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To improve the internal quality and mechanical properties of magnesium alloy die-casting parts, this paper studies the influence of high and low speed switching position on the internal porosity and mechanical properties of AE44 magnesium alloy die-casting parts. The results show that compared with the traditional position of the punch when the alloy liquid reaches the inner gate as the high and low speed switching position, advancing the high and low speed switching position can reduce the porosity inside the casting and improve its mechanical properties. However, advancing the high and low speed switching position too much can actually increase the porosity and decrease the mechanical properties. That is mainly because advancing the high and low speed switching position can reduce the melt temperature drop of magnesium alloy during the filling process, which is beneficial for improving the fluidity of magnesium alloy and the discharge of residual air in the mold cavity. If the high and low speed switching position is advanced too much, it will increase the turbulence level when the melt fills the mold cavity, entrain more gas, and improve the porosity of the casting.
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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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