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Title: Negative strain rate sensitivity in bulk metallic glass and its similarities with the dynamic strain aging effect during deformation

Abstract

Detailed investigations were carried out on the deformation behavior of Zr-based monolithic bulk metallic glass and bulk metallic glass matrix composites. The latter, due to splitting and multiplication of shear bands, exhibits larger compressive strains than the former, without significant loss of strength. Serrated flow in conjunction with a negative strain rate sensitivity was observed in both materials. This observation, together with an increase in stress drops with increasing strain and their decrease with increasing strain rate, indicates phenomenologically close similarities with the dynamic strain aging deformation mechanism known for crystalline solids. The micromechanical mechanism of a shear event is discussed in light of these results.

Authors:
; ; ;  [1]
  1. Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
20883198
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 89; Journal Issue: 9; Other Information: DOI: 10.1063/1.2234309; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; COMPOSITE MATERIALS; COMPRESSION STRENGTH; COPPER ALLOYS; DEFORMATION; METALLIC GLASSES; NICKEL ALLOYS; SENSITIVITY; STRAIN AGING; STRAIN RATE; STRAINS; STRESSES; TITANIUM ALLOYS; ZIRCONIUM ALLOYS

Citation Formats

Dalla Torre, Florian H, Dubach, Alban, Siegrist, Marco E, and Loeffler, Joerg F. Negative strain rate sensitivity in bulk metallic glass and its similarities with the dynamic strain aging effect during deformation. United States: N. p., 2006. Web. doi:10.1063/1.2234309.
Dalla Torre, Florian H, Dubach, Alban, Siegrist, Marco E, & Loeffler, Joerg F. Negative strain rate sensitivity in bulk metallic glass and its similarities with the dynamic strain aging effect during deformation. United States. https://doi.org/10.1063/1.2234309
Dalla Torre, Florian H, Dubach, Alban, Siegrist, Marco E, and Loeffler, Joerg F. 2006. "Negative strain rate sensitivity in bulk metallic glass and its similarities with the dynamic strain aging effect during deformation". United States. https://doi.org/10.1063/1.2234309.
@article{osti_20883198,
title = {Negative strain rate sensitivity in bulk metallic glass and its similarities with the dynamic strain aging effect during deformation},
author = {Dalla Torre, Florian H and Dubach, Alban and Siegrist, Marco E and Loeffler, Joerg F},
abstractNote = {Detailed investigations were carried out on the deformation behavior of Zr-based monolithic bulk metallic glass and bulk metallic glass matrix composites. The latter, due to splitting and multiplication of shear bands, exhibits larger compressive strains than the former, without significant loss of strength. Serrated flow in conjunction with a negative strain rate sensitivity was observed in both materials. This observation, together with an increase in stress drops with increasing strain and their decrease with increasing strain rate, indicates phenomenologically close similarities with the dynamic strain aging deformation mechanism known for crystalline solids. The micromechanical mechanism of a shear event is discussed in light of these results.},
doi = {10.1063/1.2234309},
url = {https://www.osti.gov/biblio/20883198}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 9,
volume = 89,
place = {United States},
year = {Mon Aug 28 00:00:00 EDT 2006},
month = {Mon Aug 28 00:00:00 EDT 2006}
}