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The conventional solidification structure of cast pure aluminum is coarse. Applying an ultrasonic field and adding grain refiners during the solidification process can refine the grain size, thereby improving the comprehensive properties of the alloy. This paper studies the effects of the combined treatment of Al-5Ti-1B refiner and ultrasonic field on the solidification process and solidification structure of pure aluminum. The experimental results show that the combined treatment of the ultrasonic field and the refiner can achieve a better grain refinement effect than when they act alone. As the ultrasonic power increases, the grain size gradually decreases, and the number of defects such as cavities and porosity shrinkage also significantly decreases. Ultrasonic field can promote the uniform distribution of heterogeneous phase and alloying elements in the aluminum melt from the refiner, increasing the number of effective heterogeneous nuclei of α-Al. The best combined refinement effect is obtained when the ultrasonic power is 1 000 W. Finally, the combined action mechanism of ultrasonic field and the refiner is discussed, and its microscopic action atomic model is given.
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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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