Universal Scaling in the Temperature-Dependent Viscous Dynamics of Metallic Glasses

2021 ◽  
Author(s):  
Meng Zhang ◽  
Yan Chen ◽  
Lan-hong Dai
Keyword(s):  
Metallic Glasses ◽  
Temperature Dependent ◽  
Universal Scaling

scholarly journals Temperature-dependent yield asymmetry between tension and compression in metallic glasses

2012 ◽  
Vol 61 (3) ◽  
pp. 036201
Author(s):  
Chen Yan ◽  
Jiang Min-Qiang ◽  
Dai Lan-Hong
Keyword(s):  
Metallic Glasses ◽  
Temperature Dependent ◽  
Tension And Compression

High Temperature Nanoindentation for the Study of Flow Defects

2004 ◽  
Vol 841 ◽  
Author(s):  
C. A. Schuh ◽  
J. K. Mason ◽  
A. C. Lund ◽  
A. M. Hodge
Keyword(s):  
Metallic Glasses ◽  
Recent Progress ◽  
Activation Volume ◽  
Shear Bands ◽  
Discrete Events ◽  
Temperature Dependent ◽  
Crystalline Materials ◽  
Plasticity Problem ◽  
Incipient Plasticity ◽  
Nucleation Of Dislocations

ABSTRACTOur recent progress in elevated temperature nanoindentation is reviewed, with an emphasis on the study of discrete events (i.e., pop-in phenomena) observed during nanoindentation. For crystalline materials the incipient plasticity problem is associated with the nucleation of dislocations, an effect which we show to be significantly temperature dependent. For metallic glasses it is the operation of individual shear bands beneath the indenter that gives rise to pop-in events; here we also show this to be a temperature dependent phenomenon. Approaches to extract the activation volume and energy of defects involved in plastic flow beneath the indenter are also briefly described.

Theoretical prediction of temperature dependent shear modulus of bulk metallic glasses

2017 ◽  
Vol 91 ◽  
pp. 86-89 ◽  
Author(s):  
Xianhe Zhang ◽  
Weiguo Li ◽  
Ying Li ◽  
Jianzuo Ma ◽  
Yong Deng ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Theoretical Prediction ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Temperature Dependent

scholarly journals Strength criterion and temperature dependent strength model of metallic glasses

2019 ◽  
Vol 163 ◽  
pp. 242-251 ◽  
Author(s):  
Xianhe Zhang ◽  
Weiguo Li ◽  
Yong Deng ◽  
Jiaxing Shao ◽  
Xuyao Zhang ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Strength Criterion ◽  
Strength Model ◽  
Temperature Dependent

Fracture Toughness of Amorphous Metals and Composites

2002 ◽  
Vol 754 ◽  
Author(s):  
J.J. Lewandowski ◽  
A.K. Thurston ◽  
P. Lowhaphandu
Keyword(s):  
Fracture Toughness ◽  
Metallic Glasses ◽  
Shear Banding ◽  
Notch Toughness ◽  
Body Centered Cubic ◽  
Temperature Dependent ◽  
Notch Radius ◽  
Glass Composites ◽  
Planar Crack ◽  
Crack Bifurcation

ABSTRACTThe effects of changes in notch radius on the toughness of two different Zr-based bulk metallic glasses have been determined. It is shown that increases in notch radius produce large increases to the toughness, accompanied by extensive shear banding and crack bifurcation. The fracture toughness of twenty (20) fatigue precracked specimens exhibiting planar crack growth were in the range 20.3 ± 6.7 MPa√m for the two Zr-based glasses. Increasing the notch radius to 110 μm produced notch toughness in the range 95.3 ± 8.3 MPa√m for nine (9) tests on Vitreloy I, well in excess of that typically observed in most structural materials. Toughness tests conducted on two fatigue precracked specimens of Vitreloy I at 77 K produced values for fracture toughness that were in the range 17.9 ± 2.7 MPa√m, similar to that obtained at 298 K. The fatigue precracked fracture toughness of metallic glass composites containing large crystalline regions of a body centered cubic Zr-Ti-Nb alloy were in the range 29–42 MPa√m, but the values were temperature dependent over the range 148 K to 500 K. Fracture surfaces were analyzed via Scanning Electron Microscopy (SEM).

scholarly journals Temperature-Dependent Mechanical Property of Zr-Based Metallic Glasses

2007 ◽  
Vol 48 (7) ◽  
pp. 1752-1754 ◽  
Author(s):  
Hongqi Li ◽  
Cang Fan ◽  
Hahn Choo ◽  
Peter K. Liaw
Keyword(s):  
Mechanical Property ◽  
Metallic Glasses ◽  
Temperature Dependent

Structural, Transport, and Magnetic Characterization of NiZr Metallic Glasses with varied Ni/Zr composition

2011 ◽  
Vol 1300 ◽  
Author(s):  
A. F. Isakovic ◽  
S. D. Sulejmanovic ◽  
T. P. Mihac ◽  
K. Evans-Lutterodt
Keyword(s):  
Magnetic Field ◽  
Metallic Glasses ◽  
Temperature Dependent ◽  
Magnetic Characterization ◽  
X Ray ◽  
Partial Crystallization ◽  
Dependent Transport ◽  
Control Samples ◽  
Diffuse Spectrum

ABSTRACTThree families of NixZry (x = 28, 36, 38, x + y = 100%) metallic glasses were prepared and examined using X-ray, temperature dependent transport and magnetic field. X-ray characterization shows characteristic diffuse spectrum, except for narrow regions of control samples, where partial crystallization was induced in finite small volumes. Magnetic properties confirm spin-fluctuating paramagnetic-like behavior, which we asses from preliminary Hall coefficient measurements, which is quantitatively different in three sample families. Temperature dependent AC and DC transport measurements were conducted in a broad temperature range from 70 K to 700 K, finding both quantitative and semi-qualitative differences between samples with different Ni/Zr ratio.

scholarly journals Short Range Chemical Ordering in Bulk Metallic Glasses

2000 ◽  
Vol 644 ◽  
Author(s):  
P. A. Sterne ◽  
P. Asoka-Kumar ◽  
J. H. Hartley ◽  
R. H. Howell ◽  
T.G. Nieh ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Critical Density ◽  
Positron Annihilation Spectroscopy ◽  
Atomic Scale ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Chemical Ordering ◽  
Open Volume

AbstractWe provide direct experimental evidence for a non-random distribution of atomic constituents in Zr-based multi-component bulk metallic glasses using positron annihilation spectroscopy. The Ti content around the open-volume regions is significantly enhanced at the expense of Cu and Ni, indicating that Cu and Ni occupy most of the volume bounded by their neighboring atoms while Ti and Zr are less closely packed and more likely to be associated with open-volume regions. Temperature-dependent measurements indicate the presence of at least two different characteristic sizes for the open volume regions. Measurements on hydrogen- charged samples show that the larger open-volume regions can be filled by hydrogen up to a critical density. Beyond this critical density, local atomic-scale open-volume damage is created in the sample to accommodate additional hydrogen. The onset of this local damage in positron annihilation data coincides with the onset of volume expansion in X-ray diffraction data.

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

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