Numerical study of the notch effect on the malleability of bulk metallic glasses based on the free-volume theory

2016 ◽  
Vol 31 (6) ◽  
pp. 765-774 ◽  
Author(s):  
Yunpeng Jiang
Keyword(s):  
Free Volume ◽  
Metallic Glasses ◽  
Numerical Study ◽  
Bulk Metallic Glasses ◽  
Notch Effect ◽  
Free Volume Theory ◽  
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Abstract

scholarly journals Notch Effect on Plastic Deformation of Metallic Glass: A Numerical Study by Revised Free-Volume Theory

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
J. F. Yan ◽  
W. J. Meng ◽  
Z. Chen ◽  
H. Guo ◽  
X. G. Yan
Keyword(s):  
Metallic Glass ◽  
Free Volume ◽  
Numerical Study ◽  
Shear Bands ◽  
Notch Effect ◽  
Volume Distribution ◽  
Free Volume Theory ◽  
Tension And Compression ◽  
Strength Asymmetry ◽  
Strength And Plasticity

By means of a revised free-volume theory, the notch effect on metallic glass was systematically investigated by the numerical method. Simulations on specimens without notches demonstrated that the parameters being determined in this work could reasonably describe the strength asymmetry of tension and compression. Moreover, four samples with different notches were used to numerically investigate the notch effect on global strength and plasticity. A better agreement could also be achieved between current simulations with existing experimental results, compared with another free-volume model. Combined with the free-volume distribution during deformation process, it was proven that the intersection of two major shear bands is the cause for the strength and plasticity enhancement found in sample with two symmetric notches. Besides, strength asymmetry between tension and compression was also found for notched samples. Compressive strengths are accordingly higher than tensile ones. Moreover, with the augment of the aspect ratio, the plasticity for specimens with two symmetric notches was found to increase firstly and then decrease afterwards.

Characteristic free volume change of bulk metallic glasses

2012 ◽  
Vol 111 (8) ◽  
pp. 083523 ◽  
Author(s):  
Qiang Hu ◽  
Xie-Rong Zeng ◽  
M. W. Fu
Keyword(s):  
Free Volume ◽  
Volume Change ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses

Stability of shear banding process in bulk metallic glasses and composites

2017 ◽  
Vol 32 (13) ◽  
pp. 2560-2569 ◽  
Author(s):  
Yusheng Qin ◽  
Xiaoliang Han ◽  
Kaikai Song ◽  
Li Wang ◽  
Yun Cheng ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Shear Banding ◽  
Bulk Metallic Glasses ◽  
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Abstract

scholarly journals Numerical Study on the Fatigue Limit of Metallic Glasses under Cyclic Tension-Compression Loading

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1732
Author(s):  
Jinfeng Yan ◽  
Wenjun Meng ◽  
Zhi Chen ◽  
Hong Guo ◽  
Xianguo Yan
Keyword(s):  
Fatigue Life ◽  
Metallic Glass ◽  
Fatigue Limit ◽  
Free Volume ◽  
Strain Amplitude ◽  
Numerical Study ◽  
Hydrostatic Stress ◽  
Shear Banding ◽  
Engineering Application ◽  
Free Volume Theory

Numerical study was performed to determine the fatigue limit of metallic glass under tension-compression cyclic loading. A revised free-volume theory which considers the hydrostatic stress was utilized to make the predictions. Systematical simulations showed that a higher strain amplitude is prone to making the sample completely damaged earlier. However, lower strain fluctuations could result in a longer fatigue life. Shear banding evolution history described by free-volume localization could reasonably explain the mechanical responses of different samples. In addition, compressive loading could give rise to a higher stress than that under tensile loading because of hydrostatic stress contribution. In the end, a correlation between fatigue life and applied strain amplitude was plotted which could supply a guidance for designing the engineering application of metallic glass under periodic loading.

Effect of Al and Ag addition on phase formation, thermal stability, and mechanical properties of Cu–Zr-based bulk metallic glasses

2011 ◽  
Vol 26 (14) ◽  
pp. 1702-1710 ◽  
Author(s):  
Nilam Barekar ◽  
Piter Gargarella ◽  
Kaikai Song ◽  
Simon Pauly ◽  
Uta Kühn ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Phase Formation ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Ag Addition ◽  
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Abstract

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