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Effects of Annealing on Dynamic Behavior of a Bulk Metallic Glass

[+] Author Affiliations
George P. Sunny, Vikas Prakash, John J. Lewandowski

Case Western Reserve University

Paper No. IMECE2005-83016, pp. 131-137; 7 pages
doi:10.1115/IMECE2005-83016
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Applied Mechanics
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-4212-6 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

abstract

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, Zr41.25 Ti13.75 Ni10 Cu12.5 Be22.5 , 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.

Copyright © 2005 by ASME

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