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Titanium-aluminum alloy composite material and preparation method thereof

A composite material, titanium-aluminum alloy technology, applied in the field of titanium-based alloys, to achieve the effect of easy operation and low cost

Active Publication Date: 2018-04-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a titanium-aluminum alloy composite material and a preparation method thereof, by designing a reasonable atomic percentage composition: 40-44 at.% for Al, 1-2 at.% for Nb, 1-2 at.% for Fe, 2at.%, V is 1~2at.%, SiC w % and the rest is Ti, in which only a small amount of high-density alloy elements are added, and low-density whiskers are introduced to synergistically strengthen and toughen, and the melting and casting method is adopted to obtain high-strength titanium-aluminum alloy composites in one step. material, the titanium-aluminum alloy composite material has a significantly lower density than the high-Nb titanium-aluminum alloy prepared in the prior art, and has a significantly high specific strength, and also overcomes the prior art method in order to realize the prepared titanium-aluminum alloy The high strength needs to use the powder of raw materials, through ball milling, heating and pressing sintering, high temperature sintering or discharge plasma sintering process, and the casting method also needs to adopt the defect of high cost molding process

Method used

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  • Titanium-aluminum alloy composite material and preparation method thereof

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Embodiment 1

[0025] This embodiment relates to a Ti-Al-Nb-Fe-V-SiC w High-strength titanium-aluminum alloy composite material, the atomic percentage of its composition: Al is 42 at.%, Nb is 1.5 at.%, Fe is 1.5 at.%, V is 1.5 at.%, SiC w is 2.5at.% and the rest is Ti, where SiCw is silicon carbide whisker, and its preparation method is as follows:

[0026] The first step is to prepare raw materials for titanium-aluminum master alloy composite materials:

[0027] According to the atomic percentage of the composition of a titanium-aluminum alloy composite material: Al is 42 at.%, Nb is 1.5 at.%, Fe is 1.5 at.%, V is 1.5 at.%, SiC w 2.5 at.% and the rest is Ti, weigh the corresponding amount of raw materials: commercial pure Ti, commercial pure Al, commercial pure Nb, commercial pure Fe, commercial pure V and commercial β-silicon carbide whiskers to complete the preparation of titanium aluminum mother Raw materials for alloy composite materials;

[0028] The second step is to prepare titani...

Embodiment 2-1

[0034] Except that the commercial pure Ti, commercial pure Al, commercial pure Nb, commercial pure Fe and commercial pure V in the second step are placed in a water-cooled copper crucible, the vacuum degree≤5×10 -2 During the operation of vacuum suspension smelting under the condition of Pa, commercial pure Al, commercial pure Nb, commercial pure Fe and commercial pure V are respectively suspended and placed, that is, in vacuum suspension smelting, after the commercial pure Ti is melted, first Suspended into commercially pure Al, smelted for 3 minutes and reacted uniformly, then suspended into commercially pure Nb, commercially pure Fe and commercially pure V, other than that of Example 1.

Embodiment 2-2

[0036] Except that the commercial pure Ti, commercial pure Al, commercial pure Nb, commercial pure Fe and commercial pure V in the second step are placed in a water-cooled copper crucible, the vacuum degree≤5×10 -2 During the operation of vacuum suspension smelting under the condition of Pa, commercial pure Al, commercial pure Nb, commercial pure Fe and commercial pure V are respectively suspended and placed, that is, in vacuum suspension smelting, after the commercial pure Ti is melted, first Suspended into commercially pure Al, smelted for 3.5 minutes and reacted uniformly, then suspended into commercially pure Nb, commercially pure Fe and commercially pure V, other than that of Example 1.

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Abstract

The invention discloses a titanium-aluminum alloy composite material and a preparation method thereof, and relates to a titanium-based alloy. The titanium-aluminum alloy composite material is a Ti-Al-Nb-Fe-V-SiCw high-strength titanium-aluminum alloy composite material. The titanium-aluminum alloy composite material comprises the components of, by atom, 40-44% of Al, 1-2% of Nb, 1-2% of Fe, 1-2% of V, 2-3% of SiCw and the balance Ti. SiCw is silicon carbide whiskers, only a few high-density alloying elements are added, meanwhile low-density whiskers are introduced to achieve a synergistic effect, strengthening and toughening can be achieved, smelting and pouring modes are adopted, and the high-strength titanium-aluminum alloy composite material can be obtained in a single-pass mode. According to the titanium-aluminum alloy composite material, the density is obviously reduced, high specific strength is achieved, and the defects that as for an existing technological method, powder of rawmaterials needs to be utilized, a ball-milling and hot pressed sintering technology, a high-temperature sintering technology or a spark plasma sintering technology are adopted, and the casting methodneeds to adopt a high-cost forming technology are further overcome.

Description

technical field [0001] The technical solution of the invention relates to a titanium-based alloy, specifically a titanium-aluminum alloy composite material and a preparation method thereof. Background technique [0002] Due to its high specific strength, good high-temperature oxidation resistance and high-temperature creep resistance, titanium-aluminum alloy has become a popular material in the aerospace field in recent decades. Titanium-aluminum alloys also have defects such as poor room temperature plasticity and high-temperature deformation ability. In order to overcome these defects, β-phase stabilizing elements are added to titanium-aluminum alloys, and β-phases with more movable slip systems are introduced, which has become the current TiAl alloy. A basic method of research. [0003] In order to further improve the properties of titanium-aluminum alloys, strengthening and toughening TiAl alloys has become an indispensable research at present. As an excellent β-phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/11C22C49/14C22C47/08C22C101/14
Inventor 崔春翔崔森谢嘉琪刘双进史杰杰
Owner HEBEI UNIV OF TECH