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- W2050081075 abstract "By using first principles molecular dynamics, the correlation between composition, local structure, and dynamics was investigated to reveal the origin of higher glass forming ability in Ta doped Co65B35 amorphous alloy. The types and quantity of dominant polyhedra are quite similar in Co55Ta10B35 and Co65B35 supercooled liquid; however, in the former these polyhedra exhibit larger average lifetime. Further components analysis indicates polyhedra containing Ta atom play a critical role in slowing down the cluster mobility. The relative slower atomic diffusivity in Co55Ta10B35 supercooled liquid indicates Ta addition results in a higher viscosity and difficulty in atomic rearrangement. Moreover, the dominant cluster Co7Ta1B2 in Co55Ta10B35 amorphous alloys has larger combined energy than the dominant cluster Co8B2 in Co65B35 amorphous alloy. Compared with Co, Ta donates more electrons to B, which leads to the strengthening of B–B bond and thus stabilizes the local structure. It is proposed that by enhancing the stability of local structure, Ta addition greatly lowers the cluster mobility, slows down the dynamics, and thus promotes the glass formation." @default.
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- W2050081075 date "2012-10-01" @default.
- W2050081075 modified "2023-10-14" @default.
- W2050081075 title "Local structure origin of higher glass forming ability in Ta doped Co65B35 amorphous alloy" @default.
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- W2050081075 doi "https://doi.org/10.1063/1.4757945" @default.
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