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Outline
The effects of addition of Mn, Ti and Cr on microstructures and properties of Al-Zn-Mg-Cu-Zr alloys were investigated by performing room-temperature tensile test, intergranular corrosion test and electrochemical corrosion test, combined with microstructural characterization techniques such as optical microscopy, scanning electron microscopy and transmission electron microscopy. The results demonstrate that additions of Mn, Ti and Cr can effectively inhibit alloy recrystallization and promote fine and dispersed precipitation of η′ phase. This leads to grain boundary precipitates in a continuous chain-like distribution changed to be discontinuously distributed in a line. Consequently, the yield strength, tensile strength and elongation of the alloys are improved, and the depth of intergranular corrosion and the corrosion current density are reduced; meanwhile the polarization resistance is increased. It is shown that both mechanical properties and corrosion resistance of alloys are significantly enhanced.
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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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