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This paper analyzes the effects of Sr elements and different heat treatment states on the microstructure, eutectic silicon morphology, mechanical properties, and fracture mode of Al-Si-Mg alloy. The paper also proposes a way to improve the plasticity of Al Si Mg cast alloys by regulating the morphology of eutectic silicon and reducing the number and sizes of hard and brittle phases such as Al (Fe, Mn) Si. The results show that, after Sr modification, the straight sheet eutectic silicon is transformed into fine feather shaped eutectic silicon, the elongation of the aluminum alloy increases by 137% compared to unmodified, while the alloy strength doesn’t improve significantly. After heat treatment, eutectic silicon undergoes melting and spheroidization, changing the fracture mode and mechanical properties of the aluminum alloy. After artificial aging and solid solution treatment, the yield strength and the elongation of the aluminum alloy increase by 73% and 97% respectively compared to the cast state. The quenching temperatures have a significant impact on the mechanical properties of the 2# alloy by T6 treated. When the quenching temperature is 530 ℃, after artificial aging treatment, the tensile and yield strength of the aluminum alloy are increased by 14% and 100% respectively compared to the cast state, and the elongation remains unchanged, demonstrating superior comprehensive mechanical properties.
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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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