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Title: Composition-dependent stability of the medium-range order responsible for metallic glass formation

Journal Article · · Acta Materialia
 [1];  [1];  [2];  [1];  [1];  [3];  [1];  [1];  [1]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States); Univ. of Science and Technology, Hefei (Republic of China)
  3. Ames Lab., Ames, IA (United States)

The competition between the characteristic medium-range order corresponding to amorphous alloys and that in ordered crystalline phases is central to phase selection and morphology evolution under various processing conditions. We examine the stability of a model glass system, Cu–Zr, by comparing the energetics of various medium-range structural motifs over a wide range of compositions using first-principles calculations. Furthermore, we focus specifically on motifs that represent possible building blocks for competing glassy and crystalline phases, and we employ a genetic algorithm to efficiently identify the energetically favored decorations of each motif for specific compositions. These results show that a Bergman-type motif with crystallization-resisting icosahedral symmetry is energetically most favorable in the composition range 0.63 < xCu < 0.68, and is the underlying motif for one of the three optimal glass-forming ranges observed experimentally for this binary system (Li et al., 2008). This work establishes an energy-based methodology to evaluate specific medium-range structural motifs which compete with stable crystalline nuclei in deeply undercooled liquids.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1239834
Alternate ID(s):
OSTI ID: 1556277
Report Number(s):
IS-J 8912; PII: S1359645414006521
Journal Information:
Acta Materialia, Vol. 81, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (9)

Nanometer-scale gradient atomic packing structure surrounding soft spots in metallic glasses journal July 2018
Classical interaction potentials for diverse materials from ab initio data: a review of potfit journal September 2015
Development of a semi-empirical potential suitable for molecular dynamics simulation of vitrification in Cu-Zr alloys journal December 2019
Development of Bulk Metallic Glass Matrix Composites (BMGMC) by Additive Manufacturing: Modelling and Simulation – A Review: Part A journal June 2019
Cooling rate dependence of structural order in Ni 62 Nb 38 metallic glass journal January 2018
Structural hierarchy as a key to complex phase selection in Al-Sm journal October 2017
Development of Bulk Metallic Glass Matrix Composites (BMGMC) by Additive Manufacturing: Modelling and Simulation – A Review: Part B journal June 2019
Classical interaction potentials for diverse materials from ab initio data: a review of potfit text January 2014
Size effect on atomic structure in low-dimensional Cu-Zr amorphous systems journal August 2017