TiAl base alloy synergetically strengthened and toughened by carbides and titanium alloy layers, and preparation method thereof

A carbide and titanium alloy technology, applied in the field of metal materials, can solve problems such as limited improvement effect of TiAl-based alloys

Active Publication Date: 2017-12-01
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the improvement effect of the above-mentioned several kinds of ceramic particles on TiAl-based alloys is limited, and the "inversion" relationship between the strength and plasticity of TiAl-based alloys is still a prominent problem. Maintaining or even increasing toughness while maintaining strength has become a major scientific issue of widespread concern at home and abroad.

Method used

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  • TiAl base alloy synergetically strengthened and toughened by carbides and titanium alloy layers, and preparation method thereof
  • TiAl base alloy synergetically strengthened and toughened by carbides and titanium alloy layers, and preparation method thereof
  • TiAl base alloy synergetically strengthened and toughened by carbides and titanium alloy layers, and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing a TiAl-based alloy synergistically strengthened and toughened by the carbide and the titanium alloy layer described in the above technical solution, comprising the following steps:

[0035] (1) mixing titanium powder, aluminum powder and TiC powder to obtain a mixed powder;

[0036] (2) Alternately stacking the mixed powder in the step (1) and the titanium alloy thin plate with a through structure layer by layer, and filling the mixed powder into the through structure to obtain a green body;

[0037] (3) Sintering the green body obtained in the step (2) to obtain a TiAl-based alloy synergistically strengthened and toughened by the carbide and the titanium alloy layer.

[0038] The invention mixes titanium powder, aluminum powder and TiC powder to obtain mixed powder. In the present invention, the mass ratio of the titanium powder, aluminum powder and TiC powder is preferably (52.58~61.81):(29.64~34.83):(3.36~17...

Embodiment 1

[0053] (1) if figure 1 As shown, the TC4 titanium alloy (Ti-6Al-4V) sheet with a thickness of Φ30mm and a thickness of 0.3mm is opened, the diameter of the hole is 0.5mm, and the distance between the longitudinal and transverse circular holes is 1mm, and then the porous TC4 titanium alloy thin plate is processed into Φ30mm discs by wire cutting, then pickled with 10wt% HF solution to remove the surface oxide film, then washed with distilled water, then rinsed with acetone, and vacuum dried at a vacuum degree of 0.05Pa and a temperature of 30°C 30min;

[0054] (2) Weigh the powder according to 59.77Ti-33.69Al-6.54TiC (wt%), dry mix it with a ball mill for 4 hours, the ratio of ball to material is 4:1, the speed is 500r / min, ball mill for 30min, and pass through a 200-mesh sieve after mixing spare;

[0055] (3) if figure 2 As shown, the processed titanium alloy thin plate and 59.77Ti-33.69Al-6.54TiC (wt%) mixed powder are stacked layer by layer in the graphite mold, the numb...

Embodiment 2

[0061] (1) The TC4 titanium alloy (Ti-6Al-4V) thin plate with a thickness of 0.3mm is perforated, the diameter of the hole is 0.5mm, and the distance between the longitudinal and transverse circular holes and the circular holes is 1mm, and then the porous TC4 titanium The alloy thin plate is processed into Φ30mm discs by wire cutting, and then pickled with 10wt% HF solution to remove the surface oxide film, then washed with distilled water, then rinsed with acetone, and vacuum-dried at a vacuum degree of 0.05Pa and a temperature of 40°C for 30min;

[0062] (2) Weigh the powder according to 59.77Ti-33.69Al-6.54TiC (wt%), dry mix it with a ball mill for 4 hours, the ratio of ball to material is 4:1, the speed is 500r / min, ball mill for 30min, and pass through a 200-mesh sieve after mixing spare;

[0063] (3) The processed titanium alloy sheet and 59.77Ti-33.69Al-6.54TiC (wt%) mixed powder are stacked layer by layer in a graphite mold, the titanium alloy layer is 5 layers, and th...

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Abstract

The invention provides a TiAl base alloy synergetically strengthened and toughened by carbides and titanium alloy layers, and a preparation method thereof. The TiAl base alloy synergetically strengthened and toughened by the carbides and the titanium alloy layers, provided by the invention, comprises carbide-TiAl alloy layers and titanium alloy layers alternately stacked and arranged; each titanium alloy layer is internally provided with a through structure of which two openings are located on the upper and lower surface of the titanium alloy layer separately, and the through structure is filled with carbide-TiAl alloy; the carbide-TiAl alloy layers at two adjacent sides of the titanium alloy layer are connected through the carbide-TiAl alloy in the through structure; the carbide-TiAl alloy layers and the titanium alloy layer as well as the carbide-TiAl alloy and the titanium alloy in the through structure are connected though Ti3Al interface layers; carbides in the carbide-TiAl alloy layers and the carbide-TiAl alloy comprise Ti2AlC and Ti3AlC2.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a TiAl-based alloy synergistically strengthened and toughened by a carbide and a titanium alloy layer and a preparation method thereof. Background technique [0002] Titanium-aluminum intermetallic compounds coexist with metal bonds and covalent bonds, and have excellent properties of metals and ceramics. They can replace high-temperature alloys such as high-density nickel-based and cobalt-based alloys, and make certain aerospace structural parts and ground power systems that rotate or reciprocate. It is a new type of light-weight and high-temperature-resistant structural material with important application prospects in aerospace, automotive and other fields. However, the most prominent problem of TiAl-based alloys is the intrinsic brittleness at room temperature, which makes it difficult to process and deform, which greatly limits its application fields. [0003] After ...

Claims

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Application Information

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IPC IPC(8): B22F7/02
CPCB22F7/02B22F2999/00B22F2207/20
Inventor 艾桃桃费岩晗刘芳袁新强董洪峰李文虎王维
Owner SHAANXI SCI TECH UNIV
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