CN116024510A - Novel process for improving performance of AlCuMgAg series heat-resistant aluminum alloy - Google Patents
Novel process for improving performance of AlCuMgAg series heat-resistant aluminum alloy Download PDFInfo
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- CN116024510A CN116024510A CN202211727780.0A CN202211727780A CN116024510A CN 116024510 A CN116024510 A CN 116024510A CN 202211727780 A CN202211727780 A CN 202211727780A CN 116024510 A CN116024510 A CN 116024510A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000008569 process Effects 0.000 title claims abstract description 25
- 239000000956 alloy Substances 0.000 claims abstract description 50
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 48
- 230000032683 aging Effects 0.000 claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 19
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001556 precipitation Methods 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 16
- 239000006104 solid solution Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000005097 cold rolling Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000001192 hot extrusion Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The scheme belongs to the technical field of metal materials, and particularly relates to a novel process for improving the performance of AlCuMgAg series heat-resistant aluminum alloys. The method comprises the following steps: step one: carrying out solution treatment on AlCuMgAg alloy, and carrying out a second step: carrying out pre-aging treatment on the AlCuMgAg alloy subjected to solution treatment at 100-400 ℃, and carrying out a step three: performing controlled rolling deformation on the AlCuMgAg alloy subjected to the pre-ageing treatment, wherein the pressing amount is 10-90%, and the step four is as follows: and (3) carrying out single-pass or multi-pass controlled rolling on the AlCuMgAg alloy, and returning to the furnace for heat preservation. The scheme adopts a pre-ageing temperature control rolling process, combines temperature and strain quantity to regulate and control microstructure and precipitation simultaneously, improves tissue and performance, and obtains room temperature performance and heat resistance superior to T6 state.
Description
Technical Field
The scheme belongs to the technical field of metal materials, and particularly relates to a novel process for improving the performance of AlCuMgAg series heat-resistant aluminum alloys.
Background
The heat-resistant aluminum alloy mainly refers to a material which is used stably for a long time or a short time at the temperature of more than 150 ℃, and has the characteristics of low density, low cost, excellent comprehensive mechanical properties and the like. Among them, the AlCuMg alloy can further improve the use temperature range by adding Ag element to form an omega phase (Al 2 Cu).
The conventional heat treatment mode of the AlCuMgAg series heat-resistant aluminum alloy is T6, namely solution treatment and artificial aging treatment, however, the design of alloy elements has great influence on a precipitated phase, and the tiny fluctuation of components can cause great change of performance, which is due to the competition relationship between a theta' phase and an omega phase in the precipitation process. Therefore, how to break through the traditional heat treatment mode to improve the room temperature performance and the heat resistance of the AlCuMgAg alloy is very important.
The patent with the application number of CN200910312318.2 discloses a preparation method of AlCuMgAg superfine crystal heat-resistant aluminum alloy, which comprises the following steps: and finally improving the heat resistance of the AlCuMgAg alloy by hot extrusion, solution quenching, constant diameter angle extrusion and aging treatment. The hot extrusion is carried out by homogenizing and annealing the cast aluminum alloy and then carrying out hot extrusion with the extrusion ratio of 8-15; then carrying out multi-pass equal-diameter angular hot extrusion deformation at 350-430 ℃, finally carrying out solution treatment, quenching in water at room temperature, and then carrying out aging treatment at 150-210 ℃; or the hot extrusion state alloy is subjected to solution treatment and then quenched in room temperature water, then subjected to multi-pass equal-diameter angular extrusion deformation at room temperature, and then subjected to aging treatment.
The process is simple, the operation is convenient, the crystal grains of the AlCuMgAg alloy can be effectively refined, the density of a precipitation strengthening phase is improved, and the overall strength and the high-temperature heat resistance of the AlCuMgAg alloy are improved; can realize industrial production and application. However, for AlCuMgAg alloys, the introduction of dislocations promotes the theta' phase (Al 2 Cu) so that the θ' phase gains advantage in competing with precipitation of the Ω phase. Compared with the omega phase, the theta 'phase has poor coarsening resistance and is not suitable as a heat-resistant phase, and when the theta' phase is greatly precipitated in a matrix, a great amount of Cu element is consumed, so that the omega-phase nucleation which also needs the Cu element is limited, and the heat resistance of the AlCuMgAg alloy is reduced.
Disclosure of Invention
The preparation process of the novel AlCuMgAg series heat-resistant aluminum alloy can improve the heat resistance of AlCuMgAg alloy.
