Shear modulus and compliance in the range of the dynamic glass transition for metallic glasses

1998 ◽  
Vol 5 (1) ◽  
pp. 1-5 ◽  
Author(s):  
K. Schröter ◽  
G. Wilde ◽  
R. Willnecker ◽  
M. Weiss ◽  
K. Samwer ◽  
...  
Keyword(s):  
Glass Transition ◽  
Shear Modulus ◽  
Metallic Glasses

scholarly journals Elastic Properties and Glass Forming Ability of the Zr50Cu40Ag10 Metallic Alloy

2020 ◽  
Vol 310 ◽  
pp. 145-149 ◽  
Author(s):  
Ramil M. Khusnutdinoff ◽  
Anatolii V. Mokshin
Keyword(s):  
Glass Transition ◽  
Shear Modulus ◽  
Temperature Dependence ◽  
Elastic Properties ◽  
Metallic Glasses ◽  
Liquid Glass ◽  
Glass Forming Ability ◽  
Metallic Alloy ◽  
Poisson's Ratio ◽  
Glass Forming

The elastic properties of the Zr50Cu40Ag10 metallic alloy, such as the bulk modulus B, the shear modulus G, the Young’s modulus E and the Poisson’s ratio σ, are investigated by molecular dynamics simulation in the temperature range T=250–2000 K and at an external pressure of p=1.0 bar. It is shown that the liquid–glass transition is accompanied by a considerable increase in the shear modulus G and the Young’s modulus E (by more than 50%). The temperature dependence of the Poisson’s ratio exhibits a sharp fall from typical values for metals of approximately 0.32–0.33 to low values (close to zero), which are characteristic for brittle bulk metallic glasses. Non-monotonic temperature dependence of the longitudinal and transverse sound velocity near the liquid-glass transition is also observed. The glass forming ability of the alloy is evaluated in terms of the fragility index m. Its value is m≈64 for the Zr50Cu40Ag10 metallic glass, which is in a good agreement with the experimental data for the Zr-based metallic glasses.

scholarly journals Origin of embrittlement in metallic glasses

2016 ◽  
Vol 113 (37) ◽  
pp. 10257-10262 ◽  
Author(s):  
Glenn R. Garrett ◽  
Marios D. Demetriou ◽  
Maximilien E. Launey ◽  
William L. Johnson
Keyword(s):  
Fracture Toughness ◽  
Glass Transition ◽  
Metallic Glass ◽  
Shear Modulus ◽  
Metallic Glasses ◽  
Technological Advancement ◽  
Plane Strain Fracture Toughness ◽  
Strain Fracture ◽  
Equilibrium Configurations ◽  
Glass Compositions

Owing to their glassy nature, metallic glasses demonstrate a toughness that is extremely sensitive to the frozen-in configurational state. This sensitivity gives rise to “annealing embrittlement,” which is often severe and in many respects limits the technological advancement of these materials. Here, equilibrium configurations (i.e., “inherent states”) of a metallic glass are established around the glass transition, and the configurational properties along with the plane-strain fracture toughness are evaluated to associate the intrinsic glass toughness with the inherent state properties and identify the fundamental origin of embrittlement. The established correlations reveal a one-to-one correspondence between toughness and shear modulus continuous over a broad range of inherent states, suggesting that annealing embrittlement is controlled almost solely by an increasing resistance to shear flow. This annealing embrittlement sensitivity is shown to vary substantially between metallic glass compositions, and appears to correlate well with the fragility of the metallic glass.

Thermal behavior and glass transition of Zr-based bulk metallic glasses

2004 ◽  
Vol 375-377 ◽  
pp. 351-354 ◽  
Author(s):  
N. Mattern ◽  
U. Kühn ◽  
H. Hermann ◽  
S. Roth ◽  
H. Vinzelberg ◽  
...  
Keyword(s):  
Glass Transition ◽  
Thermal Behavior ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses

Reverse Plasticity in Nanoindentation

2007 ◽  
Vol 1049 ◽  
Author(s):  
Yongjiang Huang ◽  
Nursiani Indah Tjahyono ◽  
Jun Shen ◽  
Yu Lung Chiu
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Glass Transition ◽  
Single Crystal ◽  
Metallic Glasses ◽  
Deformation Mechanisms ◽  
Glass Transition Temperatures ◽  
Loading Rates ◽  
Nanoindentation Experiment ◽  
Properties Of Materials

AbstractThis paper summarises our recent cyclic nanoindentation experiment studies on a range of materials including single crystal and nanocrystalline copper, single crystal aluminium and bulk metallic glasses with different glass transition temperatures. The unloading and reloading processes of the nanoindentation curves have been analysed. The reverse plasticity will be discussed in the context of plastic deformation mechanisms involved. The effect of loading rates on the mechanical properties of materials upon cyclic loading will also be discussed.

scholarly journals Effects of Atomic Deviatoric Distortion on Local Glass Transition of Metallic Glasses

2005 ◽  
Vol 46 (12) ◽  
pp. 2848-2855 ◽  
Author(s):  
Junyoung Park ◽  
Yoji Shibutani ◽  
Shigenobu Ogata ◽  
Masato Wakeda
Keyword(s):  
Glass Transition ◽  
Metallic Glasses
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