High-toughness ultrafine-grain composite titanium alloy and application and preparation method thereof

A composite structure and titanium alloy technology, which is applied in the field of high-strength and toughness ultra-fine grain composite structure titanium alloy and its preparation, can solve the problem that there is no research report on high-strength and tough ultra-fine grain composite structure titanium alloy, narrow composition range and limited cooling rate. and other problems, to achieve the effect of saving raw materials, simple processing and convenient operation.

Active Publication Date: 2014-12-24
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
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Problems solved by technology

However, this method also has two defects: one is that the five-component component is easy to form an intermetallic compound, which offsets the strengthening effect of dendrites and deteriorates the ductility of the material, thereby forming a nanocrystalline matrix/amorphous matrix + ductile β- The composition range of the Ti dendrite structure is relatively narrow; the second is that the cooling rate is l

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  • High-toughness ultrafine-grain composite titanium alloy and application and preparation method thereof
  • High-toughness ultrafine-grain composite titanium alloy and application and preparation method thereof

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Example Embodiment

[0039] Example 1

[0040] The titanium alloy with high strength and toughness and ultrafine grain composite structure of the present embodiment is prepared from the following mass percentage components: Ti 58.70%, Nb 22.44%, Fe 8.33%, Co 7.45%, and Al 3.15%.

[0041] The specific operation steps of the above-mentioned preparation method of high-strength and ultra-fine-crystalline titanium alloy with composite structure are as follows:

[0042] (1) Mixed powder

[0043] Mix elemental powders with mass percentages of Ti 58.70%, Nb 22.44%, Fe 8.33%, Co 7.45%, Al 3.15% in a powder mixer, and the average particle size of each elementary powder is 75 μm;

[0044] (2) High-energy ball milling to prepare amorphous alloy powder

[0045] Put the uniformly mixed powder in a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling media such as the tank body and the grinding ball materials are all stainless steel. The diameters of the grinding balls are 15mm, 10mm and 6mm, respe...

Example Embodiment

[0055] Example 2

[0056] The titanium alloy with a high-strength and ultra-fine-grain composite structure of this embodiment is prepared from the following mass percentage components: Ti 55%, Nb 15%, Fe 16%, Co 12%, Al 2%.

[0057] The specific operation steps of the method for preparing the above-mentioned high-strength and ultra-fine-crystalline titanium alloy with composite structure are as follows:

[0058] (1) Mixed powder

[0059] Mix elemental powders with mass percentages of Ti 55%, Nb 15%, Fe 16%, Co 12%, Al 2% in a powder mixer, and the average particle size of each elementary powder is 75 μm;

[0060] (2) High-energy ball milling to prepare amorphous alloy powder

[0061] Put the uniformly mixed powder in a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling media such as the tank body and the grinding ball materials are all stainless steel. The diameters of the grinding balls are 15mm, 10mm and 6mm, respectively. The weight of the three types of gri...

Example Embodiment

[0071] Example 3

[0072] The titanium alloy with a high-strength and ultra-fine-grain composite structure of this embodiment is prepared from the following mass percentage components: Ti 62%, Nb 24%, Fe 6%, Co 2%, Al 6%.

[0073] The specific operation steps of the above-mentioned preparation method of high-strength and ultra-fine-crystalline titanium alloy with composite structure are as follows:

[0074] (1) Mixed powder

[0075] Mix elemental powders with mass percentages of Ti 62%, Nb 24%, Fe 6%, Co 2%, Al 6% in a powder mixer, and the average particle size of each elementary powder is 75 μm;

[0076] (2) High-energy ball milling to prepare amorphous alloy powder

[0077] Put the uniformly mixed powder into a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling media such as the tank body and the grinding ball materials are all stainless steel. The diameters of the grinding balls are 15mm, 10mm and 6mm, respectively. The weight of the three types of grinding...

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Abstract

The invention belongs to the technical field of alloy materials, and particularly relates to high-toughness ultrafine-grain composite titanium alloy and application and preparation method thereof. The high-toughness ultrafine-grain composite titanium alloy consists of the following elements in percentage by mass: 55-62% of Ti, 15-24% of Nb, 6-16% of Fe, 2-12% of Co and 2-6% of Al, wherein a microstructure thereof takes a body centered cubic disordered solid solution phase rich in Ti and Nb as a matrix phase and takes a second isometric crystal phase rich in Ti and Co as a reinforcing phase. The preparation method of the high-toughness ultrafine-grain composite titanium alloy comprises the following steps: mixing powder of the elementary substances according to the percentages by mass, performing ball milling at high energy to prepare amorphous alloy powder and sintering to obtain the high-toughness ultrafine-grain composite titanium alloy. The high-toughness ultrafine-grain composite titanium alloy prepared by the preparation method has the advantages of large size and good comprehensive mechanical properties, and can be applied to the field of aerospace materials.

Description

technical field [0001] The invention belongs to the technical field of ultrafine-grained alloy materials, and in particular relates to a high-strength and tough ultrafine-grained composite structure titanium alloy, a preparation method and application thereof. Background technique [0002] Titanium alloy has excellent comprehensive properties such as low density, high specific strength and fracture toughness, good low temperature toughness and corrosion resistance, and has been widely used in chemical industry, shipbuilding, medical treatment, energy and other fields, but as an important engineering structure It has become an eternal goal pursued by researchers to prepare titanium alloys with higher specific strength and toughness to meet the application under harsher conditions. [0003] At present, researchers have obtained a series of composite structure titanium alloys with nanocrystalline matrix / amorphous matrix + ductile β-Ti dendrite structure through copper mold cast...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/04
Inventor 杨超刘乐华丁智屈盛官李小强张卫文李元元
Owner SOUTH CHINA UNIV OF TECH
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