Preparation method of nano silicon carbide particle reinforced aluminum alloy-based composite material

A nano-silicon carbide and aluminum alloy-based technology, applied in metal rolling and other directions, can solve the problems of many process links and high cost, and achieve the effects of uniform dispersion, reduction of process links and costs, and excellent toughness and toughness.

Active Publication Date: 2021-08-31

WUHAN UNIV

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AI-Extracted Technical Summary

Problems solved by technology

Obviously, the traditional preparation process requir...

Abstract

The invention relates to the field of preparation of metal-based composite materials, and particularly discloses a preparation method of a nano silicon carbide particle reinforced aluminum alloy-based composite material. The method comprises the following steps of clamping nano silicon carbide particles, alloy element powder or sheets among a plurality of aluminum plates, performing rolling at room temperature, performing folding in the rolling direction after rolling, and repeating the rolling-folding process for multiple passes; and heating and rolling a rolled sample repeatedly to obtain the finally completely-densified block aluminum alloy-based composite material. In the multi-pass rolling process, under the action of severe plastic deformation, alloy elements are gradually dissolved and enter an aluminum matrix, the solid alloying effect is achieved, and an aluminum alloy matrix is formed; and meanwhile, the silicon carbide particles are also uniformly dispersed in the aluminum alloy matrix. Equipment required by the method is an industrial rolling mill and a muffle furnace, the process is simple, all elements in the obtained composite material are subjected to solid solution, the nano particles are uniformly dispersed, crystal grains are fine, and the strength and toughness are excellent.

Application Domain

Metal rolling arrangements

Technology Topic

Muffle furnaceAlloy element +14

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Examples

Experimental program(3)

Example Embodiment

[0037] Example 1 A manufacturing method of silicon carbide particles nano-aluminum alloy matrix reinforced composites, comprising the steps of:

[0038] Composite material prepared in the present embodiment to alloy Al-4.5wt% Mg as the base, the mass fraction is 10% SiC reinforcement. Wherein the particle size of SiC particles is 50nm.

[0039] (1) cut out 125 × 50 × 0.25mm aluminum sheet size, take 8 polished and clean as the original matrix, and the sample surface;

[0040] (2) The quality of the aluminum sheet, weighed and accounted for 4.5% of the mass percentage of magnesium, and 10% of the nano SiC particles. The two particles are placed in a beaker, to which was poured an appropriate amount of ethanol, and ultrasonic vibration, until the two kinds of particles uniformly mixed to give a suspension.

[0041] (3) The aluminum sheet surface in step (2) uniformly coating the entire suspension obtained in step (2), until complete evaporation of ethanol, the suspension of 8-coated aluminum sheets stacked together to obtain a laminated billet.

[0042] (4) The step (3) after the stack of blanks obtained steel sheet for wrapping at room temperature (25 ℃, hereinafter the same) for rolling after each rolling pass are folded aluminum sheet in the rolling direction, and then rolled steel sheet after wrapping. Then repeated fold - required to pass rolling step, rolling embodiment of the present embodiment at room temperature 70 times, reduction of the thickness of the sample after each pass rolling ≥50%, to give the intermediate material.

[0043] (5) densification temperature: the step (4) to give the intermediate materials for high temperature rolling process: the intermediate material is placed in a muffle furnace of 400 three-minute incubation deg.] C, holding time taken out immediately after hot rolling thin, then deg.] C and then placed in a muffle furnace at 400 C for 3 minutes, and repeat the above insulation - total rolling step four times, the thickness direction of the cumulative reduction of> 70%. After completion of the final rolling is immediately placed into a quenching water, ensure that the cooling speed of 400K / s or more, to obtain a final Al-Mg / SiC composites.

[0044]figure 2 (A) - (b) of the present embodiment SEM image of the final sample in Example 1, it can be seen, the dispersibility of the nanoparticles is very good. figure 2 (C) - (f) SEM elemental mapping of Example 1 composite material prepared in the present embodiment, it can be seen, all of the alloy elements uniformly dispersed in the aluminum matrix, indicating that all of the alloying elements dissolved in the aluminum matrix.

[0045] Tensile strength of the composite material prepared by the process according to the present embodiment up to 580MPa, elongation at break of 7%, with excellent toughness properties.

Example Embodiment

[0046] Example 2

[0047] Composite material prepared in the present embodiment to alloy Al-10wt% Mg as the base, 6wt% SiC as reinforcement. Wherein the particle size of SiC particles is 50nm.

[0048] (1) cut out 125 × 50 × 0.25mm aluminum sheet size, take 8 polished and clean as the original matrix, and the sample surface.

