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Title: Medium-range structure and glass forming ability in Zr–Cu–Al bulk metallic glasses

Abstract

Fluctuation electron microscopy experiments combined with hybrid reverse Monte Carlo modeling show a correlation between medium-range structure at the nanometer scale and glass forming ability in two Zr–Cu–Al bulk metallic glass (BMG) alloys. Both Zr50Cu35Al15 and Zr50Cu45Al5 exhibit two nanoscale structure types, one icosahedral and the other more crystal-like. In Zr50Cu35Al15, the poorer glass former, the crystal-like structure is more stable under annealing below the glass transition temperature, Tg, than in Zr50Cu45Al5. Variable resolution fluctuation microscopy of the MRO clusters show that in Zr50Cu35Al15 on sub-Tg annealing, the crystal-like clusters shrink even as they grow more ordered, while icosahedral-like clusters grow. Furthermore, the results suggest that achieving better glass forming ability in this alloy system may depend more on destabilizing crystal-like structures than enhancing non-crystalline structures.

Authors:
 [1];  [1];  [2];  [2]; ORCiD logo [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1254301
Alternate Identifier(s):
OSTI ID: 1357658
Report Number(s):
IS-J-8990
Journal ID: ISSN 1359-6454; PII: S1359645416300799
Grant/Contract Number:  
DMR1205899; CMMI1232731; DMR1121288; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 109; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; fluctuation electron microscopy; medium range order; metallic glass; glass forming ability; hybrid reverse Monte Carlo

Citation Formats

Zhang, Pei, Maldonis, Jason J., Besser, M. F., Kramer, M. J., and Voyles, Paul M. Medium-range structure and glass forming ability in Zr–Cu–Al bulk metallic glasses. United States: N. p., 2016. Web. doi:10.1016/j.actamat.2016.02.006.
Zhang, Pei, Maldonis, Jason J., Besser, M. F., Kramer, M. J., & Voyles, Paul M. Medium-range structure and glass forming ability in Zr–Cu–Al bulk metallic glasses. United States. https://doi.org/10.1016/j.actamat.2016.02.006
Zhang, Pei, Maldonis, Jason J., Besser, M. F., Kramer, M. J., and Voyles, Paul M. Sat . "Medium-range structure and glass forming ability in Zr–Cu–Al bulk metallic glasses". United States. https://doi.org/10.1016/j.actamat.2016.02.006. https://www.osti.gov/servlets/purl/1254301.
@article{osti_1254301,
title = {Medium-range structure and glass forming ability in Zr–Cu–Al bulk metallic glasses},
author = {Zhang, Pei and Maldonis, Jason J. and Besser, M. F. and Kramer, M. J. and Voyles, Paul M.},
abstractNote = {Fluctuation electron microscopy experiments combined with hybrid reverse Monte Carlo modeling show a correlation between medium-range structure at the nanometer scale and glass forming ability in two Zr–Cu–Al bulk metallic glass (BMG) alloys. Both Zr50Cu35Al15 and Zr50Cu45Al5 exhibit two nanoscale structure types, one icosahedral and the other more crystal-like. In Zr50Cu35Al15, the poorer glass former, the crystal-like structure is more stable under annealing below the glass transition temperature, Tg, than in Zr50Cu45Al5. Variable resolution fluctuation microscopy of the MRO clusters show that in Zr50Cu35Al15 on sub-Tg annealing, the crystal-like clusters shrink even as they grow more ordered, while icosahedral-like clusters grow. Furthermore, the results suggest that achieving better glass forming ability in this alloy system may depend more on destabilizing crystal-like structures than enhancing non-crystalline structures.},
doi = {10.1016/j.actamat.2016.02.006},
journal = {Acta Materialia},
number = C,
volume = 109,
place = {United States},
year = {Sat Mar 05 00:00:00 EST 2016},
month = {Sat Mar 05 00:00:00 EST 2016}
}

Journal Article:

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Cited by: 58 works
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Figures / Tables:

Table 1 Table 1: The corresponding parameters for five different FEM resolutions.

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Works referencing / citing this record:

Nanometer-scale gradient atomic packing structure surrounding soft spots in metallic glasses
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