Full
Outline
The effect of solution temperatures，aging temperatures and aging time on the microstructure and mechanical properties of novel high-strength Ti-B25 titanium alloy is investigated by means of optical microscope，scanning electron microscope and electron backscatter diffraction. The results show that the microstructure of Ti-B25 titanium alloy consists of equiaxed primary α phase （αp） and β matrix after solution treatment. As the solution temperature increases，the volume fraction and size of αp phase gradually decrease，accompanied by the simultaneous deterioration of strength and ductility of the alloy. When the solution temperature is 780 ℃ and 800 ℃，with the increase of aging temperature，the secondary α phase （αs） coarsens and decreases in volume fraction，causing a decrease in strength and an increase in ductility. At the solution temperature of 800 ℃ and aging temperature of 600 ℃，with the increase of aging time，the αs phase continuously coarsens，and the volume fraction of αs phase increases firstly and then decreases，resulting in an increase and then a decrease in the strength of the alloy，but little change in the ductility. After solution and aging treatment at 800 ℃/1 h/AC+600 ℃/8 h/AC，the size and volume fraction of αs phase achieve a good balance，and the alloy achieves the best balance between strength and ductility. The tensile strength and yield strength reach 1270 MPa and 1220 MPa，respectively，while the elongation and reduction of area are 15% and 49%. Therefore，the optimal heat treatment scheme of the alloy is determined to be 800 ℃/1 h/AC+600 ℃/8 h/AC. After the optimal heat treatment，the volume fraction and grain orientation of α and β phases in the Ti-B25 titanium alloy microstructure change significantly. The volume fraction of the α phase and the proportion of high angle grain boundaries increase obviously. The α phase texture transforms from T-type texture to B-type texture，〈110〉∥TD and 〈100〉∥AD fiber texture，while the β phase texture changes from cubic texture to〈111〉∥TD fiber texture，and the texture intensity of both phases is 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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