CN101570839B - High field aging heat treatment method for aluminum alloy - Google Patents
High field aging heat treatment method for aluminum alloy Download PDFInfo
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- CN101570839B CN101570839B CN2009100432095A CN200910043209A CN101570839B CN 101570839 B CN101570839 B CN 101570839B CN 2009100432095 A CN2009100432095 A CN 2009100432095A CN 200910043209 A CN200910043209 A CN 200910043209A CN 101570839 B CN101570839 B CN 101570839B
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Abstract
The invention relates to a high field aging heat treatment method for a 2E12 aluminum alloy, which comprises the following processing steps: performing solid solution on the 2E12 aluminum alloy to be heat-treated at the temperature of 498 to 502 DEG C; and putting the 2E12 aluminum alloy to be heat-treated in a high field for aging. After the aluminum alloy is subjected to conventional solid solution treatment, the electric energy is directly transmitted to the atomic scale of a material by utilizing the high field so as to change the array process, the matching process, the transport process of atoms on the one hand, influence the diffusion process of vacant positions of the materials on the other hand, and further influence the forms and quantity of precipitated phases to control growth forms, sizes, distribution, orientation and the like of a crystal generated in solid-state phase changes of the material, control a structure of the material and make the material acquire excellent comprehensive mechanical properties. The method is simple and easy to operate, controls the forms and distribution of the precipitated phases of a crystal boundary through electric field, simultaneouslyreduces the precipitated quantity of intercrystalline second phases, effectively improves the plasticity, the fatigue resistance and the damage resistance of the 2E12 aluminum alloy, and is suitable for industrialized production.
Description
Technical field
The present invention relates to the ageing hot processing method of 2E12 aluminium alloy, be meant the high field aging heat treatment method of 2E12 aluminium alloy especially, belong to metallic substance electromagnetic field thermal treatment field.
Background technology
The 2E12 aluminium alloy is abroad on the 2524 aluminium alloy bases, and a kind of high-performance Al-Cu-Mg alloy of the up-to-date development of China is the important structure material of covering, rib and spar, empennage under fuselage skin, fuselage ring, the wing.Its chemical ingredients (massfraction %): Cu 4.0-4.5, Mg 1.2-1.6, Mn 0.45-0.7, Fe≤0.12, Si≤0.06, surplus Al.
The 2E12 aluminium alloy is by content that reduces impurity elements such as Fe, Si and then fracture toughness property, fatigue and the anti-stress corrosion performance that improves alloy.2E12 high strength alumin ium alloy sheet material manufacturing process complexity, adopt prior heat treatment process that the 2E12 aluminum alloy plate materials is carried out timeliness thermal treatment, though can reach plasticity and anti-fatigue performance preferably, but for the envrionment conditions of its military service, its plasticity and anti-fatigue performance still seem inadequately, have much room for improvement; Therefore the 2E12 aluminium alloy electric field thermal treatment process of development of new improves its plasticity and antifatigue damage performance, and tool has very important significance.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art and a kind of, the form that can effectively improve 2E12 aluminium alloy intracrystalline and crystal boundary second phase particle simple, easy to operate for processing method is provided, separates out quantity and distribution, improve the high field aging heat treatment method of the 2E12 aluminium alloy of 2E12 aluminium alloy plasticity and antifatigue damage performance.
2E12 aluminium alloy high field aging heat treatment method of the present invention, be to adopt following technology to realize: with 2E12 aluminium alloy to be heated at 498 ~ 502 ℃ of solid solution 30 ~ 60min, come out of the stove after the shrend, the highfield of putting into strength of electric field 1 ~ 16kv/cm carries out timeliness, aging temp is: 180 ~ 190 ℃, the time is: 9 ~ 11 hours.
In the 2E12 aluminium alloy high field aging heat treatment method of the present invention, described strength of electric field is 6 ~ 10kv/cm.
In the 2E12 aluminium alloy high field aging heat treatment method of the present invention, described strength of electric field is 8kv/cm.
