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Method for reinforced 7075 aluminum alloy rolled sheets

A technology of aluminum alloy and aluminum alloy melt, applied in the field of strengthening 7075 aluminum alloy rolling sheet, can solve the problems of reducing fracture toughness, melt stress concentration, etc. Effect

Inactive Publication Date: 2019-04-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For nano / micro ceramic particles, micron-sized ceramic particles usually have high nucleation efficiency, but it is easy to cause stress concentration around the melt, which reduces its fracture toughness.

Method used

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  • Method for reinforced 7075 aluminum alloy rolled sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] A kind of method of strengthening 7075 aluminum alloy rolled plate of this example is as follows:

[0137] Step 1, in situ reaction to prepare the aluminum alloy strengthening agent, specifically as follows:

[0138] (1) Preparation of Al-Ti-B 4 C-BN system reaction compact

[0139] (a) Weigh B at a molar ratio of 1:1 4 C powder and BN powder are ready for use. B 4 The particle size of C powder is 6.5 μm, and the purity is ≥92.0wt.%; the particle size of BN powder is 0.5 μm, and the purity is ≥99.0wt.%. 4 C and BN powders were activated by planetary ball mill at a speed of 200r / min for 3h.

[0140] (b) expected in Al-Ti-B 4 TiCN-AlN-TiB obtained in C-BN system 2 The mass fraction of ceramic particles is 40wt.%; in the reaction system Ti:B 4 The molar ratio of C:BN is 9:2.8:2.8; weigh Al powder, Ti powder, activated B 4 C powder and BN powder are ready for use. The particle size of the aluminum powder is 48 μm, and the purity is ≥99.9wt.%; the particle size of ...

Embodiment 2

[0170] A kind of method of strengthening 7075 aluminum alloy rolled plate of this example is as follows:

[0171] Step 1, in situ reaction to prepare the aluminum alloy strengthening agent, specifically as follows:

[0172] (1) Preparation of Al-Ti-B 4 C-BN system reaction compact

[0173] (a) Weigh B at a molar ratio of 1:1 4 C powder and BN powder are ready for use. B 4 The particle size of C powder is 2.6 μm, and the purity is ≥92.0wt.%; the particle size of BN powder is 1.3 μm, and the purity is ≥99.0wt.%. 4 C and BN powders were activated by planetary ball mill at a speed of 250r / min for 2h.

[0174] (b) expected in Al-Ti-B 4 TiCN-AlN-TiB obtained in C-BN system 2 The mass fraction of ceramic particles is 30wt.%; in the reaction system Ti:B 4 The molar ratio of C:BN is 9:2.8:2.8; weigh Al powder, Ti powder, activated B 4 C powder and BN powder are ready for use. The particle size of the aluminum powder is 38 μm, and the purity is ≥99.9wt.%; the particle size of ...

Embodiment 3

[0204] A kind of method of strengthening 7075 aluminum alloy rolled plate of this example is as follows:

[0205] Step 1, in situ reaction to prepare the aluminum alloy strengthening agent, specifically as follows:

[0206] (1) Preparation of Al-Ti-B 4 C-BN system reaction compact

[0207] (a) Weigh B at a molar ratio of 1:1 4 C powder and BN powder are ready for use. B 4 The particle size of C powder is 6.5 μm, and the purity is ≥92.0wt.%; the particle size of BN powder is 0.5 μm, and the purity is ≥99.0wt.%. 4 C and BN powders were activated by planetary ball mill at a speed of 250r / min for 2h.

[0208] (b) expected in Al-Ti-B 4 TiCN-AlN-TiB obtained in C-BN system 2 The mass fraction of ceramic particles is 30wt.%; in the reaction system Ti:B 4 The molar ratio of C:BN is 9:2.4:2.4; weigh Al powder, Ti powder, activated B 4 C powder and BN powder are ready for use. The particle size of the aluminum powder is 25 μm, and the purity is ≥99.9wt.%; the particle size of ...

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Abstract

The invention discloses a method for reinforced 7075 aluminum alloy rolled sheets. The method comprises the following steps that 1, an aluminum alloy enhancer which contains multi-phase multi-scale TiCN-AlN-TiB2 ceramic particles is prepared by in-situ reaction; 2, the aluminum alloy enhancer is added into 7075 aluminum alloy melt to prepare the multi-phase multi-scale particle reinforced 7075 aluminum alloy; and 3, the multi-phase multi-scale particle reinforced 7075 aluminum alloy is subjected to rolling and heat treatment to obtain the reinforced 7075 aluminum alloy rolled sheets. Accordingto the method, the addition amount of the aluminum alloy enhancer with the multi-phase multi-scale TiCN-AlN-TiB2 ceramic particles is added and controlled, so that the 7075 aluminum alloy rolled sheets are enhanced, and the mechanical property of the 7075 aluminum alloy rolled sheets is improved.

Description

technical field [0001] The invention relates to the fields of aluminum alloys and their processing and preparation, in particular to a method for strengthening 7075 aluminum alloy rolled plates. Background technique [0002] 7 series aluminum alloys, that is, Al-Zn-Mg-Cu alloys, 7075 series alloys have been widely used in the field of aircraft manufacturing since the 1940s. After decades of development, they are still widely used in the fields of automobiles and aerospace. , is an ultra-high strength wrought aluminum alloy. However, usually the mechanical properties of 7075 aluminum alloy are low when it is exposed to high temperature for a long time, so we consider adding a new type of aluminum alloy strengthening agent to increase the comprehensive performance of 7075 alloy. Ceramic particles containing transition metal elements, as a material with high specific strength, high hardness, corrosion resistance, high electrical conductivity and thermal conductivity, when adde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C21/10C22F1/053
CPCC22C1/1036C22C21/10C22F1/002C22F1/053C22C1/1047
Inventor 邱丰刘栓刘天舒姜启川
Owner JILIN UNIV
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