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Bulk Metallic Glasses XVIII: Poster Session
Sponsored by: TMS Structural Materials Division, TMS: Mechanical Behavior of Materials Committee
Program Organizers: Peter Liaw, University of Tennessee; Yanfei Gao, University of Tennessee-Knoxville; Hahn Choo, University of Tennessee; Yunfeng Shi, Rensselaer Polytechnic Institute; Robert Maass, Federal Institute of Materials Research and Testing (BAM); Xie Xie, FCA US LLC; Gongyao Wang, Globus Medical

Monday 5:30 PM
March 15, 2021
Room: RM 7
Location: TMS2021 Virtual

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Effect of Porosity Level on the Mechanical Properties of Bicontinuous Nanoporous Metallic Glasses: Chang Liu¹; Paulo Branicio¹; ¹University of Southern California
    Bicontinuous nanoporous metallic glasses, as newly developed materials, take advantage of the unique characteristics of metallic glasses (MGs) and open-cell nanoporous structures. We investigate the mechanical properties of bicontinuous nanoporous Cu₆₄Zr₃₆ MG using tensile loading molecular dynamics simulations. By varying the porosity of the material in the range 0.2 < φ < 0.7, we find that for low porosity level, φ < 0.2, closed-cell pores enhance the MG ductility. An increase in the porosity level (φ > 0.2) to generate an open-cell bicontinuous topology induces a brittle-to-ductile transition, shifting the deformation and failure mechanism from a single critical shear-band to necking and rupture of ligaments. A scaling law based on the tensile deformation of the ligaments and the Gibson-Ashby theory can account for the dependence of Young’s modulus with porosity.

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