Deformation and Failure of Zr57Ti5Cu20Ni8Al10 Bulk Metallic Glass Under Quasi-static and Dynamic Compression

2002 ◽  
Vol 17 (6) ◽  
pp. 1441-1445 ◽  
Author(s):  
T. C. Hufnagel ◽  
T. Jiao ◽  
Y. Li ◽  
L-Q. Xing ◽  
K. T. Ramesh
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
High Speed ◽  
Dynamic Compression ◽  
Shear Bands ◽  
Band Formation ◽  
Deformation And Failure ◽  
Dominant Deformation Mechanism ◽  
High Speed Cinematography ◽  
Mechanism Of Failure

We have examined the mechanical behavior of Zr57Ti5Cu20Ni8Al10 bulk metallic glass under uniaxial compression at strain rates from 10−4to 3 × 103 s−1. The failure stress decreases with increasing strain rate, and shear-band formation remains the dominant deformation mechanism. A consideration of basic properties of adiabatic shear bands makes it appear unlikely that shear bands formed under quasi-static loading are adiabatic; in the dynamic case, the time scales of deformation and thermal conduction are similar, indicating that a more sophisticated calculation is required. In the dynamic tests, however, high-speed cinematography reveals evidence that the mechanism of failure involves an adiabatic component.

High-Strain-Rate Dynamic Mechanical Properties of a W-Reinforced Zr-Based Bulk Metallic Glass Composite

2005 ◽  
Vol 903 ◽  
Author(s):  
Morgana Martin ◽  
Naresh N. Thadhani ◽  
Laszlo J. Kecskes ◽  
Robert J. Dowding
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
High Speed ◽  
Phase Distribution ◽  
Dynamic Compression ◽  
Plastic Property ◽  
Quantitative Information ◽  
Dynamic Mechanical Properties ◽  
Compression Tests ◽  
Deformation And Failure

AbstractThe structural/mechanical behavior of zirconium-based (Vitreloy106) bulk metallic glass reinforced with tungsten particles is evaluated using elastic and plastic property measurements via static and dynamic compression tests performed on rod shaped samples. Anvil-on-rod impact tests combined with high-speed digital photography and velocity interferometry are used to obtain qualitative and quantitative information about the transient deformation and failure response of the composites. The deformation and failure mechanisms of recovered impacted specimens are also characterized and correlated with their structure and tungsten phase distribution. The results of these experiments and initial attempts at validating constitutive equations based on homogeneous/inhomogeneous plastic/viscous flow in glassy and glassy-crystalline composites will be presented.

Plastic flow in dynamic compression of a Zr-based bulk metallic glass

2006 ◽  
Vol 21 (6) ◽  
pp. 1570-1575 ◽  
Author(s):  
W.H. Jiang ◽  
F.X. Liu ◽  
D.C. Qiao ◽  
H. Choo ◽  
P.K. Liaw
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Free Volume ◽  
Plastic Flow ◽  
Dynamic Compression ◽  
Maximum Shear Stress ◽  
Shear Banding ◽  
Shear Bands ◽  
Free Volume Model ◽  
Geometrically Constrained

Using geometrically constrained specimens, the plastic flow behaviors of the as-cast and the relaxed Zr52.5Cu17.9Ni14.6Al10.0Ti5.0 bulk metallic glass in the dynamic compression were investigated. Both alloys exhibit a significant plasticity in the dynamic compression. The plastic deformation in both alloys is still inhomogeneous, which is characterized by the serrated plastic flow and the formation of shear bands. Free volumes affect the shear banding and the plastic flow. The reduced free volume results in the deviation of the shear banding direction from the maximum shear stress. The relaxed alloy exhibits the obvious stress overshoot, which is consistent with the theoretical prediction using a free volume model.

In-Situ Observations of Shear Band Development during Deformation of a Bulk Metallic Glass

2000 ◽  
Vol 644 ◽  
Author(s):  
Paul A. El-Deiry ◽  
Richard P. Vinci ◽  
Nicholas Barbosa ◽  
T. C. Hufnagel
Keyword(s):  
Shear Band ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Shear Bands ◽  
Environmental Scanning ◽  
Compression Tests ◽  
Time Data ◽  
Band Formation ◽  
Serrated Flow ◽  
Stress Drops

AbstractWe have studied the development of shear band structure in a Zr57Ti5Cu20Ni8Al10 bulk metallic glass during deformation. In order to investigate the relationship between shear band development and serrated flow, we performed uniaxial compression tests in an environmental scanning electron microscope (ESEM). During the deformation, load-time data and surface images were simultaneously recorded. In the stress-time data, stress drops or “serrated flow” appear to correlate to new shear band formation. The majority of the shear bands we observed were at an angle of 45° with respect to the compression axis. In addition, we measured shear offset as a function of position along the shear band. We observed two different offset behaviors: Consistent offset along the length of a shear band, and offset that is localized into part of the band. The localized offset behavior could be evidence for dislocation-like displacement increments, or could be the result of a transition in the failure mode.

