Bulk metallic glasses are excellent candidate materials for integral armor because of their high strength and large elastic strain. Also, annealed glasses exhibit higher yield strengths than their fully amorphous counterparts. Therefore, the dynamic behavior of an annealed bulk metallic glass, Zr41.25Ti13.75Ni10Cu12.5Be22.5, was investigated in this study. A Split-Hopkinson Pressure Bar (SHPB) was employed to determine the stress-strain response at strain rates varying from 500/s-2000/s for the annealed glass. Also, a high-speed camera was utilized to obtain in-situ video of the specimen during the deformation process. These results were then compared to similar tests on the fully amorphous material. Finally, a new specimen design and experimental setup was proposed to promote accurate measurements from SHPB tests. During dynamic loading, the strain to failure increased as the strain-rate was increased, and the changes in strain-rate produced a larger effect than that of the annealing treatment on the failure strain. Maximum stresses were generally higher for the annealed glass, although there was some scatter. Finally, while an instability formed a dominant shear band for the as-received material, extensive fragmentation characterized the deformation after formation of an initial crack.

Volume Subject Area:
Applied Mechanics
Keywords:
Bulk metallic glass, Split-Hopkinson Pressure Bar, annealing effects, dynamic loading
Topics:
Annealing, Dynamic testing (Materials), Metallic glasses, Pressure
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