CN108754258A - 7055 aluminium alloys of one kind and its aging technique - Google Patents
7055 aluminium alloys of one kind and its aging technique Download PDFInfo
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- CN108754258A CN108754258A CN201810666009.4A CN201810666009A CN108754258A CN 108754258 A CN108754258 A CN 108754258A CN 201810666009 A CN201810666009 A CN 201810666009A CN 108754258 A CN108754258 A CN 108754258A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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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
- C22F1/053—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 of alloys with zinc as the next major constituent
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Abstract
The invention discloses a kind of 7055 aluminium alloys and its aging techniques, and after 470 DEG C × 4h solid solutions, the single-stage aging processing of different time is carried out under different aging temps, last air-cooled；The formulation of aging treatment process has considered the factors such as alloying component, processing method, microstructure article shape, heating condition, heat medium, batch and basic soaking time.7055 intensity of aluminum alloy of the invention are high, fracture toughness is preferable, and fatigue crack extended capability is strong, which has resistance to intercrystalline failure and corrosion, the best single-stage aging technique of 7055 aluminium alloys of the present invention is 120 DEG C × 4h, and the tensile strength after timeliness reaches 660MPa.Tem analysis the result shows that, 7055 aluminium alloys main phases precipitated in 120 DEG C of timeliness 4h is the areas GPI, when to timeliness 8h, start the areas Xiang Yu GPI η ' occur in matrix and deposit, with the extension of aging time, η ' phase volume fractions in alloy are continuously increased, and are for 24 hours that alloy matrix precipitate is substantially based on η ' phases to aging time.
Description
Technical field
The present invention relates to technical field of aluminum alloy technology, more particularly to a kind of 7055 aluminium alloys and its aging technique.
Background technology
High strength alumin ium alloy is one of primary structure material of aircraft industry.Modern Aviation industrial expansion, it is desired to aviation knot
Structure material has higher intensity, better fracture toughness (KIC), stress-corrosion-cracking resistance (SCC) and anti-fatigue performance.
7055 ultra-high-strength aluminum alloys are the highest alloys of intensity in current wrought aluminium alloy, and the 7055-T77 of Alcoa's production is closed
Golden timber intensity is higher by 10% than 7150, is higher by 30% than 7075, and fracture toughness is preferable, fatigue crack propagation energy
Power is strong.The alloy has resistance to intercrystalline failure and corrosion.The technical staff of Dongbei Light Alloy Co., Ltd and northeast
University, Central South University, Beijing Non-Ferrous Metal Research General Academy experts and scholars a large amount of careful researchs have been done to 7055 alloys together.
The result shows that it is since its chemical element composition and microstructure are determined why 7055 alloys, which have so good comprehensive performance,
Fixed.In order to preferably apply the alloy, it is based on this, has studied 7055 aluminium alloys of one kind and its aging technique.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of 7055 aluminium alloys and its aging techniques.
The present invention is achieved by the following technical solutions：A kind of 7055 aluminium alloys, including following materials in percentage by mass：
。
One of preferred embodiment as the present invention, the materials in percentage by mass is：
One of preferred embodiment as the present invention, the materials in percentage by mass is：
One of preferred embodiment as the present invention, the materials in percentage by mass is：
The invention also discloses a kind of aging technique of 7055 aluminium alloy, 7055 aluminium alloy is dissolved through 470 DEG C × 4h
Afterwards, the single-stage aging processing of different time is carried out under different aging temps, it is last air-cooled；The formulation of aging treatment process integrates
Consider alloying component, processing method, microstructure article shape, heating condition, heat medium, batch and basic guarantor
The factors such as warm time, totally 9 kinds of aging treatment process.
One of preferred embodiment as the present invention, the difference aging temp are with the time：100℃×4h,100℃×
8h、120℃×4h、120℃×8h、150℃×4h、150℃×8h。
One of preferred embodiment as the present invention, the optimal aging temp is with the time：120℃×4h.
