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

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 Zr 50Cu 35Al 15 and Zr 50Cu 45Al 5 exhibit two nanoscale structure types, one icosahedral and the other more crystal-like. In Zr 50Cu 35Al 15, the poorer glass former, the crystal-like structure is more stable under annealing below the glass transition temperature, T g, than in Zr 50Cu 45Al 5. Variable resolution fluctuation microscopy of the MRO clusters show that in Zr 50Cu 35Al 15 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.
 [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:
Report Number(s):
Journal ID: ISSN 1359-6454; PII: S1359645416300799
Grant/Contract Number:
DMR1205899; CMMI1232731; DMR1121288; AC02-07CH11358
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 109; Journal Issue: C; Journal ID: ISSN 1359-6454
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; fluctuation electron microscopy; medium range order; metallic glass; glass forming ability; hybrid reverse Monte Carlo
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1357658