| Surface patterning by thermoplastic forming of Ni-free Ti-based bulk metallic glasses Mariana Calin1; Supriya Bera1; Baran Sarac2; Juergen Eckert2; 1IFW DRESDEN, Dresden, Germany; 2ERICH SCHMID INSTITUTE OF MATERIALS SCIENCE, Leoben, Austria; PAPER: 285/SISAM/Regular (Oral) SCHEDULED: 14:50/Sat. 26 Oct. 2019/Dr. Christian Bernard ABSTRACT: Bulk metallic glasses (BMGs) exhibit a unique temperature-dependent mechanical behavior, which enables the processing of polymers at temperatures higher than the critical BMG-specific glass transition temperature [1]. In this work, we report on the thermoplastic behavior of two Ni-free Ti-based bulk metallic glasses by utilizing the dramatic softening of the amorphous structure in the supercooled liquid region. Ti<sub>40</sub>Zr<sub>10</sub>Cu<sub>34</sub>Pd<sub>14</sub>M<sub>2</sub> (M = Ga, Sn) bulk glassy alloys were produced by copper mold casting. Ga and Sn micro-alloying (2 at.%) improve the glass-forming ability and mechanical properties of Ti<sub>40</sub>Zr<sub>10</sub>Cu<sub>36</sub>Pd<sub>14</sub> alloy effectively [2, 3]. The cast rods were thermo-mechanically characterized to determine the most suitable processing temperature, time, and the load that has to be applied for thermoplastic net-shaping of the BMGs into anisotropically etched cavities of silicon chips. Periodic features with high surface smoothness and uniform height were created on the surface of the BMGs. The surface patterning with controllable roughness of Ti-based BMGs can be useful in biomedical studies by mediating material - cell interactions. Financial support through the EC (FP7 VitriMetTech-ITN) and ERC-Advanced Grant "INTELHIB" is gratefully acknowledged. References: [1] J. Schroers, Acta Mater. 56 (3) (2008) 471-478. [2] M. Calin, A. Gebert, A.C. Ghinea, P.F. Gostin, S. Abdi, C. Mickel, J. Eckert, Mat. Sci. Eng. C, 33 (2) (2013) 875-883. [3] B. Sarac, S. Bera, S. Balakin, M. Stoica, M. Calin, J. Eckert, Mater. Sci. Eng. C, 73 (2017) 398-405. |
