CN104985393A - Manufacturing method capable of improving mechanical performance of thick 7050-T7451 aluminum alloy plate - Google Patents
Manufacturing method capable of improving mechanical performance of thick 7050-T7451 aluminum alloy plate Download PDFInfo
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- CN104985393A CN104985393A CN201510315469.9A CN201510315469A CN104985393A CN 104985393 A CN104985393 A CN 104985393A CN 201510315469 A CN201510315469 A CN 201510315469A CN 104985393 A CN104985393 A CN 104985393A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Abstract
The invention provides a manufacturing method capable of improving mechanical performance of a thick 7050-T7451 aluminum alloy plate, and belongs to the technical field of metallurgy. The manufacturing method comprises the following technological steps that (1) thermal treatment is conducted; (2) quenching and straightening are conducted; (3) stir friction machining is conducted on the obverse side; and (4) stir friction machining is conducted on the reverse side, so that the thick 7050 aluminum alloy plate with the uniform microstructure and obviously refined crystal grains is obtained. The manufacturing method is a machining mode with the minimum hardness span formed after stir friction machining in the research process at present. Compared with a conventional manufacturing method, the manufacturing method has the advantage that a heat affected zone and a thermo mechanical affected zone of the plate are removed. Compared with a double-side stir friction machining method newly developed in the recent period, the manufacturing method has the advantages that the difference between precipitated phases of an obverse side stir zone and a reverse side stir zone is remarkably reduced, the harness value is remarkably increased, and the span is smaller than or equal to 10 HV. In addition, the hardness of the thick aluminum alloy plate manufactured through the manufacturing method ranges from 130.1 HV to 152.9 HV, the tensile strength of the thick aluminum alloy plate ranges from 466 MPa to 503 MPa, and the elongation of the thick aluminum alloy plate ranges from 30.6% to 31.2%.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of processing method improving 7050-T7451 aluminium alloy thick plate mechanical performance.
Background technology
7050-T7451 (Al-Zn-Mg-Cu) aluminium alloy, also known as high strength alumin ium alloy, have that specific strength is high, high-ductility corrosion, easily shape, cost is low, easy recovery, advantages of environment protection, be widely used in aerospace industry.In decades, the application of Al and Alalloy is subject to the challenge of titanium or titanium alloy and composite, but high-performance aluminium alloy slab does not change substantially as the status of main body load material.
Along with the development of modern science and technology, aircraft of new generation is had higher requirement to material.The part service condition of advanced aircraft is harsh, and complex structure, require integration, many complex components need to adopt superplastic forming technology to manufacture.From the sixties in 20th century, superplastic aluminum alloy just receives domestic and international material supplier author's most attention, comprises the microstructure evolution in superplastic deformation mechanical behavior, deformation process, deformation mechanism, electric pulse and electric field to the superplastic impact of material etc.
Chinese scholars many employings large plastometric set method is prepared super fine crystal material and is reached superplasticity, mixing yoghurt method is a kind of method for Fine Texture of Material modification and manufacture, the method is that processing district material produces severe plastic deformation, mixing, fragmentation and beat exposure under stirring, thus realizes densified, homogenising and the refinement of microstructure.Adopting this technology to prepare crystallite dimension is nano level fine-grained aluminium alloy, and its intensity and plasticity are all greatly improved, so that its energy consumption is low, pollution-free, technique is simple, thinning effect obviously enjoys Chinese scholars parent to look at.But traditional mixing yoghurt method, the impact being subject to the input of mixing plant heat and thermal cycle is large, its adjacent overlap joint stirring area (Stir Zone, SZ) there is the heat engine zone of influence (Thermo Mechanical Affected Zone between, and heat affected area (Heat Affected Zone TMAZ), HAZ), and due to coarse grains and have certain directionality, the existence of the heat engine zone of influence and heat affected area often becomes the weakness zone of superplastic forming process.Two-sided mixing yoghurt method newly developed in the recent period compensate for the defect of traditional mixing yoghurt method preferably, the heat engine zone of influence and heat affected area can be eliminated, structural homogenity is resolved, but the heat input of its reverse side processing makes the precipitated phase increased number of stirring area, front, size is thick, have impact on the uniformity of mechanical property.