The present invention compared with prior art the advantages of be：7055 intensity of aluminum alloy of the invention are high, and fracture toughness is preferable, resist tired
Labor crack propagation ability is strong, which has resistance, the best list of 7055 aluminium alloys of the invention to intercrystalline failure and corrosion
Grade aging technique is 120 DEG C × 4h, and the tensile strength after timeliness reaches 660MPa.Tem analysis the result shows that, 7055 aluminium alloys exist
Main phases precipitated is that the areas GPI start the areas Xiang Yu GPI η ' occur and be deposited in matrix until when timeliness 8h when 120 DEG C of timeliness 4h, with
The extension of aging time, η ' the phase volume fractions in alloy are continuously increased, and are alloy matrix precipitate base for 24 hours to aging time
This is based on η ' phases.
Specific implementation mode
It elaborates below to the embodiment of the present invention, the present embodiment is carried out lower based on the technical solution of the present invention
Implement, gives detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following implementation
Example.
Embodiment one：
A kind of 7055 aluminium alloys, including following materials in percentage by mass：
Embodiment two：
A kind of 7055 aluminium alloys, including following materials in percentage by mass：
。
Embodiment three：
A kind of 7055 aluminium alloys, including following materials in percentage by mass：
Example IV：
A kind of 7055 aluminium alloys, including following materials in percentage by mass：
Embodiment five：
The invention also discloses a kind of aging technique of 7055 aluminium alloy, 7055 aluminium alloy is dissolved through 470 DEG C × 4h
Afterwards, the single-stage aging processing of different time is carried out under different aging temps, it is last air-cooled；The formulation of aging treatment process integrates
Consider alloying component, processing method, microstructure article shape, heating condition, heat medium, batch and basic guarantor
The factors such as warm time, totally 9 kinds of aging treatment process.
One of preferred embodiment as the present invention, the difference aging temp are with the time：100℃×4h,100℃×
8h、120℃×4h、120℃×8h、150℃×4h、150℃×8h。
One of preferred embodiment as the present invention, the optimal aging temp is with the time：120℃×4h.
It is element composition and the effect of the present invention below：
7055 alloys include main alloying element Zn, Mg, Cu and Trace Zr and a small amount of Impurity Fe and Si.
Since solid solubility of most of alloying element in Al is low, being organized as of alloy is dispersed with answering for different scale in solid solution matrix
Phase particle.Wherein have size the coarse crystalline phase particle of um or more, high temperature precipitations size in um disperse phase particles below
Size with Precipitation is in 0.1um precipitated phase particles below.The content of alloying element and impurity element is more than it in Al
Limit solid solubility, that is, lead to coarse crystalline phase particle.In place of coarse crystalline phase particle is stress concentration and crack initiation,
The fracture toughness of 7055 aluminium alloys, fatigue behaviour and stress corrosion cracking are had a significant impact.Reduce coarse crystalline phase particle
It is development high-performance Al alloys firstly the need of solving the problems, such as.In 7055 ultra-high-strength aluminum alloys, the content of Mg and Zn are higher.Zn is
7.6%~8.4%, Mg are that 1.8%~2.3%, Zn/Mg ratios are more than 3.The influence of Zn, Mg and Cu to thermal effectiveness is different
's.Quenching and ageing behavior can be improved simultaneously by increasing the concentration of Zn and Mg, still, when containing Zn more than 5% in alloy, Cu be added
Due to changing solid solution concentration, quenching effect is only influenced.Hardening constituent MgZn is primarily formed in the alloy2。MgZn2Mutually in alloy
In solubility with temperature reduction and drastically decline, have very strong age hardening capability.In solid solution limit range, improve
The content of Zn, Mg can greatly improve intensity, but the toughness of alloy and anti-stress corrosion performance can be caused to reduce.In its solubility
2%~3% Cu is added into the alloy containing Zn and Mg in range, intensity, relative elongation, plasticity, resistance to can be improved simultaneously
Corrosion and repetition load drag.In high Zn alloys, Cu atoms dissolve in the areas GP, can improve the equilibrium temperature range in the areas GP, delay
Precipitation.Cu atoms can also dissolve in mutually and in phase, reduce crystal boundary and transgranular potential difference, improve the stress corrosion resistant energy of alloy
Power.For the bigger alloys of Zn/Mg, even if its Cu content is higher, remain to keep preferable toughness.In ultra-high-strength aluminum alloy
It is to obtain the basis of superperformance to keep higher Zn/Mg ratios.Cu energy reinforced alloys, are mainly strengthened by solid solution mode.To A-l
The element of Mn, Cr, Zr etc are added in Zn-Mg-Cu systems alloy, strength character and corrosion resistance can be improved.Containing Mn, Cr element
Alloy, corrosion resistance is apparently higher than the alloy without Mn, Cr.These elements are conducive to improve the recrystallization temperature of alloy
Degree prevents the progress of the recrystallization process in thermal deformation and subsequent Quench heating.Most effective addition element is Zr.Zr is added,
No matter after heat distortion or after cold deformation, the recrystallization temperature of aluminium alloy can be improved.Therefore, make it possible to
Non- recrystallized structure is obtained after heat treatment.In order to further increase the intensity of 7055 alloys, 0.05%~0.25% is generally added
Zr.Zr and Al is combined and is formed Al3Zr intermetallic compounds, there are two types of structural forms for this intermetallic compound:From melt
The Al3Zr being directly precipitated be tetragonal, can significantly refining alloy as-cast grain；Another kind is analysis during ingot homogenization
The spheroidal particle gone out has LI2 structures, with matrix coherence, has the function of consumingly inhibiting to recrystallize in hot procedure, micro-
The intensity, fracture toughness and anti-stress corrosion performance of alloy can be improved in amount Zr.Further, since the quenching sensitive of Zr is smaller, Zr
The quenching degree and weldability of alloy can also be improved.
