A theoretical study of vibrational dynamics of Ti60Zr16V9Cu3Al3Be9 hexanary bulk metallic glass by pseudopotential theory and estimation of thermodynamic and elastic properties using BS approach

2020 ◽  
Author(s):  
Alkesh L. Gandhi ◽  
Aditya M. Vora
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Elastic Properties ◽  
Theoretical Study ◽  
Vibrational Dynamics ◽  
Pseudopotential Theory

Elastic Properties of Zr50Cu43Ag7 Bulk Metallic Glass Using Pseudopotential Theory

2016 ◽  
Vol 1141 ◽  
pp. 232-235
Author(s):  
Chaudhari Prakruti ◽  
Payal N. Chauhan ◽  
R.H. Joshi ◽  
Nisarg K. Bhatt ◽  
Brijmohan Y. Thakore
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Elastic Properties ◽  
Young Modulus ◽  
Pseudopotential Theory ◽  
Transverse Modes ◽  
Local Field Correction ◽  
Proposed Model ◽  
Model Pseudopotential ◽  
Good Agreement

Using Hubbard-Beeby approach for phonon dynamics, in conjunction with our recently proposed model pseudopotential; phonon frequencies for longitudinal and transverse modes are computed and associated elastic properties of technologically important Zr-based Zr50Cu43Ag7 bulk metallic glass (BMG) are evaluated. Five different forms of the static local field correction functions, viz., Hartree etal. (H), Taylor et al. (T), Ichimaru and Utsumi et al. (IU), Farid et al. (F) and Sarkar et al. (S) are employed to investigate the influence of the screening effect on the vibrational dynamics of Zr50Cu43Ag7 BMG. Results for bulk modulus, modulus of rigidity, Poisson's ratio, Young modulus, propagation velocity of elastic waves and dispersion curves are studied. The theoretical computations are found to be in good agreement with the available experimental results, which confirms the use of our model pseudopotential to study elastic properties of such a glassy system.

scholarly journals Low Temperature Elastic Properties of CuZrTi Bulk Metallic Glass

2007 ◽  
Vol 48 (7) ◽  
pp. 1842-1845 ◽  
Author(s):  
R. Tarumi ◽  
M. Hirao ◽  
T. Ichitsubo ◽  
E. Matsubara ◽  
J. Saida ◽  
...  
Keyword(s):  
Low Temperature ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Elastic Properties

Vibrational and Elastic Properties of Bulk Metallic Glass: Application to Pd64Fe16P20

2016 ◽  
Vol 1141 ◽  
pp. 91-95 ◽  
Author(s):  
Payal N. Chauhan ◽  
Chaudhari Prakruti ◽  
R.H. Joshi ◽  
Nisarg K. Bhatt ◽  
Brijmohan Y. Thakore
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Elastic Properties ◽  
Elastic Moduli ◽  
Nearest Neighbor ◽  
Phonon Dispersion ◽  
Phonon Dispersion Curve ◽  
The Core ◽  
Realistic Assumption ◽  
Model Pseudopotential

Different elastic properties of Pd-based Pd64Fe16P20 have been computed using two different forms of pseudopotential. Both the forms differ within the core region suggesting different degrees of orthogonalization and its r-dependence, while outside the core both preserves the Columbic nature. The only parameter, the core radius, separates these regions, and it is calculated using the realistic assumption based on the nearest neighbor distance. Further, five different forms of the local field correlated functions, namely, Hartree (H), Taylor (T), Ichimaru and Utsumi (IU), Farid et al. (F) and Sarkar et al. (S) are examined for better understanding regarding the screening effect on different elastic constants for Pd64Fe16P20 bulk metallic glass. The calculated results for the various elastic moduli, Poisson's ratio, sound velocity and phonon dispersion curve are all found to be in general agreement with the available experimental data. This confirms the applicability of the model pseudopotential to bulk metallic systems.

scholarly journals Thermal and elastic properties of Cu–Zr–Be bulk metallic glass forming alloys

2007 ◽  
Vol 90 (21) ◽  
pp. 211901 ◽  
Author(s):  
Gang Duan ◽  
Mary Laura Lind ◽  
Katrien De Blauwe ◽  
Aaron Wiest ◽  
William L. Johnson
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Elastic Properties ◽  
Glass Forming

Phonon Excitations in Pd40Ni40P20 Bulk Metallic Glass by Inelastic X-Ray Scattering

2016 ◽  
Vol 879 ◽  
pp. 767-772 ◽  
Author(s):  
Shinya Hosokawa ◽  
Masanori Inui ◽  
Yukio Kajihara ◽  
Tetsu Ichitsubo ◽  
Kazuhiro Matsuda ◽  
...  
Keyword(s):  
Dispersion Relation ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Elastic Properties ◽  
Excitation Energies ◽  
Longitudinal Acoustic ◽  
X Ray ◽  
X Ray Scattering ◽  
Transverse Acoustic ◽  
Ray Scattering

To clarify microscopic elastic properties of a Pd40Ni40P20 bulk metallic glass, inelastic X-ray scattering (IXS) experiments were carried out using high-resolution IXS spectrometer installed at BL35XU/SPring-8. Clear longitudinal acoustic (LA) excitation modes are observed in the whole momentum transfer Q range up to ~22 nm-1. The microscopic sound velocity of the LA modes obtained from the Q → 0 limit of the dispersion relation is about 12% faster than the macroscopic value, suggesting the microscopic heterogeneity in the elastic properties of this BMG. In addition, transverse acoustic (TA) modes can be deduced from a detailed analysis of the IXS spectra. The microscopic Poisson’s ratio obtained from the ratio of the excitation energies of the TA and LA modes is 0.47 ± 0.04, larger than the macroscopic value of 0.40. Thus, the fragile nature of this BMG already found in the macroscopic sense is much enhanced in the microscopic view.

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