Properties of as-cast and structurally relaxed Zr-based bulk metallic glasses |
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Authors: | Cang Fan Laszlo J Kecskes Hahn Choo Peter K Liaw |
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Institution: | a Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, United States b US Army Research Laboratory, Aberdeen Proving Ground, MD 21005, United States c Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States |
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Abstract: | We have studied the influence of the arc melting procedure of Nb-containing Zr-based bulk metallic glasses (BMGs) on their thermal and mechanical properties. We found that the strength and plastic strain to failure, determined at room temperature, increases by the addition of a few percentage of Nb into the Zr-based BMGs. High-resolution transmission-electron microscopy results show that the addition of 2 at.% Nb introduces the formation of as-cast nanocrystals. At the same time, thermal analyses indicate an increase in glass forming ability with the small addition of Nb. Contrary to the reported results in other amorphous alloys, we found that the plastic strain increases further after heat-induced structural relaxation in the Zr-based BMGs. |
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Keywords: | Amorphous metals Metallic glasses Alloys Mechanical properties Strength Structural relaxation |
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