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Outline
Al-Cu-Mg-Ag alloy sheets prepared at different hot rolling temperatures (450 ℃ and 470 ℃) were annealed at 340, 360, 380 and 400 ℃ respectively. Subsequently, room-temperature tensile tests, fatigue crack growth tests, metallographic microscope, scanning electron microscope (SEM) and X-ray diffraction (XRD) were employed to investigate the effects of hot rolling and annealing processes on the microstructure and mechanical properties of the T4-tempered alloy. The results indicate that temperatures of hot rolling and annealing exert little influence on the room-temperature mechanical properties and fatigue crack growth rate of T4-tempered Al-Cu-Mg-Ag alloy. Hot rolling at elevated temperatures leads to the increase in the amount of static precipitates, which can in turn result in finer recrystallized grains during the subsequent annealing process.
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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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