In order to achieve the above purpose, the present solution provides a new process for improving the performance of an alcumag-based heat-resistant aluminum alloy, comprising the following steps:
step one: carrying out solution treatment on AlCuMgAg alloy,
step two: pre-aging AlCuMgAg alloy after solution treatment at 100-400 ℃,
step three: performing controlled rolling deformation on the AlCuMgAg alloy subjected to the pre-ageing treatment, wherein the pressing amount is 10-90%,
step four: and (3) carrying out single-pass or multi-pass controlled rolling on the AlCuMgAg alloy, and returning to the furnace for heat preservation.
The principle of the scheme is as follows: by combining pre-aging with temperature control rolling and subsequent heat treatment, a large amount of fine omega phase and a small amount of theta' phase are separated out from the alloy, the room temperature and heat resistance of the AlCuMgAg heat-resistant aluminum alloy are improved, and the process for improving the more universal performance of the AlCuMgAg heat-resistant aluminum alloy is obtained.
The beneficial effect of this scheme:
(1) The pre-ageing temperature control rolling process is adopted, and the microstructure and precipitation are regulated and controlled simultaneously by combining the temperature and the strain, so that the microstructure and the performance are improved, and the room temperature performance and the heat resistance which are superior to those of a T6 state are obtained.
(2) Compared with the traditional T6 process, the omega phase obtained under the same cold rolling deformation condition is more, finer, more stable, higher in strength and hardness, and still has higher strength after high-temperature heat exposure.
In the first step, the mass percentage of Cu element in the AlCuMgAg alloy is 3.0-6.0%, the mass percentage of Mg element is 0.15-1.0%, the mass percentage of Ag element is 0.3-0.9%, and the balance is Al.
In the first step, the mass percentage of the AlCuMgAg alloy Cu element is 3.0%, and the mass percentage of the Ag element is 0.3%.
Further, in the first step, the solution treatment time is 2 hours.
Further, in the first step, solution treatment is performed at 550 ℃ for 2 hours, followed by water quenching to room temperature. The main purpose of the solution treatment is to obtain a solid solution with the maximum supersaturation degree by mixing a large amount of elements such as Cu, mg, ag and the like in the alloy into a matrix without overburning the alloy. The solid solution process is a process of atomic diffusion, and is mainly affected by factors such as a solid solution temperature, a solid solution time, and a quenching cooling rate, wherein the factor affecting the maximum is the solid solution temperature, and thus setting the solid solution temperature to 550 ℃ is advantageous for an increase in solid solution concentration of the matrix.
Further, the pre-ageing treatment time is 5 min-10 h.
In the first step, after the sample after solution treatment is subjected to a novel rolling process, a large amount of fine omega phase and a small amount of theta' phase are precipitated in the AlCuMgAg alloy.
Drawings
FIG. 1 is a transmission electron microscope image of AlCuMgAg alloy with the same component after different condition peak aging: (a-b) T6 peak aging samples; (c-d) cold rolling-peak aging samples; (e-f) novel rolling process-peak aging samples.
FIG. 2 is a graph showing the aging hardness curves of AlCuMgAg alloy samples at the same temperature for different conditions.
Fig. 3 is a tensile stress strain curve of an alcumag-based alloy.
Detailed Description
The following is a further detailed description of the embodiments:
substantially as shown in figures 1 to 3:
in the case of example 1,
the novel AlCuMgAg series heat-resistant aluminum alloy comprises the following components of 3.0% of Cu element, 0.15-1.0% of Mg element, 0.3% of Ag element and the balance of Al.
The preparation process of the novel AlCuMgAg series heat-resistant aluminum alloy comprises the following steps:
step one: the AlCuMgAg alloy is subjected to solution treatment, and is subjected to solution treatment at 550 ℃ for 2 hours, and then is quenched to room temperature.
Step two: and carrying out pre-ageing treatment on the AlCuMgAg alloy subjected to solution treatment at 100-400 ℃ for 5 min-10 h.
Step three: performing controlled rolling deformation on the AlCuMgAg alloy subjected to the pre-ageing treatment, wherein the pressing amount is 10-90%,
step four: and (3) rolling AlCuMgAg alloy in single or multiple passes, and then returning to the furnace for heat preservation.
After the sample after solution treatment is subjected to a novel rolling process, as can be seen from fig. 1, a large amount of fine omega phase and a small amount of theta' phase are precipitated in the alloy. The rolled plate is subjected to a tensile test, and the tensile speed is 10 -4 s-1, the stretching curve is shown in figure 3.
Example 2, T6 treatment Process
The AlCuMgAg aluminum alloy comprises the following components of 3.0% of Cu element, 0.15-1.0% of Mg element, 0.3% of Ag element and the balance of Al.
