Ab initio molecular dynamics simulation of the surface composition of Co54Ta11B35 metallic glasses

作者：Zhang, Xin; Li, Ran; Zhang, Tao^*

来源：Journal of Non-Crystalline Solids, 2015, 425: 199-206.

DOI：10.1016/j.jnoncrysol.2015.04.013

• Ab-initio molecular dynamics
• Bulk metallic glass
• Pair correlation function
• Bond pairs
• Voronoi tessellation analysis
• Density of states

The ab-initio molecular dynamics simulations were conducted to etude the microscopic atomic and electronic structures of Co54Ta11B35 bulk metallic glasses in the surface composition. The structure properties such as partial pair correlation function, bond pairs and Voronoi tessellation analysis were analyzed. Then the atomic charge and the density of states are also characterized. The degree of local ordering for B is illustrated to decrease in the surface. A liquid-phase B-center cluster was found to increase during annealing. The Co-center distorted icosahedron cluster transformed to the perfect one which could be a signature of surface crystallization. But this crystallization did not change the electronic structure of Co54Ta11B35 alloy obviously.

• 出版日期2015-10-1
• 单位北京航空航天大学