Brittle-ductile transitions in a metallic glass

Physical Review. E
J S Langer

Abstract

Recent computational and laboratory experiments have shown that brittle-ductile transitions in the notch toughnesses of metallic glasses such as Vitreloy 1 are strongly sensitive to the initial effective disorder (or "fictive") temperature. Glasses with lower effective temperatures are weak and brittle; those with higher effective temperatures are strong and ductile. The analysis of this phenomenon presented here examines the onset of fracture at the tip of a notch as predicted by the shear-transformation-zone theory of spatially varying plastic deformation. The central ingredient of this analysis is an approximation for the dynamics of the plastic zone formed by stress concentration at the notch tip. This zone first shields the tip but then, with increasing stress, expands suddenly, producing a discontinuous transition between brittle and ductile failure in satisfactory agreement with the numerical and experimental observations.

References

Mar 1, 1996·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·E S ChingH Nakanishi
Oct 13, 2007·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Eran BouchbinderItamar Procaccia
Mar 21, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J S Langer
Dec 12, 2012·Physical Review Letters·Chris H Rycroft, Eran Bouchbinder
Feb 28, 2013·Nature Communications·Golden KumarJan Schroers
Aug 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·J S Langer
Jan 20, 2018·Physical Review. E·J S Langer
Aug 18, 2018·Nature Communications·Jittisa KetkaewJan Schroers
Oct 13, 2018·Physical Review Letters·Yuri LubomirskyEran Bouchbinder

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Citations

Jul 18, 2021·Physical Review. E·J S Langer

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