scholarly journals Rate-dependent shear-band initiation in a metallic glass

2015 ◽  
Vol 106 (17) ◽  
pp. 171907 ◽  
Author(s):  
D. Tönnies ◽  
K. Samwer ◽  
P. M. Derlet ◽  
C. A. Volkert ◽  
R. Maaß
Keyword(s):  
Shear Band ◽  
Metallic Glass ◽  
Rate Dependent

scholarly journals Tension-Tension Fatigue Behavior of High-Toughness Zr61Ti2Cu25Al12 Bulk Metallic Glass

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2815
Author(s):  
Yu Hang Yang ◽  
Jun Yi ◽  
Na Yang ◽  
Wen Liang ◽  
Hao Ran Huang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Shear Band ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Fatigue Resistance ◽  
Metallic Glasses ◽  
Stress Amplitude ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
High Toughness

Bulk metallic glasses have application potential in engineering structures due to their exceptional strength and fracture toughness. Their fatigue resistance is very important for the application as well. We report the tension-tension fatigue damage behavior of a Zr61Ti2Cu25Al12 bulk metallic glass, which has the highest fracture toughness among BMGs. The Zr61Ti2Cu25Al12 glass exhibits a tension-tension fatigue endurance limit of 195 MPa, which is higher than that of high-toughness steels. The fracture morphology of the specimens depends on the applied stress amplitude. We found flocks of shear bands, which were perpendicular to the loading direction, on the surface of the fatigue test specimens with stress amplitude higher than the fatigue limit of the glass. The fatigue cracking of the glass initiated from a shear band in a shear band flock. Our work demonstrated that the Zr61Ti2Cu25Al12 glass is a competitive structural material and shed light on improving the fatigue resistance of bulk metallic glasses.

Nanoscale periodic distribution of energy dissipation at the shear band plane in a Zr-based metallic glass

2021 ◽  
Vol 197 ◽  
pp. 113784
Author(s):  
D.P. Wang ◽  
H.T. Zhang ◽  
P.Y. Guo ◽  
B.A. Sun ◽  
Y.X. Wang
Keyword(s):  
Energy Dissipation ◽  
Shear Band ◽  
Metallic Glass ◽  
Periodic Distribution

scholarly journals Shear-band affected zone revealed by magnetic domains in a ferromagnetic metallic glass

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
L. Q. Shen ◽  
P. Luo ◽  
Y. C. Hu ◽  
H. Y. Bai ◽  
Y. H. Sun ◽  
...  
Keyword(s):  
Shear Band ◽  
Metallic Glass ◽  
Magnetic Domains

scholarly journals Shear-band thickness and shear-band cavities in a Zr-based metallic glass

2017 ◽  
Vol 140 ◽  
pp. 206-216 ◽  
Author(s):  
C. Liu ◽  
V. Roddatis ◽  
P. Kenesei ◽  
R. Maaß
Keyword(s):  
Shear Band ◽  
Metallic Glass

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

2019 ◽  
Vol 9 (1) ◽  
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.

scholarly journals A Ti/Ti-Based-Metallic-Glass Interpenetrating Phase Composite with Remarkable Mutual Reinforcement Effect

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
J. Mu ◽  
Z. W. Zhu ◽  
H. F. Zhang ◽  
H. W. Zhang ◽  
H. M. Fu ◽  
...  
Keyword(s):  
Shear Band ◽  
Metallic Glass ◽  
Phase Structure ◽  
High Strength ◽  
Reinforcement Effect ◽  
Crystalline Phases ◽  
Porous Ti ◽  
Strength And Ductility

A Ti/Ti-based-metallic-glass interpenetrating phase composite (IPC) was prepared by infiltrating theTi34.3Zr31.5Ni5.5Cu5Be23.7melt into the porous Ti skeleton. Porous Ti limits the shear band (SB) propagation and promotes the SB multiplication, leading to the improved ductility. Moreover, the interpenetrating phase structure shows a mutual reinforcement effect for both amorphous and crystalline phases, making IPC possess higher strength than that calculated by the models held for the conventional composites. This finding will suggest a new way for preparing composites with high strength and ductility.

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