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High strain rate and fatigue testing of bulk metallic glass

The goal of this project is the investigation of interplay between the atomic-scale chemistry and the strain rate in affecting the deformation response of Zr-based BMGs. Of special interest are the shear transformation zone nucleation in the elastic regime and the shear band propagation in the plastic regime of BMGs.

Bulk metallic glasses (BMGs) are a class of amorphous materials with superior mechanical properties compared to their crystalline counterparts. The goal of this project is to investigate the interplay between the atomic-scale chemistry and the strain rate in affecting the deformation response of Zr-based BMGs. Specifically, the shear transformation zone nucleation in the elastic regime and the shear band propagation in the plastic regime of BMGs will be explored. This will be achieved via a series of micromechanical tests including:

  •  Dynamic micropillar compression from a strain rate of 0.001/s upto 1000/s

  • Micropillar high cycle fatigue upto 1kHz frequencies

  • Constant strain rate dynamic nanoindentation upto 2000/s

Quasi-static testing of BMG micropillar at a strain rate of 0.1/s

High strain rate testing of BMG micropillar at a strain rate of ~500/s

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