Preparation method of 6061 aluminum alloy by adding nano-reduced graphene oxide / alumina particles to obtain aluminum alloy composite material
By adding nanoreduced graphene oxide/alumina particles to the 6061 aluminum alloy and adopting an improved preparation process, the shortcomings in strength and elastic modulus of traditional aluminum alloys are solved, and the mechanical properties of aluminum-based composite materials are significantly improved.
Patent Information
- Application Number
- CN202210038345.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-01-13
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2042-01-13
AI Technical Summary
Traditional aluminum alloys are difficult to meet the modern society's demand for improving material performance in terms of strength and elastic modulus.
The aluminum-based composite material was prepared by adding nanoreduced graphene oxide/alumina (RGO/Al2O3) particles to the 6061 aluminum alloy and using the improved Hummers method. The aluminum-based composite material was prepared by combining high-energy ball milling and pre-pressing forming process.
The strength and other mechanical properties of aluminum-based composite materials have been significantly improved, meeting the demand for improving material properties.
Smart Images
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Abstract
Description
[0001] The invention belongs to the technical field of aluminum alloy and nano material synthesis, and particularly relates to a preparation method for obtaining an aluminum alloy composite material by adding nano-reduced graphene oxide / aluminum oxide particles to a 6061 aluminum alloy. Background technology:
[0002] Aluminum alloy has the advantages of low density, good mechanical properties, high thermal conductivity, good corrosion resistance, etc. It is a key structural material in the aerospace and transportation fields. However, with the increasing requirements of modern society for material performance, especially the improvement of strength and elastic modulus, traditional aluminum alloys are gradually unable to keep up with the demand. As a new type of engineering material, aluminum-based composite materials have received more and more attention in recent years. Aluminum-based composite materials inherit the excellent properties of aluminum alloys and the advantages of introducing reinforcing materials. Summary of the invention:
[0003] The purpose of the present invention is to prepare an aluminum-based composite material using 6061 aluminum alloy as a matrix material by adding nano-reduced graphene oxide / alumina (RGO / Al2O3) particles to improve its mechanical properties such as strength.
[0004] Firstly, graphene oxide (GO) was prepared using a modified Hummers method.
[0005] 70 ml of deionized water was added to a beaker, and then 5 mmol of glucose was added, and the mixture was stirred in the beaker for 10 min. Then 10 mmol of AlCl3·6H2O and 10 mmol of NaAlO2 were added to the beaker and stirred for 30 min. 0.54 g of graphene oxide (GO) was added to 30 ml of deionized water and uniformly dispersed and stirred. Then the mixture was transferred to a 100 ml steel autoclave and kept at 150 ° C for 12 h. After cooling to room temperature, a brown solid was obtained, which was washed several times with deionized water and anhydrous ethanol, and finally dried in an oven at 60 ° C. The dried product was put into a grinding mortar for grinding, and the ground powder was put into a tubular sintering furnace with argon gas. The sintering process was as follows: the temperature was raised to 300 ° C after 180 min, and the mixture was kept at 300 ° C for 10 min. After 180 min, the temperature was raised to 550 ° C, and the mixture was sintered at 550 ° C for 4 h, and then cooled to room temperature with the furnace.
[0006] The prepared nano-reduced graphene oxide / alumina (RGO / Al2O3) particles were added into a 6061 aluminum alloy matrix at different mass ratios (0.1, 0.3, 0.5wt%); then high-energy ball milling was performed with a ball mill speed of 200 rpm, a ball milling time of 10 h, and a ball-to-material ratio of 5:1.
[0007] The prepared uniformly dispersed aluminum-based composite material powder is placed in a cold pressing mold and pre-pressed at 5MPa, 20MPa, and 30MPa in sequence, with each pre-pressing being maintained for 5 minutes; then the prepared pre-pressed aluminum alloy block is placed in the mold, heated to 500°C, and kept warm for 50 minutes, and then extruded at a certain extrusion ratio to obtain an aluminum-based composite material rod. Specific implementation method:
[0008] The technical solution of the present invention is clearly and completely described below through embodiments in conjunction with the accompanying drawings.
[0009] Example 1: Graphene oxide (GO) was prepared by the improved Hummers method, and then 70 ml of deionized water was added to a beaker, and then 5 mmol of glucose was added and stirred in the beaker for 10 min, and then 10 mmol of AlCl3·6H2O and 10 mmol of NaAlO2 were put into the beaker and stirred for 30 min; 0.54 g of graphene oxide (GO) was added to 30 ml of deionized water and evenly dispersed and stirred, and then the above mixture was transferred to a 100 ml steel autoclave and kept at 150°C for 12 h. After cooling to room temperature, a brown solid was obtained, which was washed several times with deionized water and anhydrous ethanol, and finally dried in an oven at 60°C; the dried product was placed in a grinding mortar for grinding, and the ground powder was placed in a tubular sintering furnace with argon gas. The sintering process was as follows: the temperature was raised to 300°C after 180 minutes, and sintered at 300°C for 10 minutes, and then raised to 550°C after 180 minutes, and sintered at 550°C for 4 hours, and then cooled to room temperature with the furnace.
