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Title: Shear-band cavities and strain hardening in a metallic glass revealed with phase-contrast x-ray tomography

Abstract

Using high-energy x-ray tomography we show that deformed Zr-based metallic-glass samples contain large amounts of shear-band cavities (internal cracks). Since the investigated samples were unloaded prior to fracture, the three-dimensionally reconstructed samples can be used to determine the true load-bearing area, which leads to the conclusion that the samples have hardened considerably during deformation. We propose how such apparent strain hardening can be caused by a change in friction condition between the detached surfaces instead of searching for an intrinsic hardening mechanism. These results indicate the importance of knowing the true load-bearing area for correct flow-stress determinations of metallic glasses.

Authors:
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Materials Science and Engineering
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
University of Illinois, Urbana-Champaign, IL (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1559872
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 170; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
cavities; fracture; metallic glass; shear bands; x-ray tomography

Citation Formats

Liu, C., Das, A., Wang, W., Küchemann, S., Kenesei, P., and Maaß, R. Shear-band cavities and strain hardening in a metallic glass revealed with phase-contrast x-ray tomography. United States: N. p., 2019. Web. doi:10.1016/j.scriptamat.2019.05.021.
Liu, C., Das, A., Wang, W., Küchemann, S., Kenesei, P., & Maaß, R. Shear-band cavities and strain hardening in a metallic glass revealed with phase-contrast x-ray tomography. United States. doi:10.1016/j.scriptamat.2019.05.021.
Liu, C., Das, A., Wang, W., Küchemann, S., Kenesei, P., and Maaß, R. Sun . "Shear-band cavities and strain hardening in a metallic glass revealed with phase-contrast x-ray tomography". United States. doi:10.1016/j.scriptamat.2019.05.021.
@article{osti_1559872,
title = {Shear-band cavities and strain hardening in a metallic glass revealed with phase-contrast x-ray tomography},
author = {Liu, C. and Das, A. and Wang, W. and Küchemann, S. and Kenesei, P. and Maaß, R.},
abstractNote = {Using high-energy x-ray tomography we show that deformed Zr-based metallic-glass samples contain large amounts of shear-band cavities (internal cracks). Since the investigated samples were unloaded prior to fracture, the three-dimensionally reconstructed samples can be used to determine the true load-bearing area, which leads to the conclusion that the samples have hardened considerably during deformation. We propose how such apparent strain hardening can be caused by a change in friction condition between the detached surfaces instead of searching for an intrinsic hardening mechanism. These results indicate the importance of knowing the true load-bearing area for correct flow-stress determinations of metallic glasses.},
doi = {10.1016/j.scriptamat.2019.05.021},
journal = {Scripta Materialia},
number = C,
volume = 170,
place = {United States},
year = {2019},
month = {9}
}

Journal Article:
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This content will become publicly available on September 1, 2020
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