The effects of annealing temperatures on mechanical properties, intergranular corrosion resistance and microstructure of an Al-Cu-Mg-Ag alloy sheet were investigated by tensile tests, intergranular corrosion tests, electrochemical measurements, scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results show that with an annealing time of 4 h, the annealing temperature increased from 335 ℃ to 395 ℃ can refine the recrystallized grains of alloy sheet and promote the dissolution of residual second-phase particles, which significantly enhances the mechanical properties of the alloy. Cube texture preferentially develops in specimens annealed at 335 ℃ for 4 h, whereas Goss texture becomes the dominant texture after annealing at 395 ℃ for 4 h. It is found that higher annealing temperatures lead to increased corrosion current density and negative shift of corrosion potential, which accelerates the intergranular corrosion rate and degrades the corrosion resistance of the alloy sheet.
| 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 |