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Outline
The sound velocities of longitudinal wave and transverse wave for LY12Al were measured under static pressures using “pulse echo overlap technique”. According to the bulk modulus at zero pressure, KS0, and its pressure derivative K′S0 yielded from the ultrasonic meansurements under very low pressures (<0.5 GPa), three Isothermal Equations of State—Murnaghan EOS, Birch-Murnaghan EOS and Vinet EOS for LY12Al were reduced. It was found that the Vinet EOS deduced from ultrasonic data was adequate for describing the compressibility of aluminium and its alloy with fcc structure, even up to 200 GPa. Furthermore, the zero pressure Debye temperature and thermodynamic Grüneisen parameter calculated from the ultrasonic data for LY12Al are 430.97 K and 2.025, respectively.
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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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