Using VISAR interferometer and X-ray, phase transition and spalling behavior of FeMnNi alloy under high pressure were studied by symmetric impact and reverse impact experiments. In the loading process, the FeMnNi alloy experienced a α →ε phase transformation, the velocity of the transition was greater than that of the plastic wave, and thus incorporated into a single phase transition wave. In the unloading history, the reverse phase transition also might take place and the rarefaction waves S1 and S2 formed besides the center-rarefaction wave R. The multi-spallation happened for symmetrical and same thickness high pressure in FeMnNi alloy. By analyzing the interaction among the rarefaction waves S1, S2 and the rarefaction R, it was found that the phase transition and reverse transition of the sample are the main causes of multi-spallation.
| 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 |