The present invention is owing to adopt above-mentioned processing method, after the conventional solution treatment of aluminium alloy, utilize highfield with the contactless atomic scale that is transmitted to material of high-intensity electric energy, change the processes such as arrangement, coupling and migration of atom on the one hand, on the other hand, influence the diffusion process in room in the material and then influence the form and the quantity of precipitated phase, crystalline growthhabit, size, distribution and the orientation etc. that take place in the material solid-state phase changes are controlled, thereby the tissue of control material finally obtains good physicals and mechanical property.After adopting processing method of the present invention to 2E12 alloy electric field timeliness, on the one hand, the intracrystalline S ' of 2E12 alloy is more tiny mutually, and the fatigue property of alloy and plasticity improve; On the other hand, room when diffusion since electric field influence the potential field of room periphery, make the opposite direction motion of room to strength of electric field; When running into crystal boundary in the moving process of room, promptly assemble the forming core point that becomes the crystal boundary ultramicron at crystal boundary, on crystal boundary, form the ultrafine particle phase that disperse distributes; In addition, because the existence of electric field broadens the crystal boundary perpendicular to direction of an electric field, this special crystal boundary will obviously improve the plastic deformation ability of material; Therefore, after the 2E12 aluminium alloy carried out high field aging thermal treatment, can effectively improve the granularity and the dispersity of intracrystalline second phase, the ultrafine particle that the crystal boundary disperse distributes obviously increases mutually, and the crystal boundary perpendicular to direction of an electric field is broadened, the variation stack of above-mentioned several conditions has caused the plasticity of 2E12 aluminium alloy, anti-fatigue performance obviously to increase than conventional heat treated, and intensity only descends slightly.
In sum, the inventive method is simple, and is easy to operate, controls the form and the distribution of crystal boundary precipitated phase by electric field, reduces the quantity of separating out of intracrystalline second phase simultaneously, effectively improved the plasticity and the antifatigue damage performance of 2E12 aluminium alloy; Be suitable for suitability for industrialized production.
Description of drawings
Accompanying drawing 1 (a) is 0 for the 2E12 aluminium alloy in strength of electric field, and temperature is 10 hours intracrystalline of 190 ℃ of timeliness, the second phase TEM photo.
Accompanying drawing 1 (b) is 16kv/cm for the 2E12 aluminium alloy in strength of electric field, and temperature is 10 hours intracrystalline of 190 ℃ of timeliness, the second phase TEM photo.
Accompanying drawing 2 (a) is 0 for the 2E12 aluminium alloy in strength of electric field, and temperature is 10 hours intracrystalline crystal boundary TEM photos of 190 ℃ of timeliness.
Accompanying drawing 2 (b) is 16kv/cm for the 2E12 aluminium alloy in strength of electric field, and temperature is 10 hours intracrystalline crystal boundary TEM photos of 190 ℃ of timeliness.
Accompanying drawing 3 is the crack growth rate figure of 2E12 aluminium alloy.
Comparative drawings figs 1 (a) and accompanying drawing 1 (b), as can be seen, after the added electric field timeliness, the T phase particle in the 2E12 aluminium alloy diminishes, and the distance between the T phase becomes sparse, and needle-like S ' attenuates mutually and shortens.
Comparative drawings figs 2 (a) and accompanying drawing 2 (b), as can be seen, after the added electric field timeliness, the crystal boundary of 2E12 aluminium alloy has obviously broadened.
Among Fig. 3,1---is at f=10Hz, and stress ratio is to the crack growth rate experimental result after the 2E12 aluminium alloy timeliness when adding the 16Kv/cm electric field under 0.1 condition; 2----is at f=10Hz, and stress ratio is the crack growth rate experimental result of added electric field after to 2E12 aluminium alloy timeliness not under 0.1 condition;
Embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment one
It is the 2E12 aluminium alloy cold rolled sheet of 2mm that sample adopts thickness.GB228-76 makes tension specimen by GB.Sample is put into salt bath solid solution 30min about 498 ℃, take out at once and quench.Put into 190 ℃ of constant temperature ovens then and carry out electric field timeliness 10h, strength of electric field is respectively 0,16kV/cm.Alloy mechanical property sees Table 1 after the timeliness.
