment of the heat-treatment conditions enables tuning of microstructure to achieve desired mechanical properties.

Place, publisher, year, edition, pages
2015. Vol. 6, 7932
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Chemical Sciences
URN: urn:nbn:se:uu:diva-261319DOI: 10.1038/ncomms8932ISI: 000358865000001PubMedID: 26219864OAI: diva2:850885
Available from: 2015-09-02 Created: 2015-09-01 Last updated: 2015-09-02Bibliographically approved

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Edström, Kristina
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