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Indian Institute of Technology (IIT) Patna 
DebrupaLahiri, Jeffrey Karp, Anup Kumar. Keshri, Cheng Zhang, George S.Dulikravich, Laszlo J. Kecskes, ArvindAgarwal 
Corresponding Authors:
Anup Kumar. Keshri 
DOI #: 
Scratch induced deformation behavior of hafnium based bulk metallic glass at multiple load scales 
Journal of Non-Crystalline Solids  
Bulk metallic glass, Hafnium, Multi-scale scratch behaviour, Shear band structure, Free volume, Strain hardening 
The scratch induced deformation behavior of Hafnium based bulk metallic glass (BMG) at micro- and macro-load scales is reported in this study. The micro-scratch deals with a normal load range of 1000–8000 μN, whereas the macro-scale scratches are made with a normal load reaching up to 5 N. Increase in the load beyond 2000 μN changes the deformation mechanism from plowing to fracture and chipping. The plastic strain is mostly accommodated by shear band formation with a significant amount of free volume generation. A change in the strain rate helps in the nucleation of shear bands and prevents fracture and chipping in the case of micro-scratches made at ramp loading as compared to constant load. Higher strain rate and heat generation in the track causes increased strain hardening in macro-scratch, which could be attributed to increased probability of nano-crystallization. Complex shear band structure is evolved during scratching, which is attributed to the mixed type of loading, consisting of compressive normal load and lateral shear load across scratch-track.  
Entered by:
Venkata Dantham on 2020-08-04 
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