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The effects of Sr content on the microstructure, fluidity and mechanical properties of heat-free treatment die-casting aluminum alloy are studied by scanning electron microscopy and electronic tensile testing machine. The results show that with the increase of Sr content, the morphology of eutectic Si phase in die-casting aluminum alloy is refined and modified into fine particles and short bars, the length of the flowing samples of die-casting aluminum alloy liquid increases gradually and the tensile mechanical properties are improved gradually. The optimum Sr content is 0.08% for refining and modification of die-casting aluminum alloy, the length of flowing sample is 879 mm, the tensile strength is 286.2 MPa, and the elongation is 7.9%, the length of flowing sample, tensile strength and elongation of die-casting aluminum alloy are increased by 10.4%, 7.8% and 16.2%, 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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