期刊
JOURNAL OF APPLIED PHYSICS
卷 110, 期 1, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3605510
关键词
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资金
- National Natural Science Foundation of China [50901006, 50871054]
- Research Fund for the Doctoral Program of Higher Education of China [20090006120025, 20093219110035]
- Beijing Nova Program of China [2010B017]
- Program of Introducing Talents of Discipline to Universities [B07003]
We performed molecular dynamics simulations to study the glass formation and local atomic structure of rapidly quenched Al. Both potential energy and structural parameters indicate that the glass transition temperature of amorphous Al is as low as 300 K, which may lead to the poor thermal stability of the amorphous Al as it is prone to crystallize even at room temperature. Voronoi polyhedra analysis reveals that the most popular polyhedron is the deformed body-centered cubic (bcc) cluster characterized by the index < 0, 3, 6, 4 > in the amorphous Al, while the icosahedron with the index < 0, 0, 12, 0 > is always predominant in bulk metallic glass formers with excellent glass forming ability (GFA). Moreover, these deformed-bcc short-range orders can make up medium-range orders via the linkage of vertex-, edge-, face-, intercrossed-shared atoms, which are believed to more easily transform into face-centered cubic (fcc) Al nanocrystal compared with the icosahedral clusters in terms of the symmetrical similarity between bcc and fcc structures. This finding could unveil the structural origin of poor GFA of Al-based alloys. (C) 2011 American Institute of Physics. [doi:10.1063/1.3605510]
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