Preparation method of nanometer bimodal isomeric aluminum-magnesium alloy

A kind of aluminum-magnesium alloy and nano-technology, applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc., can solve the problems of large strength difference, complex reaction, high cost, etc., to facilitate post-processing, high repeatability, and high molding rate Effect

Inactive Publication Date: 2019-10-18
NANJING UNIV OF SCI & TECH
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Problems solved by technology

This method is very sensitive to process parameters, and the performance is not easy to repeat; the patent [public number: CN105951132A, public date: 2016.09.21] disclosed "a method of electrochemical deposition preparation of submicron-scale bimodal ultrafine-grained nickel material" solved The technical problem is to provide a submicron bimodal ultrafine nickel material with good matching between strength and plasticity and simple preparation process. This method involves complex chemical and physical processes and high cost; patent [public number: CN106011422A, open Day: 2016.10.12] published "high-strength steel with double-peak scale ferrite structure and its low-cost preparation method" uses ordinary low-carbon steel as raw material plate, through cold deformation + two-phase zone quenching treatment, obtained fine The quasi-polygonal ferrite grains are distributed around the bimodal structure of the coarse polygonal ferrite grains. The

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  • Preparation method of nanometer bimodal isomeric aluminum-magnesium alloy
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  • Preparation method of nanometer bimodal isomeric aluminum-magnesium alloy

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preparation example Construction

[0035] A method for preparing a nanocrystalline / coarse-crystalline bimodal structure Al-Mg alloy, the mass percentage of the material is: 5-7wt% Mg, the rest is Al, and the specific steps are as follows:

[0036] Step 1: Material selection + casting: select the alloy composition, and cast it into a block material; the casting temperature is 680--710°C;

[0037] Step 2: Homogenization: Homogenize the cast alloy bulk material in Step 1 at a temperature range of 300-450° C. for 16-20 hours to prepare a bulk material with more uniform grain size.

[0038] Step 3: Hot deformation: hot rolling the bulk material obtained in step 2 at a temperature of 280-320° C., with a down-rolling rate of 40%-60%, to form a new alloy bulk material. Since defects such as porosity and shrinkage are prone to occur during the casting process, the use of thermal deformation can effectively reduce such defects and make the basic properties of the alloy more stable;

[0039] Step 4: solid solution + quen...

Embodiment 1

[0044] Embodiment 1: Preparation of Al-Mg nano bimodal heterogeneous alloy

[0045] Alloy composition (mass percentage): 5%-Mg, 95%-Al.

[0046] Preparation process: (1) Pure aluminum block (purity 99.9999%) and magnesium block (purity 99.99%) are selected. The aluminum block and the magnesium block are respectively melted to liquid state by using a vacuum melting furnace, and then the molten liquid is injected into the casting mold together, and the two metal liquids are fully fused by electromagnetic stirring, and finally the aluminum-magnesium alloy block is obtained. (2) Homogenize the cast alloy block at a temperature of 350° C. for 20 hours to make the grain size more uniform. (3) Hot-rolled at a temperature of 280-320°C, since defects such as porosity and shrinkage are prone to occur during the casting process, the use of thermal deformation can effectively reduce such defects and make the basic properties of the alloy more stable; (4) in Solid solution at 450°C for 1...

Embodiment 2

[0048] Embodiment 2: Preparation of Al-Mg nano bimodal heterogeneous alloy

[0049] Alloy composition (mass percentage): 7%-Mg, 93%-Al.

[0050] Preparation process: (1) Pure aluminum block (purity 99.9999%) and magnesium block (purity 99.99%) are selected. The aluminum block and the magnesium block are respectively melted to liquid state by using a vacuum melting furnace, and then the molten liquid is injected into the casting mold together, and the two metal liquids are fully fused by electromagnetic stirring, and finally the aluminum-magnesium alloy block is obtained. (2) Homogenize the cast alloy block at a temperature of 350° C. for 20 hours to make the grain size more uniform. (3) Hot-rolled at a temperature of 280-320°C, since defects such as porosity and shrinkage are prone to occur during the casting process, the use of thermal deformation can effectively reduce such defects and make the basic properties of the alloy more stable; (4) in Solid solution at 450°C for 1...

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Abstract

The invention belongs to the field of preparation of metal materials, and particularly relates to a preparation method of a nanometer bimodal isomeric aluminum-magnesium alloy. The preparation methodcomprises the following steps of: firstly carrying out homogenization treatment on a metal block obtained after smelting and casting by using a high-pressure torsion severe plastic deformation method,then carrying out thermal deformation treatment so as to eliminate casting defects, carrying out solution hardening to eliminate the second phase separated out, and preparing a nanocrystalline material with the average grain size of about 80nm by using a coarse-grained aluminum-magnesium alloy sheet, finally using a pulse laser for the fixed point positioning formation of ultrafine crystal/nanocrystalline on the material, and thus, the aluminum-magnesium alloy material with strong plasticity meeting specific requirements can be prepared according to the requirements of a workpiece. A laser temperature-controlled time-controlled point heating technology can be used for controlling the fixed point positioning and quantitative formation of ultrafine crystal/coarse crystals on the basis of anoriginal nanocrystalline substrate. The workpiece can be customized according to the performance requirements of the product, so that the plasticity and strength can be most effectively combined.

Description

technical field [0001] The invention belongs to the field of metal material preparation, in particular to a method for preparing a nano bimodal heterogeneous aluminum-magnesium alloy. Background technique [0002] Aluminum is the most abundant metal on the earth. Aluminum alloy has low density, high specific strength, good plasticity, excellent processing performance, good electrical conductivity, thermal conductivity and corrosion resistance. Magnesium and magnesium alloys are currently the lightest metal structural materials, which have the advantages of low density, high specific strength, high specific stiffness and easy recycling. Among many aluminum alloys, aluminum-magnesium alloys have broad application prospects in many fields due to their high strength / weight ratio, excellent corrosion resistance and weldability. As we all know, the strength and plasticity of metal materials are often not compatible: High strength corresponds to low plasticity, and vice versa, suc...

Claims

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Application Information

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IPC IPC(8): C22F1/047C21D1/09C21D11/00
CPCC22F1/047C21D1/09C21D11/00
Inventor 曹阳浦杰赵永好聂金凤周浩李玉胜毛庆忠
Owner NANJING UNIV OF SCI & TECH
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