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Published November 12, 2013 | Published
Journal Article Open

Enhanced fatigue endurance of metallic glasses through a staircase-like fracture mechanism


We believe this article is of broad interest to the materials science and engineering community. Bulk-metallic glasses (BMGs) are currently considered candidate materials for numerous structural applications. A major limitation in their use as engineering material is the often poor and inconsistent fatigue behavior. Although recently developed BMG composites provide one solution to this problem, fatigue remains a main issue for monolithic metallic glasses. The authors report unexpectedly high fatigue resistance in a monolithic Pd-based glass arising from extensive shear-band plasticity, resulting in a very rough and periodic "staircase" crack trajectory. The research both reveals a unique mechanism in fatigue of a monolithic metallic glass and demonstrates that this mechanism mitigates previous limitations on its use as an engineering material.

Additional Information

© 2013 National Academy of Sciences. Contributed by William L. Johnson, September 25, 2013 (sent for review December 28, 2012). This work was funded by the Director, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, of the US Department of Energy under Contract DE-AC02-05CH11231 (which provided financial support for B.G. and R.O.R.). M.D.D., M.F., and W.L.J. acknowledge funding support from the Office of Naval Research under Contract N00014-07-1-1115.

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Published - PNAS-2013-Gludovatz-18419-24.pdf


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