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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 limited during the copper mold casting process, which leads to the preparation of these high-strength and ultra-fine-grained composite structure titanium alloys with a size of several millimeters (less than 4 millimeters).
So far, there is no research report on the preparation method of high strength and toughness ultrafine grain composite structure titanium alloy based on the theory of amorphous crystallization

Method used

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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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Embodiment 1

[0040] A high-strength and toughness ultra-fine-grain composite structure titanium alloy of this embodiment is prepared from the following components in mass percentage: Ti 58.70%, Nb 22.44%, Fe 8.33%, Co 7.45%, Al 3.15%.

[0041] The preparation method of the above-mentioned high-strength and tough ultrafine-grain composite structure titanium alloy, the specific operation steps are as follows:

[0042] (1) mixed powder

[0043] Mix the elemental powders with mass percentages of Ti 58.70%, Nb22.44%, Fe 8.33%, Co 7.45%, and Al 3.15% in a powder mixer, wherein the average particle size of each elemental powder is 75 μm;

[0044] (2) Preparation of amorphous alloy powder by high energy ball milling

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

Embodiment 2

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

[0057] The preparation method of the above-mentioned high-strength and tough ultrafine-grain composite structure titanium alloy, the specific operation steps are as follows:

[0058] (1) mixed powder

[0059] Mix the elemental powders with mass percentages of Ti 55%, Nb15%, Fe 16%, Co 12%, and Al 2% in a powder mixer, wherein the average particle size of each elemental powder is 75 μm;

[0060] (2) Preparation of amorphous alloy powder by high energy ball milling

[0061] Put the evenly mixed powder into a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling media such as the tank body and ball materials are all stainless steel, and the diameters of the balls are 15mm, 10mm, and 6mm respectively. The weight of the three balls The ratio is 1:3:...

Embodiment 3

[0072] A high-strength and toughness ultrafine-grain composite structure titanium alloy in this embodiment is prepared from the following components in mass percentage: Ti 62%, Nb 24%, Fe 6%, Co 2%, Al 6%.

[0073] The preparation method of the above-mentioned high-strength and tough ultrafine-grain composite structure titanium alloy, the specific operation steps are as follows:

[0074] (1) mixed powder

[0075] Mix the elemental powders with mass percentages of Ti 62%, Nb24%, Fe 6%, Co 2%, and Al 6% in a powder mixer, wherein the average particle size of each elemental powder is 75 μm;

[0076] (2) Preparation of amorphous alloy powder by high energy ball milling

[0077] Put the evenly mixed powder into a planetary ball mill (QM-2SP20) for high-energy ball milling. The ball milling media such as the tank body and ball materials are all stainless steel, and the diameters of the balls are 15mm, 10mm, and 6mm respectively. The weight of the three balls The ratio is 1:3:1. T...

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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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