scholarly journals Influence of Vibrational Loading on Deformation Behavior of Metallic Glass: A Molecular Dynamics Study

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1197 ◽  
Author(s):  
Mao Zhang ◽  
Qiaomin Li ◽  
Jiacheng Zhang ◽  
Xinyun Wang ◽  
Junsong Jin ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glass ◽  
High Frequency ◽  
Deformation Behavior ◽  
Elastoplastic Deformation ◽  
Accelerated Aging ◽  
Vibrational Loading ◽  
Average Deformation ◽  
Acoustic Softening ◽  
Β Relaxation

The influence of vibrational loading on the deformation behavior of a Zr50Cu46Al4 metallic glass (MG) was characterized via molecular dynamics approaches. High-frequency (1 GHz) vibrational loading was imposed on the elastoplastic deformation stage during the uniaxial tension of the MG conducted at 50 K. It was found that imposing vibrational loading scarcely reduces the average deformation resistance. On the contrary, it results in a notable residual hardening effect after the vibrational loading is removed, which differs significantly from the previously reported acoustic softening mechanisms. Vibrational loading can increase the fraction of STZed atoms and enhance the shear localization degree, which is beneficial to the shear deformation of MGs. Meanwhile, the influence of vibrational loading on the local microstructure of MG is negligible. A plausible explanation of these phenomena is given by considering the accelerated aging of MG stemming from the β relaxation.

Microscopic Study on the Mechanism of Ultrasonic Nanowelding

2010 ◽  
Vol 97-101 ◽  
pp. 3928-3931 ◽  
Author(s):  
Xuan Liu ◽  
Li Jie Zhao ◽  
Hua Zhou
Keyword(s):  
Molecular Dynamics ◽  
High Frequency ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Single Wall Carbon Nanotubes ◽  
Metal Electrodes ◽  
Softening Effect ◽  
Acoustic Softening ◽  
Dynamics Method ◽  
Ultrasonic Parameter

Using molecular dynamics method, the progress of bonding single-wall carbon nanotubes and metal electrodes by ultrasonic nanowelding technique is described completely at atomistic length scales. The temperature distribution in electrodes is analyzed. The maximal temperature of electrode atoms is about 570.1K. The mechanism responsible for ultrasonic nanowelding is revealed as the result of the high-frequency ultrasonic energy softening the metal and causing plastic deformation of the metal under the clamping stress because of the ‘acoustic softening effect’. The ultrasonic parameter is optimized, which is important in improving the performance of carbon nanotube field-effect transistors and building reliable nanodevices.

scholarly journals Deformation behavior of annealed Cu64Zr36 metallic glass via molecular dynamics simulations

2020 ◽  
Vol 191 ◽  
pp. 108660 ◽  
Author(s):  
Xingxing Yue ◽  
Jamieson Brechtl ◽  
Fajie Wang ◽  
Zexin Chang ◽  
Peter K. Liaw ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glass ◽  
Molecular Dynamics Simulations ◽  
Deformation Behavior ◽  
Dynamics Simulations

Interfacial bonding of CuZr metallic glass via oxide: A molecular dynamics study

2021 ◽  
Vol 182 ◽  
pp. 109275
Author(s):  
Mao Zhang ◽  
Hongjun Cai ◽  
Jiacheng Zhang ◽  
Qiaomin Li ◽  
Ying Wang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Metallic Glass ◽  
Interfacial Bonding

Main α relaxation and slow β relaxation processes in a La30Ce30Al15Co25 metallic glass

2019 ◽  
Vol 35 (6) ◽  
pp. 982-986 ◽  
Author(s):  
J.C. Qiao ◽  
Y.H. Chen ◽  
R. Casalini ◽  
J.M. Pelletier ◽  
Y. Yao
Keyword(s):  
Metallic Glass ◽  
Relaxation Processes ◽  
Β Relaxation

High-density liquid-like component facilitates plastic flow in a model amorphous silicon system

2003 ◽  
Vol 806 ◽  
Author(s):  
Michael J. Demkowicz ◽  
Ali S. Argon
Keyword(s):  
Molecular Dynamics ◽  
Plastic Flow ◽  
Deformation Behavior ◽  
Strain Softening ◽  
Low Density ◽  
Unstressed State ◽  
Plastic Deformation Behavior ◽  
Silicon System ◽  
Amorphous Si ◽  
Dynamics Simulations

ABSTRACTMolecular dynamics simulations show that plastic deformation behavior of model Stillinger-Weber amorphous Si is very sensitive to the density of the initial unstressed state. Low-density systems exhibit a pronounced yield phenomenon, strain softening, and a dramatic drop in pressure during deformation at constant volume. This behavior is explained by the interplay in every system of the prevailing solid-like and liquid-like components, with the latter being denser and more amenable to plastic flow.

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