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Shock-induced phase transformation (body-centered cubic α phase to hexagonal close-packed ε phase) in single crystal iron has been investigated by means of molecular dynamics (MD) simulations using an embedded atom method (EAM) potential. The simulated dimension is 28.7 nm×22.9 nm×22.9 nm in size with 1.28×106 atoms. The shock wave is generated by using a piston impact on the sample along the [100] direction. By analyzing the motion history of atoms under shock compression, the phase transformation mechanism has been outlined. The simulation results show that the phase transformation mechanism contains two steps: the atoms on the {011} planes are compressed along the 〈100〉 direction to form a hexagon in the first step, and then the atoms on {011} planes in the 〈0-11〉 direction are slipped to create the hcp structure in the second step. The results also show that the slip planes are only the (011) and (0-11) planes which are parallel with the shock wave propagation.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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