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

Author(s)
Amir Rezvan, Baran Sarac, Viktor Soprunyuk, Florian Spieckermann, Christoph Gammer, Huaping Sheng, Nikolaus August Sifferlinger, Jürgen Eckert
Abstract

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 Cu46-x\2Zr46-x\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.

Organisation(s)
Physics of Functional Materials
External organisation(s)
Österreichische Akademie der Wissenschaften (ÖAW), Montanuniversität Leoben
Journal
Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science
Volume
52
Pages
8-13
No. of pages
6
ISSN
1073-5623
DOI
https://doi.org/10.1007/s11661-020-06048-w
Publication date
11-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/deformationmodesensitive-behavior-of-cuzrbased-bulk-metallic-glasses-under-dynamic-loading(1b31cc98-5381-4392-a0c7-fb68c46ca5eb).html