Indentation of Bulk Amorphous Metals to Investigate Pop-In Effects

Report No. ARL-CR-574
Authors: Tyler Krus, Thomas Juliano, and Mark VanLandingham
Date/Pages: July 2006; 22 pages
Abstract: Bulk metallic glasses (BMG) are a fairly new class of materials that exhibit high strength, low density, and corrosive resistance, as compared to traditional metals, and are useful for various applications. Spherical depth-sensing indentation of BMG reveals stepwise displacement jumps in the load-displacement curves, known as ?pop-ins.? These pop-ins have been found to be correlated with plastic deformation; the initial one being associated with the elastic limit of the material. The initial displacement bursts are investigated for varying stoichiometries of Zr and Hf-based BMG. Attention is focused on pressure and energy per volume at initial pop-in location as a function of different strain rates, indenter tip radius, and material composition. This research may provide further insight and understanding for macroscale behavior of BMG.
Distribution: Approved for public release
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Last Update / Reviewed: July 1, 2006