Method for preparing alloy material of high niobium-titanium-aluminum by discharging plasma agglomeration
A discharge plasma, titanium-aluminum alloy technology, applied in the field of high-niobium titanium-aluminum intermetallic compound materials, to achieve the effects of uniform composition, fast heating and cooling, and strong experimental repeatability
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Embodiment 1
[0020] Put the pre-synthesized Ti-45Al-8.5Nd-0.2B-0.2W-0.1Y alloy powder (spherical powder technique, average particle size is 30μm, oxygen content is 0.12w.%, carbon content is 0.03w.%) into Φ20 Put the stone mill mold into the spark plasma sintering furnace, vacuumize the system to 2Pa, apply axial pressure of 40MPa, and heat up to the required sintering temperature at a speed of 100℃ / min (1050℃, 1100°C, 1150°C, 1200°C, 1250°C), then keep at this temperature for 5 minutes and then cool with the furnace. After testing, the density of the above prepared samples is 4.29g / m 3 , close to the theoretical density of the material; different types of microstructures can be obtained at different sintering temperatures. The specific experimental results are as follows:
[0021]
[0022] * DP: bimorph tissue; NL: near full-thickness slice; FL: full-thickness slice; σ bc : compressive strength; σ 0.2c : compressive yield strength; ε c :Compression ratio;
Embodiment 2
[0024] Put the pre-synthesized 70w.% Ti-45Al-8.5Nd-0.2B-0.2W-0.1Y alloy powder and 30w.% element mixed powder with the same composition ratio as the alloy powder, mix them evenly and put them into a Φ20 stone mill Put the stone mill mold into the discharge plasma sintering furnace, vacuum the system to 2Pa, apply axial pressure of 40MPa, raise the temperature to 1050℃ at a speed of 100℃ / min, and then keep it at this temperature for 5min. Cool in the furnace. After testing, the density of the sample is 4.29g / m 3 , close to the theoretical density of the material. The mechanical properties of the sample are: the compressive strength is 3010MPa, the compressive yield strength is 1006MPa, and the compressive breaking strain is 42.0%.
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