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The effect of ultrasonic melt treatment (UMT) on the microstructures and hardness of Al-Si-Cu alloy was investigated by Vickers hardness test, optical microscopy, scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy (TEM). The results show that UMT promotes the dispersion of Si phase, reduces the area fraction of secondary phase and refines grains, thereby raising the hardness of Al-Si-Cu alloy. After 2 min UMT, the hardness of T6-tempered Al-Si-Cu alloy sheet increases by 9.2% compared to that of UMT-free sheet. Quantitative TEM analysis indicates that UMT can significantly promote the precipitation of θ' phase and inhibit its rapid coarsening during the aging process, which enhances the hardness and microstructural thermal stability of Al-Si-Cu alloy.
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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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