The preparation process of the AlCuMgAg aluminum alloy comprises the following steps:
step one: performing double-stage solid solution treatment on AlCuMgAg alloy to obtain a solid solution treated alloy; the first-stage solid solution treatment system of the two-stage solid solution treatment is 440 ℃ for 6h, and the second-stage solid solution treatment system is 470 ℃ for 24h;
step two: quenching the AlCuMgAg alloy subjected to solution treatment;
step three: and (3) placing the alloy subjected to quenching treatment in a microwave heat treatment furnace, carrying out regression and reaging treatment, carrying out first T6 treatment, then heating to 230-250 ℃, carrying out heat preservation and regression treatment, carrying out water quenching, then carrying out second T6 treatment, and discharging and air cooling to room temperature.
Example 3 Cold Rolling treatment Process
The AlCuMgAg aluminum alloy comprises the following components of 3.0% of Cu element, 0.15-1.0% of Mg element, 0.3% of Ag element and the balance of Al.
The preparation process of the AlCuMgAg heat aluminum alloy comprises the following steps:
step one: the AlCuMgAg alloy is hot rolled and then cooled to room temperature, and the aluminum alloy plate is placed into a liquid nitrogen refrigerating high-low temperature test chamber for cooling treatment;
step two: and (3) placing the aluminum alloy cooled to room temperature after hot rolling into a liquid nitrogen refrigerating high-low temperature test box, adopting a low temperature gear control system of the liquid nitrogen refrigerating high-low temperature test box, spraying liquid nitrogen into the high-low temperature test box, cooling, setting a temperature target value of-60 to-40 ℃, and keeping the temperature for 15-25 min, so that the aluminum alloy plate is completely soaked at the set temperature.
Step three: carrying out multi-pass cold rolling on the aluminum alloy subjected to the low-temperature treatment on a cold rolling mill, wherein the reduction rate of each pass is 110-90%, and after each pass is finished, continuously cooling the aluminum alloy plate to enable the temperature to be below-40 ℃, and repeating the cold rolling for a plurality of times.
As can be seen from examples 1 to 3, the alcumag heat-resistant aluminum alloy of the present invention adopts a new process, which is more, finer and more stable than the conventional T6 process, even under the same cold rolling deformation condition, as shown in fig. 1 (e), less θ' phase, as shown in fig. 1 (f), and higher strength and hardness, as shown in fig. 2 and 3; but also has higher strength after high temperature exposure.
In FIG. 1, after the conventional T6 peak aging, both the omega phase (FIG. 1 a) and the theta' phase (FIG. 1 b) are very coarse in the tissue. After cold rolling and peak aging, the omega phase (FIG. 1 c) is refined in the structure, but a large amount of theta' phase is present at the same time (FIG. 1 d). And after adopting a novel rolling process, the same strain quantity is mainly precipitated in a structure (figure 1 e) and is refined, and the theta' phase (figure 1 f) is less.
As shown in fig. 3.
Compared with the traditional process, the invention has the advantages that:
the novel rolling process can reach the peak aging state faster by adopting the same alloy composition design.
The novel rolling heat treatment process has higher strength and better heat resistance with the same alloy composition design.
The structure and performance of AlCuMgAg alloy can be improved by rolling process.
Moreover, the AlCuMgAg-series heat-resistant aluminum alloy material prepared according to the process in the embodiment 1 can be used in aerospace, new energy automobiles, electric control protective materials and motor protective materials, and has good physical properties and mechanical properties, because the AlCuMgAg-series heat-resistant aluminum alloy material can exist stably for a long time at 200 ℃ without coarsening and without aggregation growth, the AlCuMgAg alloy has considerable heat strength at 200 ℃ or even above 200 ℃, and further has longer service life, good market application prospect and popularization value.
The foregoing is merely exemplary embodiments of the present invention, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (7)
1. A novel process for improving the performance of AlCuMgAg series heat-resistant aluminum alloy is characterized by comprising the following steps:
the method comprises the following steps:
step one: carrying out solution treatment on AlCuMgAg alloy,
step two: pre-aging AlCuMgAg alloy after solution treatment at 100-400 ℃,
step three: performing controlled rolling deformation on the AlCuMgAg alloy subjected to the pre-ageing treatment, wherein the pressing amount is 10-90%,
step four: and (3) carrying out single-pass or multi-pass controlled rolling on the AlCuMgAg alloy, and returning to the furnace for heat preservation.
