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

Inactive Publication Date: 2007-05-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, only a few researchers at home and abroad have carried out the research on the preparation of ordinary TiAl-based alloys by SPS technology (B.C.Mei, Y.Miyamoto.Preparation of Ti-Al intermetallic compounds by spark plasmasintering.Metallurgical and Materials Transactions, 2001, 32A(3A): 843-847; K. Matsugi, N. Ishibashi, T. Hatayama et al. Microstructure of spark sintered titanium-aluminide compacts. Intermetallics, 1996, 4: 457-467; M.Umemoto et al.Mechanical properties of nanocrystalline Ti-Al-X alloys. Materials Science And Engineering, 2002, A329-331:196-205; S.J.Hwang, M.S.Kim, S.Y.Jung et al.Consolidation of mechanically milled TiAlalloys by spark plasma sintering.Journal of Metastable and Nanocrystalline Materials, 2003, 15-16: 361-366), but there is no relevant report on the preparation of high Nb-TiAl based alloy materials by SPS technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

This invention discloses a method for preparing high-Nb Ti-Al alloy by discharge plasma sintering. The method comprises: loading element mixed powder alloy powder into a graphite mold, placing in a discharge plasma-sintering furnace, applying an axial pressure of 10-80 MPa, heating at a rate of 50-800 deg.C / min in 10-2-6 Pa vacuum or inert atmosphere, sintering at 900-1400 deg.C, keeping the temperature, and cooling to room temperature to obtain high-Nb Ti-Al alloy blocks. The method can prepare highly compact high-Nb Ti-Al alloy blocks with uniform composition and high performance in a short time and at a low sintering temperature. Besides, the method also has such advantages as low energy consumption, little pollution, easy operation and good repeatability.

Description

technical field [0001] The invention belongs to the technical field of high-niobium titanium-aluminum intermetallic compound materials, and in particular provides a method for preparing high-niobium titanium-aluminum alloy materials by spark plasma sintering. Background technique [0002] Because of its low specific gravity, good high-temperature strength, high stiffness and elastic modulus, and good oxidation resistance, creep resistance and fatigue resistance, TiAl-based alloys are widely used in the fields of aviation, aerospace and automobiles. Very competitive high temperature structural material. However, the biggest obstacle to the practical application of TiAl-based alloys is the low plasticity at room temperature, poor formability and insufficient oxidation resistance above 850 °C. In view of the above problems, it is an important content of future work to research and develop high-temperature TiAl alloys with higher temperatures, and to continuously improve and de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C30/00C22C45/08B22F3/14
Inventor 曲选辉路新何新波王衍航陈国良
Owner UNIV OF SCI & TECH BEIJING
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