Fine Crystalline Phase Dispersion in Zr-Based Bulk Metallic Glass by Laser Irradiation

2007 ◽  
Vol 26-28 ◽  
pp. 747-750
Author(s):  
R. Ikutomo ◽  
Masato Tsujikawa ◽  
Makoto Hino ◽  
Hisamichi Kimura ◽  
Kunio Yubuta ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Shear Band ◽  
Metallic Glass ◽  
Laser Irradiation ◽  
Bulk Metallic Glass ◽  
Crystalline Phase ◽  
Shear Bands ◽  
High Strength ◽  
Band Formation ◽  
Phase Dispersion

Bulk metallic glass (BMG) exhibits remarkable properties such as high strength, good stiffness and good corrosion resistance. However, the wear resistance of amorphous metals is not excellent as expected their high strength. It is thought that large local shear bands easily change into cracks for debris formation. The effective obstruction of shear band formation might be applied to improve the wear resistance of BMG. In this study, we tried to suppress shear band deformation by fine crystalline phase dispersion formed by semi-conductor laser irradiation. The microstructures of irradiated Zr-based BMG specimens were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The fine dispersions of crystalline phases are observed in the amorphous matrix. The optimum condition for laser irradiation was discussed.

scholarly journals Influence of Defects to Zr65Cu18Ni7Al10 Bulk Metallic Glass Properties Under Dynamic Compression

2022 ◽  
Vol 8 ◽  
Author(s):  
C. Zhang ◽  
D. Zhou ◽  
B. Hou
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Dynamic Compression ◽  
Average Distance ◽  
Shear Bands ◽  
Sample Surface ◽  
Transformation Zone ◽  
Shear Transformation ◽  
Shear Transformation Zone ◽  
Ductile To Brittle Transition

The Zr65Cu18Ni7Al10 bulk metallic glass with smaller diameter exhibits higher fracture strength under dynamic compression, which is ascribed to concentration of flow defect. The density of shear bands in the sample surface will increase with decreasing of the diameter, whereas, average distance and width of tear ridges in the fracture surface will increase with larger diameter. In addition, the volume of shear transformation zone can be estimated, which presents a ductile-to-brittle transition with the change of diameter. The physical graph of shear transformation zone can be obtained from the experimental analysis.

scholarly journals High density of shear bands in the Vitreloy bulk metallic glass subjected to high-pressure torsion

2021 ◽  
Vol 1008 ◽  
pp. 012031
Author(s):  
Vasily Astanin ◽  
Dmitry Gunderov ◽  
Zhi Qiang Ren ◽  
Ruslan Valiev ◽  
Jing Tao Wang
Keyword(s):  
High Pressure ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
High Pressure Torsion ◽  
Shear Bands ◽  
High Density

scholarly journals Pressure-dependent flow behavior of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass

2003 ◽  
Vol 18 (9) ◽  
pp. 2039-2049 ◽  
Author(s):  
Jun Lu ◽  
Guruswami Ravichandran
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Inelastic Deformation ◽  
Shear Failure ◽  
Flow Behavior ◽  
Shear Bands ◽  
Ductile Deformation ◽  
Multiaxial Compression ◽  
Dependent Flow ◽  
Tresca Criterion

An experimental study of the inelastic deformation of bulk metallic glass Zr41.2Ti13.8Cu12.5Ni10Be22.5 under multiaxial compression using a confining sleeve technique is presented. In contrast to the catastrophic shear failure (brittle) in uniaxial compression, the metallic glass exhibited large inelastic deformation of more than 10% under confinement, demonstrating the nature of ductile deformation under constrained conditions in spite of the long-range disordered characteristic of the material. It was found that the metallic glass followed a pressure (p) dependent Tresca criterion τ = τ0 + βp, and the coefficient of the pressure dependence β was 0.17. Multiple parallel shear bands oriented at 45° to the loading direction were observed on the surfaces of the deformed specimens and were responsible for the overall inelastic deformation.

Orientation effect of pre-introduced shear bands in a bulk-metallic glass on its “work-ductilising”

2008 ◽  
Vol 496 (1-2) ◽  
pp. 285-290 ◽  
Author(s):  
L. He ◽  
M.B. Zhong ◽  
Z.H. Han ◽  
Q. Zhao ◽  
F. Jiang ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Shear Bands ◽  
Orientation Effect
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