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Multi-scale and double-state structure titanium alloy based on eutectic transformation, preparation and application

A dual-state structure and eutectic transformation technology, applied in the field of alloy processing, can solve the problems of coarse grains, complicated preparation procedures, and difficulty in obtaining ultra-fine grains, and achieve the effect of improving fracture strength and fracture strain.

Inactive Publication Date: 2016-01-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the necessary semi-solid slurry or blank preparation process in the existing semi-solid processing technology is relatively complicated, and it is difficult to prepare semi-solid slurry of high melting point metal alloys, which greatly limits the technical potential of semi-solid processing technology. , which restricts the application range of alloy systems related to this technology. In addition, the microstructure grains of the alloy materials prepared by the existing semi-solid processing technology are very coarse (usually more than tens of microns), and it is difficult to obtain ultra-fine crystals or nanocrystals. The fine-grained microstructure makes it impossible to prepare double-scale or multi-scale structures

Method used

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  • Multi-scale and double-state structure titanium alloy based on eutectic transformation, preparation and application
  • Multi-scale and double-state structure titanium alloy based on eutectic transformation, preparation and application
  • Multi-scale and double-state structure titanium alloy based on eutectic transformation, preparation and application

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Embodiment 1

[0037] (1) Powder mixing: According to the material design principle that the alloy system has multiple crystalline phases, and two phases can preferentially undergo eutectic transformation, the designed alloy system is Ti 52.5 Nb 12.2 Fe 21.5 co 8 Al 5.8 (atomic percent), which includes bccβ-Ti, bccTiFe, and fccCoTi 2 and other three crystalline phases, among which bccβ-Ti and bccTiFe can preferentially undergo eutectic transformation to form a liquid phase, and the elemental powders of Ti, Nb, Fe, Co and Al elements with a particle size of 75 μm prepared by atomization method are calculated by atomic percentage For ingredients, mix the elemental powders in a mixer until they are evenly mixed.

[0038] (2) Preparation of alloy powder by high-energy ball milling: Place the uniformly mixed alloy powder in a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling medium such as the tank body and ball material of the ball mill are all stainless steel, an...

Embodiment 2

[0046] (1) Powder mixing: According to the material design principle that the alloy system has multiple crystalline phases, and two phases can preferentially undergo eutectic transformation, the designed alloy system is Ti 62 Nb 14.1 Fe 5.5 co 11.7 Al 6.7 (atomic percent), which includes bccβ-Ti, bccTiFe, and fccCoTi 2 and other three crystalline phases, among which bccβ-Ti and bccTiFe can preferentially undergo eutectic transformation to form a liquid phase, and the elemental powders of Ti, Nb, Fe, Co and Al elements with a particle size of 150 μm prepared by atomization method are calculated by atomic percentage For ingredients, mix the elemental powders in a mixer until they are evenly mixed.

[0047] (2) Preparation of alloy powder by high-energy ball milling: Place the uniformly mixed alloy powder in a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling medium such as the tank body and ball material of the ball mill are all stainless steel, a...

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Abstract

The invention belongs to the technical field of alloy machining and discloses a multi-scale and double-state structure titanium alloy based on eutectic transformation, preparation and application. The alloy is prepared from, by atomic percent, 52.5-62% of Ti, 10.0-14.1% of Nb, 5.5-21.5% of Fe, 8-16.3% of Co and 5.8-6.7% of Al. The microstructure of the multi-scale and double-state structure titanium alloy comprises a lamellar-type eutectic structure base body of nanocrystalline and ultra-fine grains, and an isometric crystal second phase of the micron size. A preparing method includes the three steps of powder mixing, alloy powder preparing through high-energy ball grinding and semi-solid sintering of alloy powder. The sintering temperature is controlled to be between the beginning temperature of eutectic transformation and the melting beginning time, so that the obtained alloy has the nanometer and superfine-scale lamellar-type eutectic structure and an isometric crystal coexisting multi-scale and double-state structure of the micron size, and the performance of the alloy is more superior.

Description

technical field [0001] The invention belongs to the technical field of alloy processing, and specifically relates to a multi-scale two-state structure titanium alloy based on eutectic transformation and its preparation and application. Background technique [0002] As a new type of advanced lightweight metal structure material, titanium alloy has excellent properties such as low density, high strength, high plasticity and high fracture toughness, good corrosion resistance and biocompatibility, and is widely used in aviation, aerospace, Machinery, national defense equipment, chemical industry, shipbuilding, medical treatment, energy and other fields. However, as an important engineering structural material, the rapid development of modern industry has continuously increased the requirements for the service temperature and strength of titanium alloy materials. The application under harsh conditions has always been the goal pursued by researchers. The topic of "Lightweight an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22C1/04
Inventor 杨超康利梅李鑫鑫屈盛官李小强张卫文
Owner SOUTH CHINA UNIV OF TECH
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