期刊
PHYSICAL REVIEW B
卷 87, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.184203
关键词
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资金
- National Science Fundation (NSF) [DMR-1207141]
- NSF [DMR-1106293, DMR-08-56199, DMR-12-06707]
- NASA [NNX07AK27G, NNX10AU19G]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1207141, 1106293, 1206707] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0856199] Funding Source: National Science Foundation
We report on and characterize, via molecular dynamics studies, the evolution of the structure of Cu50Zr50 and Cu64Zr36 metallic glasses (MGs) as temperature is varied. Interestingly, a percolating icosahedral network appears in the Cu64Zr36 system as it is supercooled. This leads us to introduce a static length scale, which grows dramatically as this three-dimensional system approaches the glass transition. Amidst interpenetrating connections, noninterpenetrating connections between icosahedra are shown to become prevalent upon supercooling and to greatly enhance the connectivity of the MG's icosahedral network. Additionally, we characterize the chemical compositions of the icosahedral networks and their components. These findings demonstrate the importance of noninterpenetrating connections for facilitating extensive structural networks in Cu-Zr MGs, which in turn drive dynamical slowing in these materials.
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