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Ultra-high-strength and ultra-fine-grain TiB2 reinforced Al-Zn-Mg-Cu composite material and preparation method thereof

A composite material and ultra-fine grain technology, applied in the field of composite materials, can solve the problems of alloy loss, difficulty in further improving tensile strength, alloy stress corrosion cracking, etc., and achieve strength improvement, optimization of rapid solidification process and hot extrusion process Effect

Inactive Publication Date: 2020-08-07
WEIHAI WANFENG MAGNESIUM IND DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high value of Zn / Mg, the stress corrosion cracking of the alloy is serious, and the tensile strength of the alloy is difficult to be further improved after the Zn content of the alloy is increased to 11%.
The addition of endogenous particles can significantly improve the strength of the alloy. The synthesis system is mainly based on stirring addition and in-situ synthesis. At present, there are few studies on the preparation of composite materials using ultra-high-strength Al-Zn-Mg-Cu alloys as the matrix. , and SiC with large particle size and not tightly combined with the matrix interface is used as the reinforcing particles. The reinforcing particles prepared in situ are directly carried out in the ultra-high-strength aluminum alloy solution, which will inevitably cause certain damage to the main component elements in the alloy. Loss

Method used

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  • Ultra-high-strength and ultra-fine-grain TiB2 reinforced Al-Zn-Mg-Cu composite material and preparation method thereof
  • Ultra-high-strength and ultra-fine-grain TiB2 reinforced Al-Zn-Mg-Cu composite material and preparation method thereof
  • Ultra-high-strength and ultra-fine-grain TiB2 reinforced Al-Zn-Mg-Cu composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] Preparation of ultra-high-strength, ultra-fine-grained TiB 2 / Al-Zn-Mg-Cu composite material process is as follows:

[0023] (1) The ratio of the composite material is: 5% TiB 2 , 10% Zn, 1.7% Mg, 1.0% Cu, 0.12% Zr, and the balance is Al. Al-TiB 2 The master alloy consists of high-purity aluminum ingot, Al powder, Ti powder, TiO 2 、H 3 BO 3 Prepare, wherein the molar ratio of Ti / B is 1:3.5, Al powder, Ti powder and TiO 2 The mass ratio of Al-Zn-Mg-Cu-Zr is 2:2:3, and the Al-Zn-Mg-Cu-Zr matrix is ​​prepared from pure aluminum ingots, pure zinc ingots, pure magnesium ingots, Al-50% Cu and Al-4% Zr master alloys.

[0024] (2) Preparation of Al-TiB 2 Master alloy, weigh TiO as required 2 、H 3 BO 3 , mix the two powders evenly, and heat at 200°C for 2h to remove H 3 BO 3 moisture in. The heated TiO 2 and H 3 BO 3 The mixed powder is uniformly mixed with the aluminum powder and titanium powder required to be weighed, and the uniformly mixed powder is placed i...

Embodiment 2

[0030] (1) The ratio of composite materials is: 2% TiB 2 , 11% Zn, 2.0% Mg, 1.2% Cu, 0.12% Zr, and the balance is Al. Al-TiB 2 The master alloy consists of high-purity aluminum ingot, Al powder, Ti powder, TiO 2 、H 3 BO 3 Prepare, wherein the molar ratio of Ti / B is 1:3.5, Al powder, Ti powder and TiO 2 The mass ratio is 2:2:3, and the aluminum ingot is 2Kg. The Al-Zn-Mg-Cu-Zr matrix is ​​prepared from pure aluminum ingots, pure zinc ingots, pure magnesium ingots, Al-50% Cu and Al-4% Zr master alloys.

[0031] (2) Preparation of Al-TiB 2 Master alloy, same as step (2) in embodiment 1.

[0032] (3) The matrix components designed in step (1) are mixed with pure aluminum ingots, pure zinc ingots, pure magnesium ingots, Al-50% Cu and Al-4% Zr master alloys.

[0033] (4) is the same as step (4) in Example 1.

[0034] (5) is the same as step (5) in Example 1.

[0035] (6) T6 heat treatment (solid solution 460°C / 2h, aging 120°C / 24h) on the composite material after hot extrus...

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Abstract

The invention discloses an ultra-high-strength and ultra-fine-grain TiB2 reinforced Al-Zn-Mg-Cu composite material and a preparation method thereof, and belongs to the field of composite materials. The ultra-high-strength and ultra-fine grain TiB2 reinforced Al-Zn-Mg-Cu composite material is characterized in that an Al-Zn-Mg-Cu-Zr alloy is used as a matrix, TiB2 with the average size less than 1 micron is used as reinforcing particles, and the composite material comprises the following components of, in percentage by mass, 8%-12% of Zn, 1.0%-2.0% of Mg, 1.0%-1.5% of Cu, 0.05%-0.15% of Zr, 1%-5% of TiB2 and the balance Al. A two-step method is adopted to prepare the composite material, the mass fraction of the TiB2 particles is adjusted, and crystal grains are refined through a rapid solidification process, so that the matrix forms a large solid solution state, and the structure is more uniform.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to composition design and process optimization of an aluminum-based composite material. Background technique [0002] Al-Zn-Mg-Cu series alloys are a kind of 7xxx series aluminum alloys, also known as ultra-high-strength aluminum alloys. Based on its low density, high specific strength and hardness, easy processing and forming, good corrosion resistance and high toughness, it is an important lightweight structural material in the aerospace and military industries. Modern aircraft and lightweight tanks are developing towards higher speed, more load, and higher trafficability, and the service life and driving safety are becoming more and more important, which requires the materials used to have higher strength and better fatigue resistance Excellent comprehensive properties such as performance and wear resistance. [0003] Since the birth of the 7075 alloy in 1943, Al-Zn-Mg-Cu alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C32/00C22C1/03C22C1/05C22F1/053B22D11/06
CPCC22C21/10C22C32/0073C22C1/03C22C1/026C22C1/058C22F1/053B22D11/0611
Inventor 陈子勇申高亮朱训明王云峰刘旦相志磊任伟敏马小昭
Owner WEIHAI WANFENG MAGNESIUM IND DEV
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