Full
Outline
According to the maximum solid solubility of Zn， Mg， Cu in aluminum and their precipitation strengthening phases， Al-12Zn-2Mg-0.5Cu-0.3Sc high strength aluminum alloy is designed. The billet of this alloy is hot rolled followed by clod rolling and heat treatment to explore the optimal heat treatment process for aluminum alloy with high solid solubility to obtain good tensile properties. Optical microscopy （OM）， X-ray diffractometry （XRD） ， and scanning electron microscopy （SEM） are used to observe and analyze the microstructure of the alloy under different heat treatment conditions， and universal tensile testing machine is used to test the tensile properties of the alloy at room temperature. The results show that after solution treatment of 470 ℃/1 h， the microstructure of the cold-rolled alloy is incomplete recrystallized with elongated grains along the rolling direction. The ultimate tensile strength of the alloy is 599 MPa， and the elongation reaches 15.4%. After aging treatment of 120 ℃/30 h， fine η （MgZn2） and T（AlZnMgCu） strengthened phases precipitate in the microstructure， which further improve the properties of the alloy. The corresponding tensile strength reaches 736 MPa， and the elongation is 10.6%.
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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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