Table 1
As known from Table 1, the 2E12 aluminium alloy is under the high-strength electric field effect of 16kV/cm, and the yield strength of alloy has reduced less than 10Mpa, and unit elongation but brings up to 23% from 21%.
Embodiment two
Sample adopts 2mm 2E12 aluminium alloy cold rolled sheet, adds 8kV/cm electric field timeliness 10h hour and not after the added electric field ageing treatment, makes the fatigue crack growth sample by GB GB/T 6398-2000 in 498 ℃ of solid solutions 60 minutes, 190 ℃.The Instron protracted test machine is adopted in the fatigue crack growth rate test, test frequency: f=10Hz, wave mode is selected sine wave for use, and stress ratio is respectively 0.1, mensuration adds the 12kV/cm electric field aging samples and the fatigue crack growth rate of added electric field aging samples not, sees accompanying drawing 3.The result shows from accompanying drawing, and under identical stress intensity factor, the crack growth rate that adds 12kV/cm electric field aging samples obviously reduces than added electric field aging crack spreading rate not.
Embodiment three
It is 2mm 2E12 aluminium alloy cold rolled sheet that sample adopts thickness; Sheet material is made tension specimen by GB GB228-76.Sample is put into the salt bath solid solution 30min about 498 ℃, takes out at once and quenches.Put into 190 ℃ of constant temperature ovens then and carry out electric field timeliness 10h, strength of electric field is 1kV/cm.Alloy is at maximum stress 260Mpa after the timeliness, and stress ratio is 0.1 time, carries out experiment fatigue lifetime, and test-results sees Table 2.Bring up to 117239 time from 98346 times average fatigue lifetime.
Table 2
As can be known from the results of Table 2, at maximum stress 260Mpa, stress ratio is 0.1 time, is 1kV/cm through strength of electric field, and temperature is that the average fatigue life ratio of 2E12 aluminium alloy of 190 ℃ of timeliness 10h average fatigue lifetime improves 2000 cycles nearly without the 2E12 aluminium alloy of high field aging.
Claims (3)
1.2E12 aluminium alloy high field aging heat treatment method, comprise following processing step: with 2E12 aluminium alloy to be heated at 498 ~ 502 ℃ of solid solution 30 ~ 60min, come out of the stove after the shrend, the highfield of putting into strength of electric field 1 ~ 16kv/cm carries out timeliness, aging temp is: 180 ~ 190 ℃, the time is: 9 ~ 11 hours.
2. 2E12 aluminium alloy high field aging heat treatment method according to claim 1 is characterized in that: described strength of electric field is 6 ~ 10kv/cm.
3. 2E12 aluminium alloy high field aging heat treatment method according to claim 1 is characterized in that: described strength of electric field is 8kv/cm.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101921977B (en) * | 2010-09-08 | 2012-05-23 | 中南大学 | Aging thermal treating process of heat-treatable strengthened aluminum alloy |
| CN103614673B (en) * | 2013-04-11 | 2016-08-17 | 中南大学 | One can realize aluminium alloy quick aging heat treatment method |
| CN104357775A (en) * | 2014-10-24 | 2015-02-18 | 陈帆 | Processing method for 2017 aluminum alloy plate |
| CN104357777A (en) * | 2014-10-24 | 2015-02-18 | 陈帆 | Processing method of 2A01 aluminum alloy plate |
| CN105734467A (en) * | 2016-03-14 | 2016-07-06 | 哈尔滨理工大学 | Method for shortening aging treatment time of 7005 aluminum alloy |
| CN109252116B (en) * | 2018-11-01 | 2021-03-30 | 上海理工大学 | Method for assisting aging heat treatment of magnesium-aluminum alloy by adopting electrostatic field |
| CN109680230B (en) * | 2019-02-26 | 2021-01-19 | 武汉理工大学 | Electromagnetic pulse rapid solid solution-aging process for aluminum alloy component |
| CN110373534B (en) * | 2019-07-25 | 2021-06-08 | 赵京晨 | Method for slowing crack generation and propagation of solid part |
| CN114350932B (en) * | 2022-01-11 | 2023-03-10 | 西安交通大学 | Post-treatment method for solid solution-free precipitation-strengthened metal additive manufacturing thin-wall component |
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