Letter abstract
Nature Materials 5, 15 - 18 (2005)
Published online: 18 December 2005 | doi:10.1038/nmat1536
Subject Categories: Metals and alloys | Glasses | Mechanical properties
Temperature rise at shear bands in metallic glasses
J. J. Lewandowski & A. L. Greer
At ambient temperature the plastic flow shown by metallic glasses is localized into shear bands1, 2. This localization and the liquid-like features seen on fracture surfaces are consistent with shear softening in the bands. The extent to which this softening is a result of local heating has remained controversial, with estimates of the local temperature rise ranging from less than 0.1 kelvin to a few thousand kelvin3, 4, 5, 6, 7, 8, 9, 10, 11. Here we present a new experimental method based on a fusible coating, which shows that the temperature rise, over a few nanoseconds, can be as high as a few thousand kelvin; nevertheless, the temperature rise does not seem to control the shear-band thickness. It is important to understand the mechanisms of shear banding and associated softening because these are the principal factors limiting structural applications of bulk metallic glasses, which have some attractive mechanical properties such as high yield strength12, 13.
- Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK
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J. J. Lewandowski, permanent address: Department of Materials Science and Engineering, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA
Correspondence to: J. J. Lewandowski e-mail: jjl3@cwru.edu
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