Shear-band-to-crack transition in bulk metallic glasses under quasi-static and dynamic shearing

2019 ◽  
Vol 521 ◽  
pp. 119484 ◽  
Author(s):  
Ding Zhou ◽  
Xianhang Zhao ◽  
Bingjin Li ◽  
Naidan Hou ◽  
Zihao Ma ◽  
...  
Keyword(s):  
Shear Band ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Crack Transition ◽  
Dynamic Shearing

scholarly journals Tension-Tension Fatigue Behavior of High-Toughness Zr61Ti2Cu25Al12 Bulk Metallic Glass

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2815
Author(s):  
Yu Hang Yang ◽  
Jun Yi ◽  
Na Yang ◽  
Wen Liang ◽  
Hao Ran Huang ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Shear Band ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Fatigue Resistance ◽  
Metallic Glasses ◽  
Stress Amplitude ◽  
Fatigue Behavior ◽  
Bulk Metallic Glasses ◽  
High Toughness

Bulk metallic glasses have application potential in engineering structures due to their exceptional strength and fracture toughness. Their fatigue resistance is very important for the application as well. We report the tension-tension fatigue damage behavior of a Zr61Ti2Cu25Al12 bulk metallic glass, which has the highest fracture toughness among BMGs. The Zr61Ti2Cu25Al12 glass exhibits a tension-tension fatigue endurance limit of 195 MPa, which is higher than that of high-toughness steels. The fracture morphology of the specimens depends on the applied stress amplitude. We found flocks of shear bands, which were perpendicular to the loading direction, on the surface of the fatigue test specimens with stress amplitude higher than the fatigue limit of the glass. The fatigue cracking of the glass initiated from a shear band in a shear band flock. Our work demonstrated that the Zr61Ti2Cu25Al12 glass is a competitive structural material and shed light on improving the fatigue resistance of bulk metallic glasses.

Flow serration and shear-band propagation in bulk metallic glasses

2009 ◽  
Vol 94 (14) ◽  
pp. 141914 ◽  
Author(s):  
H. M. Chen ◽  
J. C. Huang ◽  
S. X. Song ◽  
T. G. Nieh ◽  
J. S. C. Jang
Keyword(s):  
Shear Band ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses

Origin of Intermittent Plastic Flow and Instability of Shear Band Sliding in Bulk Metallic Glasses

2013 ◽  
Vol 110 (22) ◽  
Author(s):  
B. A. Sun ◽  
S. Pauly ◽  
J. Hu ◽  
W. H. Wang ◽  
U. Kühn ◽  
...  
Keyword(s):  
Shear Band ◽  
Plastic Flow ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses

Effect of Minor Addition of Noble Elements on Microstructure and Mechanical Properties of Ti-Based Bulk Metallic Glasses

2011 ◽  
Vol 148-149 ◽  
pp. 241-244 ◽  
Author(s):  
Feng Xiang Qin ◽  
Guo Qiang Xie ◽  
Zhen Hua Dan ◽  
Akihisa Inoue
Keyword(s):  
Mechanical Properties ◽  
Plastic Strain ◽  
Shear Band ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
High Strength ◽  
Copper Mold ◽  
Copper Mold Casting ◽  
Minor Addition ◽  
Mold Casting

Ti-based bulk metallic glasses with minor addition of Ag, Au or Pt elements were prepared by copper mold casting. The Microstructure of the as-cast samples was examined by TEM. Nanoparticles identified as cubic Pd3Ti with crystal planes of (111), (200), (220) and (311) are observed in all the alloys modified by the minor addition of Ag, Au or Pt. The results revealed that the glassy/nanoparticle composited alloys exhibited high strength about 2000 MPa and plastic strain between 1.5-10% due to the inhibition of propagation of shear band.

Localized heating and fracture criterion for bulk metallic glasses

2006 ◽  
Vol 21 (4) ◽  
pp. 915-922 ◽  
Author(s):  
B. Yang ◽  
C.T. Liu ◽  
T.G. Nieh ◽  
M.L. Morrison ◽  
P.K. Liaw ◽  
...  
Keyword(s):  
Shear Band ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Zone Model ◽  
Transformation Zone ◽  
Localized Heating ◽  
Instantaneous Temperature ◽  
Shear Transformation ◽  
New Criterion

In this study, we demonstrated that the failure of bulk metallic glasses (BMGs) results from a sudden temperature rise within a shear band. Using a shear transformation zone model, we successfully calculated the temperature within a shear band and found it consistent with the observation from an in situ infrared thermographic system. The instantaneous temperature within a shear band at fracture agrees remarkably well with the glass transition temperature (Tg providing a new criterion to determine the strength of BMGs from their Tg. This agreement also discloses the fact that catastrophic failure of BMG is caused by the sudden drop in viscosity inside the shear band when the instantaneous temperature within a shear band approaches Tg.

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