Ultrafine grained Ta material and preparation method thereof

An ultra-fine grain and tantalum material technology, applied in the field of ultra-fine grain Ta material and its preparation, can solve the problems of unsuitable for industrial production of ultra-fine grain high-purity tantalum strip, affecting the performance of Ta material, introducing impurities, etc. Slip suppression, large deformation, and prevention of deformation and cracking

Active Publication Date: 2018-12-28
CENT SOUTH UNIV +1
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  • Abstract
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  • Claims
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Problems solved by technology

[0009] The above technologies can obtain ultra-fine grains of metal materials through the theory of deep plastic deformation. However, the equal-diameter angular extrusion, high-pressure rotation, hourglass extrusion method and wrinkle straightening method are generally only suitable for the processing of small-sized materials. And the process is very complicated, not

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  • Ultrafine grained Ta material and preparation method thereof
  • Ultrafine grained Ta material and preparation method thereof
  • Ultrafine grained Ta material and preparation method thereof

Examples

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Example Embodiment

[0038] Example 1:

[0039] Put the tantalum billet (purity 99.996%) in a vacuum of 10 -4 Electron beam smelting is carried out under Pa conditions (melting temperature is 1310℃). After casting, the ingot is sheathed with high-purity iron in an argon chamber; three-dimensional hot forging is carried out to open the billet, the total deformation of the billet is 75%, and the billet temperature 1200°C. The tantalum ingot after the billet is cleaned from the surface of the high-purity iron sheath, the forged billet is cooled under liquid nitrogen, and after all is cooled thoroughly, it is subjected to ultra-low temperature rolling (the temperature of low temperature cold rolling is -80~-100℃), The deformation of the pass is 50%. The ultra-low temperature cold-rolled 50% tantalum plate is heated to 1100°C, and hot-rolled in the direction perpendicular to the ultra-low-temperature cold-rolling direction (hot rolling temperature is 1100-1120°C), and the rolling deformation is 50%. Rep...

Example Embodiment

[0040] Example 2:

[0041] Put the tantalum ingot (purity 99.997%) in a vacuum of 10 -4 Electron beam melting is carried out under Pa conditions (melting temperature is 1305℃). After ingot casting, the ingot is sheathed with high-purity iron in an argon chamber; three-dimensional hot forging is carried out, the total deformation of the billet is 70%, and the billet temperature 1100°C. The tantalum ingot after the billet is cleaned from the surface of the high-purity iron sheath, the forged billet is cooled under liquid nitrogen, and after all is cooled, it is subjected to ultra-low temperature rolling (the temperature of low temperature cold rolling is -100~-136℃), The deformation of the pass is 50%. The ultra-low temperature cold-rolled 50% tantalum plate is heated to 1100°C, and hot-rolled in the direction perpendicular to the ultra-low-temperature cold-rolling direction (hot rolling temperature is 1100-1120°C), and the rolling deformation is 50%. Repeat steps A and B 6 times...

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Abstract

The invention relates to an ultrafine grained Ta material and a preparation method thereof. Grain size of the ultrafine grained Ta material is smaller than or equal to 3 mu m; ultimate strength of thematerial is higher than or equal to 410 MPa, and yield strength is higher than or equal to 300 MPa. The preparation method of the material comprises the following steps: electron beam melting is performed on a Ta source, after ingot casting, an ingot is sheathed in a protective atmosphere; 3D hot-forging cogging is performed, total deformation of cogging is 65%-75%, and cogging temperature is 1150-1250 DEG C; after cogging, a sheath is removed, and low-temperature and high-temperature cross alternate rolling is performed; the ultrafine grained Ta material is obtained. The process is simple, and the prepared Ta ribbon has uniform and quite fine grains and is endowed with favorable strength, plasticity and toughness. The designed and prepared ultrafine grained Ta ribbon is applied to the high-technology fields of electronics, metallurgy, steel, chemical industry, hard alloys, atomic energy, superconducting technology, automotive electronics, aerospace, medical health and scientific research.

Description

technical field [0001] The invention relates to an ultrafine-crystalline Ta material and a preparation method thereof, belonging to the technical field of design and preparation of special materials. Background technique [0002] The density of tantalum is 16.68g / cm 3 , with a melting point of 2980°C. It has a series of excellent properties such as high melting point, low vapor pressure, good cold working performance, high chemical stability, strong resistance to liquid metal corrosion, and large dielectric constant of the surface oxide film. It is used in electronics, metallurgy, steel, and chemical industry. , Carbide, atomic energy, superconducting technology, automotive electronics, aerospace, medical and health and scientific research and other high-tech fields have important applications. [0003] With the continuous development of the new generation of information technology and industrial technology, in order to meet the needs of deep processing, the grain size and ...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C1/02C22C27/02
CPCC22C1/02C22C27/02C22F1/18
Inventor 李周蒋任翔肖柱彭智龚深张立强邱文婷
Owner CENT SOUTH UNIV
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