Rate-dependent shear banding and fracture behavior in a ductile bulk metallic glass

The strain rate dependence of plastic deformation of Ce60Al15Cu10Ni15 bulk metallic glass was studied by nanoindentation. Even though the ratio of room temperature to the glass transition temperature was very high (0.72) for this alloy, the plastic deformation was dominated by shear banding under nanoindentation. The alloy exhibited a critical loading rate dependent serrated flow feature. That is, with increasing loading rate, the alloy exhibited a transition from less prominent serrated flow to pronounced serrated flow during continuous loading but from serrated to smoother flow during stepped loading.

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Characterization of rate-dependent shear behavior of Zr-based bulk metallic glass using shear-punch testing

Journal of Materials Research ◽

10.1557/jmr.2006.0006 ◽

2006 ◽

Vol 21 (1) ◽

pp. 153-160 ◽

Cited By ~ 14

Author(s):

L.F. Liu ◽

L.H. Dai ◽

Y.L. Bai ◽

B.C. Wei ◽

J. Eckert

Keyword(s):

Metallic Glass ◽

Strain Rate ◽

Bulk Metallic Glass ◽

Shear Banding ◽

Shear Bands ◽

Transfer Model ◽

Free Volume Theory ◽

Rate Dependent ◽

Shear Punch ◽

Shear Punch Testing

In this study, the rate-dependent mechanical behavior of a Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass was studied using quasi-static and dynamic shear-punch testing at room temperature. The results demonstrate that the shear strength of this alloy is insensitive to the applied strain rate. However, the formation of shear bands and the serrated flow exhibits a significant strain rate effect. The shear banding-induced fracture patterns and the fracture-melting phenomenon were analyzed based on the free volume theory and the energy transfer model.

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Strain rate dependent shear banding behavior of a Zr-based bulk metallic glass composite

Materials Science and Engineering A ◽

10.1016/j.msea.2013.03.082 ◽

2013 ◽

Vol 576 ◽

pp. 134-139 ◽

Cited By ~ 28

Author(s):

J.H. Chen ◽

M.Q. Jiang ◽

Y. Chen ◽

L.H. Dai

Keyword(s):

Metallic Glass ◽

Strain Rate ◽

Bulk Metallic Glass ◽

Shear Banding ◽

Glass Composite ◽

Rate Dependent ◽

Bulk Metallic Glass Composite

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Fatigue and Fracture Behavior of a Ca-Based Bulk-Metallic Glass

Metallurgical and Materials Transactions A ◽

10.1007/s11661-009-0024-x ◽

2009 ◽

Vol 41 (7) ◽

pp. 1775-1779 ◽

Cited By ~ 5

Author(s):

J. Raphael ◽

G. Y. Wang ◽

P. K. Liaw ◽

O. N. Senkov ◽

D. B. Miracle

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Fracture Behavior ◽

Fatigue And Fracture

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Strain-rate dependence of hardening and softening in compression of a bulk-metallic glass

Journal of Materials Research ◽

10.1557/jmr.2007.0351 ◽

2007 ◽

Vol 22 (10) ◽

pp. 2655-2658 ◽

Cited By ~ 11

Author(s):

W.H. Jiang ◽

F.X. Liu ◽

F. Jiang ◽

K.Q. Qiu ◽

H. Choo ◽

...

Keyword(s):

Flow Stress ◽

Metallic Glass ◽

Strain Rate ◽

Bulk Metallic Glass ◽

Plastic Flow ◽

Shear Banding ◽

Constant Strain Rate ◽

Rate Dependence ◽

Strain Rate Dependence ◽

Plastic Flow Stress

We investigated the effect of strain rate on the plastic-flow stress of a Zr-based bulk-metallic glass in quasistatic compression. The results indicate that the plastic-flow stress is dependent on the strain rate: an increase in the strain rate leads to a decrease in the plastic-flow stress, and vice versa. However, simply loading, unloading, and reloading at a constant strain rate do not change the plastic-flow stress. This strain-rate dependence of the plastic-flow stress may be related to shear-banding operations.

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Atomic-scale viscoplasticity mechanisms revealed in high ductility metallic glass films

Scientific Reports ◽

10.1038/s41598-019-49910-7 ◽

2019 ◽

Vol 9 (1) ◽

Cited By ~ 3

Author(s):

Hosni Idrissi ◽

Matteo Ghidelli ◽

Armand Béché ◽

Stuart Turner ◽

Sébastien Gravier ◽

...

Keyword(s):

Metallic Glass ◽

Metallic Glasses ◽

Shear Banding ◽

Atomic Scale ◽

Microscopy Imaging ◽

Rate Dependent ◽

Imaging And Spectroscopy ◽

Shear Transformation Zones ◽

The Impact ◽

Glass Films

Abstract The fundamental plasticity mechanisms in thin freestanding Zr65Ni35 metallic glass films are investigated in order to unravel the origin of an outstanding strength/ductility balance. The deformation process is homogenous until fracture with no evidence of catastrophic shear banding. The creep/relaxation behaviour of the films was characterized by on-chip tensile testing, revealing an activation volume in the range 100–200 Å3. Advanced high-resolution transmission electron microscopy imaging and spectroscopy exhibit a very fine glassy nanostructure with well-defined dense Ni-rich clusters embedded in Zr-rich clusters of lower atomic density and a ~2–3 nm characteristic length scale. Nanobeam electron diffraction analysis reveals that the accumulation of plastic deformation at room-temperature correlates with monotonously increasing disruption of the local atomic order. These results provide experimental evidences of the dynamics of shear transformation zones activation in metallic glasses. The impact of the nanoscale structural heterogeneities on the mechanical properties including the rate dependent behaviour is discussed, shedding new light on the governing plasticity mechanisms in metallic glasses with initially heterogeneous atomic arrangement.

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