Summary of the invention
The object of this invention is to provide a kind of processing method improving 7050-T7451 aluminium alloy thick plate mechanical performance, adopt the inventive method that 7050 aluminium alloy thick plates can be made to eliminate HAZ, TMAZ tissue, positive and negative SZ precipitated phase quantity and size, without significant difference, reach microstructure homogenising; And each stirring area microhardness difference obviously reduces, and plasticity significantly improves, and tensile strength significantly improves.Technical scheme of the present invention is as follows:
Improve a processing method for 7050-T7451 aluminium alloy thick plate mechanical performance, comprise following processing step:
(1) heat-treatment furnace is warming up to 450 ~ 500 DEG C, original for 7050-T7451 aluminium alloy slab is put into heat-treatment furnace heating 2.5 ~ 6h, obtain 7050 aluminum alloy plate materials after heat treatment;
(2) 7050 aluminum alloy plate materials after heat treatment are quenched and align;
(3) carry out front mixing yoghurt, stirring-head central shaft inclination angle is 2.5 °, and stirring-head rotating speed is 500 ~ 700rpm, and process velocity is 80 ~ 120mm/min, and between every time, shaft shoulder amount of lap is 35 ~ 65%, processes 5 passages;
(4) reverse side mixing yoghurt is carried out, wherein process insertion point, mixing needle center distance insertion point, passage mixing needle center, front first skew 30 ~ 55%, stirring-head central shaft inclination angle is 2.5 °, stirring-head rotating speed is 500 ~ 700rpm, process velocity is 80 ~ 120mm/min, between every time, shaft shoulder amount of lap is 35 ~ 65%, processes 4 passages, obtains 7050 aluminium alloy thick plates that mechanical performance is improved.
The 7050 aluminium alloy thick plate microstructures that described mechanical performance is improved are even, the obvious refinement of crystal grain; Hardness is distributed as 130.1 ~ 152.9HV, and tensile strength is 466 ~ 503MPa, and percentage elongation is 30.6 ~ 31.2%.
Beneficial effect of the present invention is as follows:
1. first the inventive method heat-treats the original slab of 7050-T7451 aluminium alloy, the solid solution degree of adjustable 7050 aluminium alloy elements, promotes homogenising degree and the mechanical performance of the rear sheet material Microstructure and properties of processing.
2. the aluminum alloy plate materials after pair heat treatment adopts two-sided mixing yoghurt, can remarkable refinement sheet material microstructure, and can eliminate the heat engine zone of influence and heat affected area that traditional mixing yoghurt produces, improves the plasticity of material.
3. the present invention is the processing mode that in research at present, after mixing yoghurt, hardness span is minimum; Compare with traditional diamond-making technique, the present invention processes between rear adjacent stirring area and eliminates heat affected area, the heat engine zone of influence; Two-sided mixing yoghurt method newly developed is in the recent period compared, the significant difference of positive and negative stirring area precipitated phase reduces, hardness number significantly improves, and span is no more than 10HV, there is no to occur with stirring area width that the convex-concave being the cycle changes, distribute more even, and sheet material tensile strength and plasticity all improve.
4. the aluminium alloy thick plate prepared of the inventive method, crystallite dimension≤10 μm, microstructure is even, the obvious refinement of crystal grain; Hardness is distributed as 130.1 ~ 152.9HV, and tensile strength is 466 ~ 503MPa, and percentage elongation is 30.6 ~ 31.2%.
Accompanying drawing explanation
Fig. 1 is 7050-T7451 aluminium alloy original plate metallographic structure pattern of the present invention;
Fig. 2 is 7050 aluminum alloy plate materials metallographic structure patterns after heat treatment of the present invention;
Fig. 3 is 7050 aluminium alloy thick plate cross-sectional metallographic tissue topographies prepared by the embodiment of the present invention 1;
Fig. 4 is two stirring area metallographic structure patterns adjacent in Fig. 3;
Fig. 5 is front processing stirring area SEM tissue topography in Fig. 3;
Fig. 6 is reverse side processing stirring area SEM tissue topography in Fig. 3;
Fig. 7 is 7050 aluminium alloy thick plate cross-sectional metallographic tissue topographies prepared by the embodiment of the present invention 2;
Fig. 8 is that 7050 aluminium alloy thick plates of the present invention distribute with the hardness of stirring area, two-sided FSP center thickness direction and compare.
Detailed description of the invention
The heat-treatment furnace that the invention process adopts is chamber type electric resistance furnace, and model is SRJX-8-15.
The 7050-T7451 aluminium alloy original plate that the invention process adopts is commercially available prod.
