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Title: Mechanical rejuvenation in bulk metallic glass induced by thermo-mechanical creep

Abstract

Using high energy X-ray diffraction we studied the temperature, stress, and time effect on structural changes in a Zr-based bulk metallic glass induced by thermo-mechanical creep. Pair distribution functions obtained from two-dimensional diffraction patterns show that thermo-mechanical creep induces structural disordering, but only when the stress beyond a threshold is applied. A similar threshold behavior was observed for anelastic strain. We conclude that anelastic creep strain induces rejuvenation, whereas plastic strain does not.

Authors:
 [1];  [1]; ORCiD logo [2];  [3];  [4]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Tohoku Univ., Sendai (Japan)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1429195
Alternate Identifier(s):
OSTI ID: 1496400
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 148; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Tong, Yang, Dmowski, W., Bei, Hongbin, Yokoyama, Y., and Egami, Takeshi. Mechanical rejuvenation in bulk metallic glass induced by thermo-mechanical creep. United States: N. p., 2018. Web. doi:10.1016/j.actamat.2018.02.019.
Tong, Yang, Dmowski, W., Bei, Hongbin, Yokoyama, Y., & Egami, Takeshi. Mechanical rejuvenation in bulk metallic glass induced by thermo-mechanical creep. United States. doi:10.1016/j.actamat.2018.02.019.
Tong, Yang, Dmowski, W., Bei, Hongbin, Yokoyama, Y., and Egami, Takeshi. Fri . "Mechanical rejuvenation in bulk metallic glass induced by thermo-mechanical creep". United States. doi:10.1016/j.actamat.2018.02.019. https://www.osti.gov/servlets/purl/1429195.
@article{osti_1429195,
title = {Mechanical rejuvenation in bulk metallic glass induced by thermo-mechanical creep},
author = {Tong, Yang and Dmowski, W. and Bei, Hongbin and Yokoyama, Y. and Egami, Takeshi},
abstractNote = {Using high energy X-ray diffraction we studied the temperature, stress, and time effect on structural changes in a Zr-based bulk metallic glass induced by thermo-mechanical creep. Pair distribution functions obtained from two-dimensional diffraction patterns show that thermo-mechanical creep induces structural disordering, but only when the stress beyond a threshold is applied. A similar threshold behavior was observed for anelastic strain. We conclude that anelastic creep strain induces rejuvenation, whereas plastic strain does not.},
doi = {10.1016/j.actamat.2018.02.019},
journal = {Acta Materialia},
number = C,
volume = 148,
place = {United States},
year = {2018},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: Effect of thermo-creep temperature on PDFs. Notice that the PDF measurements were conducted at room temperature on the samples after thermo-creep. The difference plot of G$^{0}_{0}$(𝑟) between the crept states and initial annealed state at the bottom is magnified by 15 times.

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.