Deformation-Mode-Sensitive Behavior of CuZr-Based Bulk Metallic Glasses Under Dynamic Loading

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Deformation-Mode-Sensitive Behavior of CuZr-Based Bulk Metallic Glasses Under Dynamic Loading AMIR REZVAN, BARAN SARAC, VIKTOR SOPRUNYUK, FLORIAN SPIECKERMANN, CHRISTOPH GAMMER, HUAPING SHENG, NIKOLAUS AUGUST SIFFERLINGER, and JU¨RGEN ECKERT The viscoelastic behavior of four different bulk metallic glass (BMG) systems, i.e., Cu46Zr46Al8, Cu44Zr44Al8Co4, Cu44Zr44Al8Hf4, and Cu44Zr44Al8Co2Hf2, is investigated concerning its deformation-mode dependence via dynamic mechanical analysis (DMA) in 3-point bending (TPB), tension, and torsion modes. At temperatures below the glass transition, the considered BMGs deform primarily elastic, and the mechanical response is independent of the testing frequency, whereas, in the glass transition region, the viscoelastic component dominates. Crystallization decreases the viscoelastic contribution, whereas plastic deformation leads to an increase in atomic mobility for all three deformation modes. Compared to tension and torsion, TPB is found to be more sensitive to dynamic mechanical stress. TPB generates a complex stress state in the matrix and can thus introduce substantial variations in loss modulus. Structural analyses carried out by transmission electron microscopy and X-ray diffraction confirmed the amorphous nature of the base composition and structural changes when heated to the intermediate peak temperature observed at 743 K for the TPB mode. Compared to Cu46Zr46Al8, 4 at. pct Co addition in the Cu46x\2Zr46x\2Al8Cox amorphous alloy leads to a glass showing relatively higher thermomechanical stability around its glass transition. This study provides evidence for the enhancement of the mechanical properties of CuZr-based BMGs at elevated temperatures by microalloying. https://doi.org/10.1007/s11661-020-06048-w  The Minerals, Metals & Materials Society and ASM International 2020

I. AMIR REZVAN is with the Erich Schmid Institute of Materials Science, Austrian Academy of Sciences (O¨AW), Jahnstraße 12, A-8700 Leoben, Austria and also with the Department of Materials Science, Chair of Materials Physics, Montanuniversita¨t Leoben, Jahnstraße 12, A-8700 Leoben, Austria. BARAN SARAC, CHRISTOPH GAMMER and HUAPING SHENG are with the Erich Schmid Institute of Materials Science, Austrian Academy of Sciences (O¨AW). Contact e-mail: [email protected] VIKTOR SOPRUNYUK is with the Erich Schmid Institute of Materials Science, Austrian Academy of Sciences (O¨AW) and also with the University of Vienna, Faculty of Physics, Physics of Functional Materials, Boltzmanngasse 5, A-1090 Wien, Austria. FLORIAN SPIECKERMANN is with the Department of Materials Science, Chair of Materials Physics, Montanuniversita¨t Leoben. NIKOLAUS AUGUST SIFFERLINGER is with the Department of Mineral Resources Engineering, Chair of Mining Engineering and Mineral Economics, Montanuniversita¨t Leoben, Franz-Josef-Straße 18 A-8700 Leoben, Austria. JU¨RGEN ECKERT is with the Erich Schmid Institute of Materials Science, Austrian Academy of Sciences (O¨AW) and also with the Department of Materials Science, Chair of Mater

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