Embodiment 1
(1) heat-treatment furnace is warming up to 450 DEG C, original for 7050-T7451 aluminium alloy slab is put into heat-treatment furnace and heats 6h, obtain 7050 aluminum alloy plate materials after heat treatment;
(2) 7050 aluminum alloy plate materials after heat treatment are quenched and align;
(3) carry out front mixing yoghurt, stirring-head central shaft inclination angle is 2.5 °, and stirring-head rotating speed is 500 ~ 700rpm, and process velocity is 80 ~ 120mm/min, and between every time, shaft shoulder amount of lap is 35 ~ 65%, processes 5 passages;
(4) reverse side mixing yoghurt is carried out, wherein process insertion point, mixing needle center distance insertion point, passage mixing needle center, front first skew 30 ~ 55%, stirring-head central shaft inclination angle is 2.5 °, stirring-head rotating speed is 500 ~ 700rpm, process velocity is 80 ~ 120mm/min, between every time, shaft shoulder amount of lap is 35 ~ 65%, processes 4 passages, obtains 7050 aluminium alloy thick plates that mechanical performance is improved.
Experimental result: performance test is carried out to 7050 aluminium alloy thick plates of the present embodiment, the obvious refinement of crystal grain, microstructure is even, the precipitated phase quantity of positive and negative stirring area and size uniform, hardness is distributed as 130.1 ~ 141.0HV, and tensile strength is 466MPa, and percentage elongation is 30.6%.
Embodiment 2
(1) heat-treatment furnace is warming up to 500 DEG C, original for 7050-T7451 aluminium alloy slab is put into heat-treatment furnace and heats 2.5h, obtain 7050 aluminum alloy plate materials after heat treatment;
(2) 7050 aluminum alloy plate materials after heat treatment are quenched and align;
(3) carry out front mixing yoghurt, stirring-head central shaft inclination angle is 2.5 °, and stirring-head rotating speed is 500 ~ 700rpm, and process velocity is 80 ~ 120mm/min, and between every time, shaft shoulder amount of lap is 35 ~ 65%, processes 5 passages;
(4) reverse side mixing yoghurt is carried out, wherein process insertion point, mixing needle center distance insertion point, passage mixing needle center, front first skew 30 ~ 55%, stirring-head central shaft inclination angle is 2.5 °, stirring-head rotating speed is 500 ~ 700rpm, process velocity is 80 ~ 120mm/min, between every time, shaft shoulder amount of lap is 35 ~ 65%, processes 4 passages, obtains 7050 aluminium alloy thick plates that mechanical performance is improved.
Experimental result: performance test is carried out to 7050 aluminium alloy thick plates of the present embodiment, the obvious refinement of crystal grain, microstructure is even, the precipitated phase quantity of positive and negative stirring area and size uniform, hardness is distributed as 144.7 ~ 152.9HV, and tensile strength is 503MPa, and percentage elongation is 31.2%.
The tensile property of 7050 aluminium alloy thick plates that table 1 adopts different processing methods to prepare compares
| Performance | 7050-T7451 original plate | Two-sided FSP | The inventive method |
| Tensile strength | 525MPa | 438~446 MPa | 466~503 MPa |
| Percentage elongation | 8.9% | 24.3 ~29.8 % | 30.6~31.2% |
| Hardness distributes | - | 108.6~137.1 HV | 130.1~152.9HV |
| Crystallite dimension | The bacillar structure of >=100 μm | ≤ 10 μm of Ultra-fine Graineds | ≤ 10 μm of Ultra-fine Graineds |
| Precipitated phase | Precipitated phase is thick, quantity is many | Processing stirring area, front precipitated phase is more than reverse side processing stirring area quantity, size is large | In the stirring area of positive and negative processing, precipitate size and quantity do not have significant difference |
Claims (2)
1. improve a processing method for 7050-T7451 aluminium alloy thick plate mechanical performance, it is characterized in that comprising following processing step:
(1) heat-treatment furnace is warming up to 450 ~ 500 DEG C, original for 7050-T7451 aluminium alloy slab is put into heat-treatment furnace heating 2.5 ~ 6h, obtain 7050 aluminum alloy plate materials after heat treatment;
(2) 7050 aluminum alloy plate materials after heat treatment are quenched and align;
(3) carry out front mixing yoghurt, stirring-head central shaft inclination angle is 2.5 °, and stirring-head rotating speed is 500 ~ 700rpm, and process velocity is 80 ~ 120mm/min, and between every time, shaft shoulder amount of lap is 35 ~ 65%, processes 5 passages;
(4) reverse side mixing yoghurt is carried out, wherein process insertion point, mixing needle center distance insertion point, passage mixing needle center, front first skew 30 ~ 55%, stirring-head central shaft inclination angle is 2.5 °, stirring-head rotating speed is 500 ~ 700rpm, process velocity is 80 ~ 120mm/min, between every time, shaft shoulder amount of lap is 35 ~ 65%, processes 4 passages, obtains 7050 aluminium alloy thick plates that mechanical performance is improved.