In 7055 ultra-high-strength aluminum alloys, Fe and Si are objectionable impurities, may generate (Fe, Cr)3SiAl12、(Fe,Mn,
Cu)A16、Cu2FeAl7And Mg2The impurity phases oversize grain such as Si.In the alloy mainly with brittleness such as insoluble or indissoluble A1FeSi
The form of phase exists.After thermal processing distortion, it is easy to form the banded structure along deformation direction intermittent arrangement.Plastic history
In, it due to matrix and brittlement phase deformation, is easy to form hole on boundary, generates microcrack, become macroscopic view and split
The cradle of line significantly reduces the fracture toughness of alloy.7055 ultra-high-strength aluminum alloys are on the basis of 7075 aluminium alloy into one
What the content of both harmful elements of step control grew up.The content of the Fe of 7055 ultra-high-strength aluminum alloys must control
0.15% or less, Si content control below 0.1%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (7)
1. a kind of 7055 aluminium alloys, which is characterized in that including following materials in percentage by mass：
2. 7055 aluminium alloy according to claim 1, which is characterized in that the materials in percentage by mass is：
3. 7055 aluminium alloy according to claim 1, which is characterized in that the materials in percentage by mass is：
4. 7055 aluminium alloy according to claim 1, which is characterized in that the materials in percentage by mass is：
5. a kind of aging technique according to any 7055 aluminium alloys of claim 1-4, which is characterized in that 7055 aluminium
Alloy carries out the single-stage aging processing of different time after 470 DEG C × 4h solid solutions under different aging temps, last air-cooled；When
The formulation of effect treatment process has considered alloying component, processing method, microstructure article shape, heating condition, heating Jie
The factors such as matter, batch and basic soaking time, totally 9 kinds of aging treatment process.
6. the aging technique of 7055 aluminium alloy according to claim 5, which is characterized in that it is described difference aging temps and when
Between be：100℃×4h,100℃×8h,120℃×4h,120℃×8h,150℃×4h,150℃×8h.
7. the aging technique of 7055 aluminium alloy according to claim 6, which is characterized in that the optimal aging temp and when
Between be：120℃×4h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109666827A (en) * | 2019-02-22 | 2019-04-23 | 洛阳华陵镁业有限公司 | A kind of super-strong and super-toughened 7055Sc aluminum alloy forge piece |
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| EP1565586B1 (en) * | 2002-11-15 | 2009-06-10 | Alcoa Inc. | Aluminum alloy product having improved combinations of properties |
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| US20160160332A1 (en) * | 2014-12-09 | 2016-06-09 | Novelis Inc. | Reduced aging time of 7xxx series alloy |
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| EP1565586B1 (en) * | 2002-11-15 | 2009-06-10 | Alcoa Inc. | Aluminum alloy product having improved combinations of properties |
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|---|---|---|---|---|
| CN109666827A (en) * | 2019-02-22 | 2019-04-23 | 洛阳华陵镁业有限公司 | A kind of super-strong and super-toughened 7055Sc aluminum alloy forge piece |
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