Simulation study of microscopic bubbles in amorphous alloy Co81.5B18.5
Simulation of the diffirsion mechanism via microscopic bubbles in amorphous materials is carried out using the statistical relaxation models Cos.5Bft.5 containing 2 x 105 atoms. The present work is focused on the role of these bubbles for self-diffirsion in amorphous solids. It was found that the nu...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
H. : ĐHQGHN
2017
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| Subjects: | |
| Online Access: | http://repository.vnu.edu.vn/handle/VNU_123/56703 |
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| Institution: | Vietnam National University, Hanoi |
| Language: | English |
| Summary: | Simulation of the diffirsion mechanism via microscopic bubbles in amorphous materials is carried out using the statistical relaxation models Cos.5Bft.5 containing 2 x 105 atoms. The present work is focused on the role of these bubbles for self-diffirsion in amorphous solids. It was found that the numbers'of the vacancy bubbles in amorphous Cog1."B1g ,b vary from 1.4 x 10-3 to 4 x 10-3 per atom depending on the relaxation degree. The simulation shows the collective character of the atomic movement upon diffirsion atoms moving. Due to the large size in comparison with B atom, the jump of a Co diffirses atom leads to a significant local rearrangement of the atoms located near the VB. Meanwhile, B diffuses like the movement of an interstitial impurity through the boron-VB. Diffirsion coeffrcients have been calculated via the vacancy bubbles and they are consistent with experimental data. The effect of the relaxation is also investigated and interpreted as a result of vacancy-bubble annihilation during thermal annealing. |
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