Gamma-group Ti-Al alloy material with high-temperature resistance oxidation and manufacture method thereof

A high-temperature oxidation resistance, titanium-aluminum alloy technology, applied in the field of γ-based titanium-aluminum alloy materials and their preparation

Inactive Publication Date: 2008-08-20
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the manufacture of γTiAl-based alloys with high temperature oxidation resistance by mechanical alloying and spark plasma sintering

Method used

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  • Gamma-group Ti-Al alloy material with high-temperature resistance oxidation and manufacture method thereof
  • Gamma-group Ti-Al alloy material with high-temperature resistance oxidation and manufacture method thereof
  • Gamma-group Ti-Al alloy material with high-temperature resistance oxidation and manufacture method thereof

Examples

Experimental program
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Effect test

example 1

[0050] Example 1: The mechanical alloying method is adopted, that is, the mixed powder including nano-scale grains, amorphous state and part of TiAl intermetallic compounds is first obtained by high-energy ball milling. TiH 2 , Al, Si and Nb powders are subjected to high-energy mechanical ball milling. Under the condition of great plastic deformation, cold welding and crushing occur continuously. With the extension of ball milling time, the powder particle size gradually becomes smaller and the particle size is more uniform. see Figure 1a It can be seen that after ball milling for 5 hours, most of the powder particles still maintain the original powder form, and the average particle size is 40 μm to 50 μm. With the extension of the ball milling time, when the ball milling is up to 30h (see Figure 1b ), the particle size of the powder was significantly refined, most of the powder particle size was uniform, but some powders were agglomerated. During the 35h ball milling, du...

example 2

[0051] Example 2: see Figure 2a It can be seen that the powder particles of the ball milled for 35h become thinner and smaller during the continuous welding and crushing process, and a lamellar structure is formed after ball milling (refer to the arrow in the figure). During ball milling, powder particles of the same composition and powder particles of different compositions are welded under the action of strong extrusion, impact, etc., thus forming a "sandwich" structure of lamellae. The diffraction spot analysis result is the diffraction pattern of Ti2Al phase, Ti2Al is a metastable phase, indicating that a metastable phase is formed during the ball milling process, and a variety of metastable phases can be formed between Ti and Al, but no other metastable phases were found in this experiment. phase appears. Figure 2b It is the powder morphology image and diffraction spot photo of ball milling for 40h. It can be seen from the figure that the powder particles are very smal...

example 3

[0052] Example 3: Referring to Figure 3(a), it can be seen that after 5 hours of ball milling, most of the powder particles still maintain the original powder form, and the average particle size is 40-50 μm. When the ball milling time increases to 40 hours (see Figure 3 (b)), The powder particles are obviously fined. The effect of powder ball milling is very obvious. The average size of the observed powder particle clusters is 0.8 μm.

[0053] Refer to 3(c): After 35 hours of high-energy ball milling, there are many fine grains of about 10 nm on the powder particle film. The diffraction spots are analyzed as TiAl and Ti3Al discontinuous polycrystalline thin film rings, and the appearance of TiAl and Ti3Al discontinuous polycrystalline rings. It shows that the powder particles are very small at this time, and nanocrystals are formed.

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Abstract

The invention relates to a Gamma-based titanium-aluminum alloy material with high temperature oxidation resistance and a manufacturing method thereof, which aims at overcoming shortages of Gamma titanium-aluminum alloy produced by the conventional technique such as casting, forging and vacuum sintering, etc. The components of the Gamma-based titanium-aluminum alloy material are: 39.8-49.8 percent of Ti (at), 45-48 percent of Al (at), 0.2-0.3 percent of Si (at) and 5-12 percent of Nb (at). To produce the Gamma-based titanium-aluminum alloy material with high temperature oxidation resistance, the mechanical alloying is adopted, namely, mixed powder comprising nano-crystals, amorphous materials and part of TiAl intermetallic compound are fist obtained by high energy ball milling, and then spark plasma sintering is done to the ball-milled mixed powder so as to obtain the Gamma-based titanium-aluminum alloy with high performance in a short sintering time. The Gamma-based titanium-aluminum alloy material prepared by the invention has the advantages of fine TiAl based alloy structure, uniform compositions, high density and excellent high temperature oxidation resistance.

Description

technical field [0001] The invention relates to a γ-based titanium-aluminum alloy material with high temperature oxidation resistance and a preparation method thereof. Background technique [0002] γTiAl-based alloy has the advantages of low specific gravity and high creep resistance. As a new type of lightweight superalloy, it has attracted more and more attention from the scientific and industrial circles in various countries. Compared with traditional titanium alloys and nickel-based superalloys, it has There are obvious advantages in performance. As aerospace materials, it has become a hot topic in worldwide research. At present, the operating temperature of the developed high-temperature titanium alloys can reach 500-600 °C, and the expected operating temperature of γTiAl-based alloys is higher, although the high-temperature oxidation properties of γ-TiAl-based alloys are higher than that of ordinary titanium alloys and high-temperature stainless steels However, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/05B22F9/04B22F3/14
Inventor 陈华刘利萍王柏树贾素秋
Owner CHANGCHUN UNIV OF TECH
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