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Method for preparing TiAl-based alloy sheet

A technology of base alloy and composite plate, which is applied in the field of preparation of TiAl base alloy plate, can solve the problems of poor processing deformation, difficult forming and processing, easy introduction of impurities, etc., and achieves low cost, long mixing time and cost reduction effect

Inactive Publication Date: 2011-02-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high cost and easy introduction of impurities in the existing method for preparing TiAl-based alloys from elemental powders, and the poor cold deformability of existing TiAl-based alloys leading to difficult forming and processing problems. The present invention provides a TiAl-based alloy plate. Preparation

Method used

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specific Embodiment approach 1

[0015] Specific embodiment 1: The preparation method of the TiAl-based alloy plate in this embodiment is realized through the following steps: 1. Add 50% to 55% TiH 2 Al powder and 45%~50% Al powder carry out mechanical powder mixing 9~30h to obtain mixed powder, wherein the mass ratio of ball to material is 5~10: 1, and the purity of described Al powder is not less than 99% (mass); Two, Put the mixed powder prepared in step 1 into a graphite mold, then put the graphite mold into a vacuum hot-press sintering furnace, evacuate to 0.1-0.001MPa, then raise the temperature to 500-680°C, keep it warm for 60-120min, and then add Press to 10-30MPa, then hold the pressure and keep warm for 60-120min to obtain Ti-Al bimetallic composite; 3. Roll the Ti-Al bimetallic composite obtained in step 2 at room temperature to 200°C to obtain Ti-Al Al bimetallic composite sheet; 4. Put the Ti-Al bimetallic composite sheet obtained in step 3 into a vacuum hot-pressing sintering furnace, heat up t...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, 52% TiH 2 Powder and 48% Al powder were mechanically mixed for 24 hours to obtain mixed powder. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0019] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that TiH in step one 2 The particle size of the powder is 30-50 μm, and the particle size of the Al powder is 20-40 μm. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a method for preparing a TiAl-based alloy sheet, and solves the problems that: the conventional method for preparing the TiAl-based alloy from elemental powder has high cost and impurities are easy to introduce; and the conventional TiAl-based alloy is difficult to mold and process due to poor deformability during cold processing. The method comprises the following steps of: mechanically mixing TiH2 powder and pure Al powder; filling the mixed powder into a graphite die; then carrying out hot pressing sintering to obtain a Ti-Al duplex metal compound; rolling and molding the Ti-Al duplex metal compound to obtain a Ti-Al duplex metal composite sheet; and carrying out hot pressing reactive sintering on the Ti-Al duplex metal composite sheet to synthesize the TiAl-based alloy sheet. The preparation method has low cost and is simple; and cheap TiH2 powder is taken as the raw material. The TiH2 powder is fragile powder, the cold welding is difficult to generate in the powder mixing process and the required powder mixing time is short so as to reduce the introduction of the impurities. The method adopts the elemental powder process of molding first and then producing the alloy, overcomes the defect of poor deformability of the fragile TiAl alloy during the cold processing and can sufficiently meet various molding requirements.

Description

technical field [0001] The invention relates to a preparation method of a TiAl-based alloy plate. Background technique [0002] Due to its light weight, high strength, outstanding creep resistance and oxidation resistance, TiAl-based alloys have become very competitive materials for heat-resistant structural parts in aerospace, aviation and automobiles. At present, with the development of the practical process of TiAl-based alloys, the requirements for preparing TiAl-based alloy sheets are becoming more and more urgent. However, TiAl-based alloys have very low plasticity and poor processability, so the preparation of TiAl-based alloy sheets is very difficult. [0003] At present, the forming process of TiAl-based alloy sheet mainly includes casting metallurgy process (such as extrusion, forging, rolling, sheet forming), alloy powder forming process and element powder synthesis process. The casting metallurgical process directly rolls the TiAl alloy ingot, which requires hi...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22F1/18C22C14/00
Inventor 李爱滨杜小米李峰范国华耿林朱开南
Owner HARBIN INST OF TECH
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