Temperature dependence of serrated flows in compression in a bulk-metallic glass

2006 ◽  
Vol 89 (26) ◽  
pp. 261909 ◽  
Author(s):  
W. H. Jiang ◽  
F. Jiang ◽  
F. X. Liu ◽  
H. Choo ◽  
P. K. Liaw ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Temperature Dependence ◽  
Bulk Metallic Glass

Temperature-dependence of mode I fracture toughness of a bulk metallic glass

2018 ◽  
Vol 144 ◽  
pp. 325-336 ◽  
Author(s):  
Devaraj Raut ◽  
R.L. Narayan ◽  
Parag Tandaiya ◽  
Upadrasta Ramamurty
Keyword(s):  
Fracture Toughness ◽  
Metallic Glass ◽  
Temperature Dependence ◽  
Bulk Metallic Glass ◽  
Mode I ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness

scholarly journals Free-volume evolution and its temperature dependence during rolling of Cu60Zr20Ti20 bulk metallic glass

2005 ◽  
Vol 87 (10) ◽  
pp. 101901 ◽  
Author(s):  
Q. P. Cao ◽  
J. F. Li ◽  
Y. H. Zhou ◽  
A. Horsewell ◽  
J. Z. Jiang
Keyword(s):  
Metallic Glass ◽  
Temperature Dependence ◽  
Bulk Metallic Glass ◽  
Free Volume

Thermodynamic and kinetic fragilities of Mg-based bulk metallic glass-forming liquids

2008 ◽  
Vol 23 (10) ◽  
pp. 2816-2820 ◽  
Author(s):  
H. Ma ◽  
H-J. Fecht
Keyword(s):  
Relaxation Time ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Metallic Glass ◽  
Temperature Dependence ◽  
Bulk Metallic Glass ◽  
Excess Entropy ◽  
Gibbs Equation ◽  
Glass Forming

The thermodynamic and kinetic fragilities of two near-eutectic Mg-based bulk metallic glass (BMG)-forming liquids, Mg61Cu28Gd11 and Mg59.5Cu22.9Ag6.6Gd11, were investigated using high-precision differential scanning calorimeter (DSC). The thermodynamic fragility denoted as F3/4 was determined by evaluating the temperature dependence of the excess entropy Sex. The heating rate dependence of the relaxation time at the glass transition temperature was investigated to measure the kinetic fragility. A positive correlation between the thermodynamic and kinetic fragilities could be established in Mg-based BMG-forming liquids on the basis of Adam-Gibbs equation in contrast to a number of other BMGs.

Resonant vibration analysis for temperature dependence of elastic properties of bulk metallic glass

2007 ◽  
Vol 22 (2) ◽  
pp. 533-537 ◽  
Author(s):  
Sven Bossuyt ◽  
Sixto Giménez ◽  
Jan Schroers
Keyword(s):  
Metallic Glass ◽  
Temperature Dependence ◽  
Bulk Metallic Glass ◽  
Elastic Constants ◽  
Thermal History ◽  
Vibration Analysis ◽  
Supercooled Liquid ◽  
Resonant Vibration ◽  
Impulse Excitation ◽  
Calorimetry Data

The variation of a Zr57Nb5Cu15Ni13Al10 bulk metallic glass’s elastic constants with temperature and thermal history was investigated, using an impulse excitation technique for resonant vibration analysis. The Young’s modulus at 550 K is 78 GPa with a slope of −17 MPa/K in the glass as-produced and increases to 80 GPa with a slope of −26 MPa/K upon annealing. The modulus of the supercooled liquid at 700 K is 74 GPa with a slope of −90 MPa/K, whereas for the crystallized material E = 100 GPa with a slope of −15 MPa/K. These results are interpreted in terms of the vibrational and configurational contributions to the temperature dependence and compared with calorimetry data.

Temperature dependence of positron annihilation in a Zr–Ti–Ni–Cu–Be bulk metallic glass

2003 ◽  
Vol 18 (9) ◽  
pp. 2021-2024 ◽  
Author(s):  
Daewoong Suh ◽  
Reinhold H. Dauskardt ◽  
P. Asoka-Kumar ◽  
Philip A. Sterne ◽  
Richard H. Howell
Keyword(s):  
Metallic Glass ◽  
Temperature Dependence ◽  
Positron Annihilation ◽  
Bulk Metallic Glass ◽  
Strong Correlation ◽  
Glass Structure ◽  
Strong Temperature Dependence ◽  
Flow Processes ◽  
Different Types ◽  
And Diffusion

A strong temperature dependence of positron annihilation with low-momentum electrons is reported for a Zr-based bulk metallic glass in the temperature range 50–300 K. The observed behavior was rationalized in terms of shallow versus deep positron traps. An interpretation of the data was presented based on the idea that there were two different types of open-volume regions: Bernal interstitial sites and thermally unstable larger holes. Bernal interstitial sites, intrinsic to the glass structure, were found to be insensitive to annealing. Alternatively, the larger holes were removed by annealing. The strong correlation between these larger holes and diffusion and viscous flow processes suggests that they may act as diffusion and flow defects.

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