Regensburg 2019 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 36: Liquid and Amorphous Metals
MM 36.6: Talk
Thursday, April 4, 2019, 11:45–12:00, H46
Origin of Large Plasticity in Fe50Ni30P13C7 Bulk Metallic Glass — •Baran Sarac1, Yurii P. Ivanov2, Mihai Stoica3, and Jürgen Eckert1,4 — 1Erich Schmid Institute of Materials Science, Leoben, Austria — 2University of Cambridge, Cambridge UK — 3ETH Zurich, Zurich, Switzerland — 4Montanuniversität Leoben, Leoben, Austria
Despite Fe-based bulk metallic glasses (BMGs) garner great interest owing to their combined high temperature thermal stability, soft magnetic properties along with high strength, the biggest barrier against a more widespread use is their negligible plasticity. A newly developed Fe50Ni30P13C7 BMG overcome this limitation via extensive compressive plasticity [1]. Using a combination of an aberration-corrected high-resolution transmission electron microscopy (HRTEM) and nanoindentation techniques, we identified a multi-stage deformation mechanism involving 1-1.5 nm sized homogeneously dispersed crystals and micro-scale heterogeneities [2]. Besides, we conducted a systematic set of simulations of the HRTEM images at varying sample thicknesses, and adopted a cooperative shearing model for the estimation of the shear transformation zone size of Fe50Ni30P13C7 BMG. The findings indicate that the controlled nanocrystal-induced plasticity with crystal sizes of several nanometers contributes to the remarkable shear observed under quasi-static compression and enhance the plasticity of the BMG through the initiation and impediment of STZs. [1] W.M. Yang et al., Sci Rep, 4, 6233 (2014) [2] B. Sarac, et al., Nat Commun, 9, 1333 (2018)