[0049] (2) The quality of the aluminum sheet, weighed and accounted for 10% mass percentage of magnesium powder and 6% of nano SiC particles. The two particles are placed in a beaker (or similar container), into the amount of absolute ethanol and ultrasonic vibration. Uniformly mixed to give two particle suspension by ultrasonic oscillation. The suspension was uniformly coated aluminum sheet surface in step (1), until complete evaporation of ethanol, the number of sheets of an aluminum sheet coated with the suspension are stacked together to obtain a laminated billet.

[0050] (3) Step (2) wrapped stack of blanks in the steel sheets was subjected to a rolling deformation, after each pass rolling are folded aluminum sheet in the rolling direction, and then rolled. Repeat fold - until the desired rolling passes, which passes ≧ 70, the rolling reduction per pass sample thickness ≥50%, to give the intermediate material.

[0051] Intermediate material (3) obtained in (4) in step 400 in a muffle furnace deg.] C incubation for 3 minutes, taken out and then immediately hot rolling thin, repeated heat - rolling cycle three times, the cumulative amount of reduction in the thickness direction > 70%. Finally, a secondary quenching treatment after rolling is completed immediately, ensure that the cooling speed of 400K / s or more, to obtain the final Al-Mg / SiC composites.

[0052] image 3 (A) - (b) SEM image of the final sample in Example 2 of the present embodiment, it can be seen, the dispersibility of the nanoparticles is very good. image 3 (C) - (f) SEM elemental maps Example 2 composite material prepared in the present embodiment, it can be seen from the figure, all alloying elements are uniformly dispersed in the aluminum matrix, indicating that all of the alloying elements dissolved in the aluminum matrix.

[0053] Tensile strength of the composite material prepared by the process according to the present embodiment up to 430MPa, elongation at break of 4%, having good mechanical properties.

Example Embodiment

[0054] Example 3

[0055] Composite material prepared in the present embodiment to Al-5.6% Zn-2.5% Mg-1.5Cu (wt%) alloy as the matrix, 12wt% SiC as reinforcement. Wherein the particle size of SiC particles is 50nm.

[0056] (1) cut out 125 × 50 × 0.25mm aluminum sheet size, take 8 polished and clean as the original matrix, and the sample surface.

[0057] (2) The quality of the aluminum sheet, weighed mass of its percentage of 5.6%, 2.5%, 1.5% zinc, magnesium, copper, and 12% of the nano SiC particles. These powders were placed in a beaker (or similar container), into the amount of absolute ethanol and ultrasonic vibration. Mixed particles obtained by ultrasonic vibration of the suspension, the suspension was uniformly coated aluminum sheet surface in step (1), to be completely volatilized ethanol, the copper surface is placed directly on an aluminum sheet, the number of sheets suspension coated with copper aluminum sheet stacked together to obtain a laminated billet.

[0058] (3) Step (2) wrapped stack of blanks in the steel sheets was subjected to a rolling deformation, after each pass rolling are folded aluminum sheet in the rolling direction, and then rolled. Repeat fold - until the desired rolling passes, which passes ≧ 70, the rolling reduction per pass sample thickness ≥50%, to give the intermediate material.

[0059] Intermediate material (3) obtained in (4) in the step 500 ℃ muffle furnace incubated for 5 minutes, then immediately taken out hot rolling thin, repeated heat - rolling cycle three times, the cumulative amount of reduction in the thickness direction > 70%. Finally, a secondary quenching treatment after rolling is completed immediately, ensure that the cooling speed of 400K / s or more, i.e., a solid solution state aluminum alloy matrix composites.

[0060] Aluminum matrix composites in solid solution state (4) obtained in (5) step in a muffle furnace at 120 deg.] C temperature for 12h aging treatment, obtained after processing the final Al-Zn-Mg-Cu / SiC composites .

[0061] Figure 4 (A) - (b) SEM image of the final sample in Example 3 of the present embodiment can be seen that the dispersibility of the nanoparticles is very good. Figure 4 (C) - (h) Example SEM image of the final sample distribution element 3 in the present embodiment, it can be seen all of the alloy elements uniformly dispersed in the aluminum matrix, indicating that all of the alloying elements dissolved in the aluminum matrix.

[0062] Tensile strength of the composite material prepared by the process according to the present embodiment is 650 MPa or high, elongation at break of 8.5%, with excellent toughness properties.

PUM

Property	Measurement	Unit
Particle size	50.0	nm
Tensile strength	580.0	mPa
Tensile strength	430.0	mPa

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

evenly dispersed

Preparation method of nano silicon carbide particle reinforced aluminum alloy-based composite material

A nano-silicon carbide and aluminum alloy-based technology, applied in metal rolling and other directions, can solve the problems of many process links and high cost, and achieve the effects of uniform dispersion, reduction of process links and costs, and excellent toughness and toughness.

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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