2. The novel process for improving the performance of the AlCuMgAg series heat-resistant aluminum alloy according to claim 1, which is characterized in that: in the first step, the mass percentage of Cu element in the AlCuMgAg alloy is 3.0-6.0%, the mass percentage of Mg element is 0.15-1.0%, the mass percentage of Ag element is 0.3-0.9%, and the balance is Al.
3. The novel process for improving the performance of the AlCuMgAg series heat-resistant aluminum alloy according to claim 2, which is characterized in that: in the first step, the mass percentage of the AlCuMgAg alloy Cu element is 3.0%, and the mass percentage of the Ag element is 0.3%.
4. The novel process for improving the performance of the AlCuMgAg series heat-resistant aluminum alloy according to claim 1, which is characterized in that: in the first step, the solution treatment time is 2 hours.
5. The novel process for improving the performance of the AlCuMgAg-series heat-resistant aluminum alloy according to claim 4, which is characterized in that: in the first step, solution treatment is carried out at 550 ℃ for 2 hours, and then water quenching is carried out to room temperature.
6. The novel process for improving the performance of the AlCuMgAg series heat-resistant aluminum alloy according to claim 1, which is characterized in that: the pre-ageing treatment time is 5 min-10 h.
7. The novel process for improving the performance of the AlCuMgAg series heat-resistant aluminum alloy according to claim 1, which is characterized in that: in the first step, after the sample after solution treatment is subjected to a novel rolling process, a large amount of fine omega phases and a small amount of theta' phases are separated out from the AlCuMgAg alloy.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003027170A (en) * | 2001-07-10 | 2003-01-29 | Kobe Steel Ltd | Aluminum-alloy material with excellent room- temperature aging controllability and low-temperature age hardenability |
| CN1556236A (en) * | 2003-12-30 | 2004-12-22 | 上海交通大学 | Titanium alloyed aluminium copper magnesium silver series high strength heat resistant aluminium alloy |
| US20070151637A1 (en) * | 2005-10-28 | 2007-07-05 | Aleris Aluminum Koblenz Gmbh | Al-Cu-Mg ALLOY SUITABLE FOR AEROSPACE APPLICATION |
| CN101876041A (en) * | 2009-12-25 | 2010-11-03 | 中南大学 | Preparation method of Al-Cu-Mg-Ag ultrafine crystal heat-resistant aluminum alloy |
| CN102888576A (en) * | 2012-10-17 | 2013-01-23 | 常州大学 | Novel thermo-mechanical treatment method for improving toughness of 2618 heat-resistant aluminum alloy |
| JP2013142168A (en) * | 2012-01-11 | 2013-07-22 | Furukawa-Sky Aluminum Corp | Aluminum alloy excellent in creep resistance |
| CA2997024A1 (en) * | 2015-09-03 | 2017-03-09 | Constellium Issoire | Extruded product made from al-cu-mg alloy with improved compromise between mechanical resistance and toughness |
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- 2022-12-29 CN CN202211727780.0A patent/CN116024510B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003027170A (en) * | 2001-07-10 | 2003-01-29 | Kobe Steel Ltd | Aluminum-alloy material with excellent room- temperature aging controllability and low-temperature age hardenability |
| CN1556236A (en) * | 2003-12-30 | 2004-12-22 | 上海交通大学 | Titanium alloyed aluminium copper magnesium silver series high strength heat resistant aluminium alloy |
| US20070151637A1 (en) * | 2005-10-28 | 2007-07-05 | Aleris Aluminum Koblenz Gmbh | Al-Cu-Mg ALLOY SUITABLE FOR AEROSPACE APPLICATION |
| CN101876041A (en) * | 2009-12-25 | 2010-11-03 | 中南大学 | Preparation method of Al-Cu-Mg-Ag ultrafine crystal heat-resistant aluminum alloy |
| JP2013142168A (en) * | 2012-01-11 | 2013-07-22 | Furukawa-Sky Aluminum Corp | Aluminum alloy excellent in creep resistance |
| CN102888576A (en) * | 2012-10-17 | 2013-01-23 | 常州大学 | Novel thermo-mechanical treatment method for improving toughness of 2618 heat-resistant aluminum alloy |
| CA2997024A1 (en) * | 2015-09-03 | 2017-03-09 | Constellium Issoire | Extruded product made from al-cu-mg alloy with improved compromise between mechanical resistance and toughness |
Non-Patent Citations (1)
| Title |
|---|
| ZHE YU, ET AL.: "Microstructure, mechanical properties and thermal stability of friction-stir-processed Al-Cu-Mg-Ag alloy", MATERIALS SCIENCE&ENGINEERING A, vol. 863, pages 1 - 11 * |
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