2. a kind of processing method improving 7050-T7451 aluminium alloy thick plate mechanical performance according to claim 1, it is characterized in that the 7050 aluminium alloy thick plate hardness that described mechanical performance is improved are distributed as 130.1 ~ 152.9HV, tensile strength is 466 ~ 503MPa, and percentage elongation is 30.6 ~ 31.2%.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105385820A (en) * | 2015-12-25 | 2016-03-09 | 中国航空工业集团公司北京航空制造工程研究所 | Grain refinement method of medium-thickness plate alloy material |
| CN107150165A (en) * | 2017-04-19 | 2017-09-12 | 东北大学 | A kind of method that mixing yoghurt prevention aluminum alloy lapped welds grain boundary liquation crackle |
| CN107214231A (en) * | 2017-06-16 | 2017-09-29 | 广东工业大学 | A kind of processing method for improving aluminum alloy plate materials deep drawability |
| CN107557626A (en) * | 2017-10-09 | 2018-01-09 | 燕山大学 | A kind of method for preparing anisotropy aluminum alloy plate materials |
| CN109773327A (en) * | 2019-02-02 | 2019-05-21 | 中铝材料应用研究院有限公司 | A method of improving high-strength aluminium room temperature forming |
| CN109940259A (en) * | 2019-02-02 | 2019-06-28 | 中铝材料应用研究院有限公司 | A method of improving aluminum alloy plate materials bending and forming |
| CN110284084A (en) * | 2019-06-28 | 2019-09-27 | 江苏理工学院 | A kind of high-strength abrasion-proof aluminum alloy plate plastic molding method |
| CN110306132A (en) * | 2019-06-28 | 2019-10-08 | 江苏理工学院 | A kind of plastic processing method improving 2A14 aluminum alloy plate materials comprehensive mechanical property |
| CN112518241A (en) * | 2020-11-19 | 2021-03-19 | 山东科技大学 | Preparation method and application of nickel-aluminum bronze/zinc-based nano composite material |
| CN112935520A (en) * | 2021-02-19 | 2021-06-11 | 长沙学院 | Processing method for improving discharge performance of aluminum anode |
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Cited By (14)
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| CN105385820A (en) * | 2015-12-25 | 2016-03-09 | 中国航空工业集团公司北京航空制造工程研究所 | Grain refinement method of medium-thickness plate alloy material |
| CN107150165B (en) * | 2017-04-19 | 2020-01-07 | 东北大学 | Method for preventing aluminum alloy lap welding crystal boundary liquification cracks through friction stir processing |
| CN107150165A (en) * | 2017-04-19 | 2017-09-12 | 东北大学 | A kind of method that mixing yoghurt prevention aluminum alloy lapped welds grain boundary liquation crackle |
| CN107214231A (en) * | 2017-06-16 | 2017-09-29 | 广东工业大学 | A kind of processing method for improving aluminum alloy plate materials deep drawability |
| CN107557626A (en) * | 2017-10-09 | 2018-01-09 | 燕山大学 | A kind of method for preparing anisotropy aluminum alloy plate materials |
| CN107557626B (en) * | 2017-10-09 | 2019-02-01 | 燕山大学 | A method of preparing anisotropy aluminum alloy plate materials |
| CN109773327A (en) * | 2019-02-02 | 2019-05-21 | 中铝材料应用研究院有限公司 | A method of improving high-strength aluminium room temperature forming |
| CN109940259A (en) * | 2019-02-02 | 2019-06-28 | 中铝材料应用研究院有限公司 | A method of improving aluminum alloy plate materials bending and forming |
| CN110284084A (en) * | 2019-06-28 | 2019-09-27 | 江苏理工学院 | A kind of high-strength abrasion-proof aluminum alloy plate plastic molding method |
| CN110306132A (en) * | 2019-06-28 | 2019-10-08 | 江苏理工学院 | A kind of plastic processing method improving 2A14 aluminum alloy plate materials comprehensive mechanical property |
| CN110306132B (en) * | 2019-06-28 | 2021-05-18 | 江苏理工学院 | Plastic processing method for improving comprehensive mechanical property of 2A14 aluminum alloy plate |
| CN110284084B (en) * | 2019-06-28 | 2021-09-28 | 江苏理工学院 | Plastic forming method for high-strength wear-resistant aluminum alloy plate |
| CN112518241A (en) * | 2020-11-19 | 2021-03-19 | 山东科技大学 | Preparation method and application of nickel-aluminum bronze/zinc-based nano composite material |
| CN112935520A (en) * | 2021-02-19 | 2021-06-11 | 长沙学院 | Processing method for improving discharge performance of aluminum anode |
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