[0010] Example 2: The nano-reduced graphene oxide / alumina (RGO / Al2O3) particles prepared in Example 1 were added to a 6061 aluminum alloy matrix in different mass ratios (0.1, 0.3, 0.5wt%) to prepare an aluminum-based composite material powder; the mixture was mixed using a high-energy ball mill with a ball mill speed of 200 rpm, a ball milling time of 10 h, a ball-to-material ratio of 5:1, a total mass of grinding balls of various diameters (10, 8, 4 mm) of 500 g, and a total mass of powder of 100 g.
[0011] Example 3: The uniformly dispersed aluminum-based composite material powder prepared in Example 2 was placed in a cold pressing mold, and pre-pressed at 5 MPa, 20 MPa, and 30 MPa in sequence, with each pre-pressing being maintained for 5 minutes.
[0012] Example 4: The pre-pressed aluminum alloy block prepared in Example 3 is placed in a mold, heated to 500° C., and kept warm for 50 minutes, and then extruded at a certain extrusion ratio to obtain an aluminum-based composite material rod.
[0013] Example 5: The aluminum-based composite material bar prepared in Example 4 was subjected to a density test; then a hardness test; and a tensile test was performed on the prepared tensile specimen using a universal mechanical testing machine.
[0014] Example 6: The aluminum-based composite material rod prepared in Example 4 was smoothed on the test surface by water grinding, and then mirror-polished with a P-1 type metallographic sample polishing agent. The microscopic morphology was first observed using a scanning electron microscope and the EDS energy spectrum was tested; the port morphology of the sample after the tensile test was scanned. Description of the drawings:
[0015] Figure 1 This is a SEM image of the nano-reduced graphene oxide / alumina particles prepared in the present invention.
[0016] Figure 2 This is the transverse SEM microstructure of the aluminum-based composite material prepared in the present invention.
[0017] Figure 3 The SEM microstructure of the fracture morphology of the aluminum-based composite material tensile specimen prepared in the present invention.
[0018] Figure 4 This is the XRD analysis result of the aluminum-based composite material prepared in the present invention.
[0019] Figure 5 The Vickers hardness curve of the aluminum-based composite material prepared in the present invention.
[0020] Figure 6 This is the true stress-strain curve of the tensile test of the aluminum-based composite material prepared by the present invention.
[0021] Figure 7 This is a bar graph of the tensile strength and yield strength of the aluminum-based composite material prepared in the present invention.
Claims
A method for preparing an aluminum alloy composite material by adding nano-reduced graphene oxide / alumina particles to 1.6061 aluminum alloy, characterized in that The method comprises the following steps: ① preparing nano reduced graphene oxide / aluminum oxide (RGO / Al2O3) particles, ② mixing the nano reduced graphene oxide / aluminum oxide (RGO / Al2O3) particles prepared in ① with 6061 aluminum alloy powder in a certain proportion, and ball milling the mixture with a high-energy ball mill, ③ pre-pressing the mixed powder in ② in sequence with different pressures, ④ placing the aluminum alloy block pre-pressed in ③ in a mold, heating it to a certain temperature, keeping it warm for a period of time, and then extruding it at a certain extrusion ratio, and ⑤ preparing samples of the extruded aluminum alloy rods and performing mechanical property tests and microstructure characterization; Nano-reduced graphene oxide / alumina (RGO / Al2O3) particles are 0.1% to 0.5% of the mass of 6061 aluminum alloy powder; The heating temperature is 500°C and the holding time is 50 min.
2. The method for preparing an aluminum alloy composite material by adding nano-reduced graphene oxide / alumina particles to the 6061 aluminum alloy according to claim 1, characterized in that: In step ①, graphene oxide is prepared by an improved Hummers method, and nano-reduced graphene oxide / alumina (RGO / Al2O3) particles are prepared by a hydrothermal method.
3. The method for preparing an aluminum alloy composite material by adding nano-reduced graphene oxide / alumina particles to the 6061 aluminum alloy according to claim 1, characterized in that: In step ②, the ball-to-material ratio is 5:1, and the ball milling time after mixing is 10 hours.
4. The method for preparing an aluminum alloy composite material by adding nano-reduced graphene oxide / alumina particles to the 6061 aluminum alloy according to claim 1, characterized in that: In step ③, the pre-pressing molding pressures are 5, 20, and 30 MPa, respectively, and the holding time is 5 min.
5. The method for preparing an aluminum alloy composite material by adding nano-reduced graphene oxide / alumina particles to the 6061 aluminum alloy according to claim 1, characterized in that: In step ⑤, the aluminum alloy bar is subjected to mechanical property tests such as hardness and tensile strength and microstructural characterization such as SEM and tensile fracture morphology.