CN105316609A - Solution treatment method for improving performance of 7022 aluminum alloy - Google Patents
Solution treatment method for improving performance of 7022 aluminum alloy Download PDFInfo
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- CN105316609A CN105316609A CN201410287770.9A CN201410287770A CN105316609A CN 105316609 A CN105316609 A CN 105316609A CN 201410287770 A CN201410287770 A CN 201410287770A CN 105316609 A CN105316609 A CN 105316609A
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Abstract
The invention discloses a solution treatment method for improving performance of 7022 aluminum alloy, which includes the following steps: 1) preparing the materials according to the composition of the 7022 aluminum alloy: Al-5.6Zn-2.5Mg-1.6Cu-0.23Cr, wherein the alloy elements Zn, Mn, Cu, Mg and Cr are added in an inter-alloy manner; 2) controlling the smelting temperature of the 7022 aluminum alloy to be 700-740 DEG C, refining the 7022 aluminum alloy with hexachloroethane being 0.2-0.4%, and allowing the alloy to stand for 10-15 min; 3) pouring the alloy into an iron die, maintaining the temperature at 462 e for 24 h, increasing the temperature to 470 e at the increasing rate of 0.5 e/h and air-cooling the alloy; 4) pre-heating a casting ingot at 400-430 DEG C and setting extrusion deformation co-efficient as 9, and performing enhancement solution treatment; 5) maintaining the temperature at 466 DEG C for 2 h, and increasing the temperature to 476 e at the increasing rate of 4 e/h and water-quenching the alloy at room temperature; and 6) instantly performing T6 artificial aging after quenching, namely, maintaining the temperature at 120 DEG C for 4 h.
Description
Technical field
The present invention relates to a kind for the treatment of process of 7022 aluminium alloys, particularly the solid solution treatment process of a kind of raising 7022 aluminium alloy capabilities.
Background technology
The application of aluminium is very wide in a metal, be only second to iron and steel, and content ranking is at the metallic element of first place, is thus called as second largest metalloid material.7B50 aluminium alloy market outlook are good, with high content of technology, have delayed effect of development, can form industry and play a significant role to our province industry restructuring.The coordinated balance of energy retention, economy, environment, resource simultaneously.Be the direction promoted in world wide and develop, there is important social benefit and environmental benefit.
Summary of the invention
The technical problem to be solved in the present invention is: the solid solution treatment process providing a kind of raising 7022 aluminium alloy capabilities, to obtain 7022 more excellent aluminium alloys of performance.
Technical scheme of the present invention is: the solid solution treatment process of a kind of raising 7022 aluminium alloy capabilities, 7022 alloys are pressed composition Al-5.6Zn-2.5Mg-1.6Cu-0.23Cr and are prepared burden, wherein alloy element Zn, Mn, Cu, Mg, Cr adds with master alloy form, the smelting temperature of 7022 alloys controls at 700-740 DEG C, adopt the refining of 0.2%-0.4% hexachloroethane, pour in swage after leaving standstill 10-15min, first be incubated 24h at 462e, 470e is risen to again with the heat-up rate of 0.5e/h, then air cooling, ingot casting preheating temperature is 400-430 DEG C, crimp coefficient is 9, after carry out Intensive intervention: 466 DEG C insulation 2h after, 476e is warming up to again with 4e/h, room temperature shrend, T6 artificial aging is carried out immediately after quenching, namely 120 DEG C insulation 24h after and get final product.
Beneficial effect of the present invention: 7022 alloy solid solution tissues and mechanical property contrast by (1), as seen the mechanical property of this alloy and solid solution degree closely related.Thick Second Phase Particle dissolves in matrix completely, has both eliminated the fracture origin of big scale, too increases the quantity of precipitation strength phase simultaneously, and this must cause significantly improving of alloy mechanical property.(2) 7022 alloys are in when eutectic temperature in single phase solid solution district, its composition away from limit of solubility curved surface, therefore nonequilibrium solidification process formed eutectic comparatively small amt.After adopting reinforce extricating and strengthened solution, the breaking tenacity of 7022 alloys and yield strength all have raising by a relatively large margin, unit elongation still can be kept substantially constant, the raising of solid solution degree and the improvement of solid solution structure are the basic reasons improving mechanical property simultaneously.
Embodiment
Composition Al-5.6Zn-2.5Mg-1.6Cu-0.23Cr (massfraction, %) batching pressed by 7022 alloys.Wherein alloy element Zn, Mn, Cu, Mg, Cr add with master alloy form.The smelting temperature of 7022 alloys controls at 700 ~ 740 DEG C.Adopt 0.2%-0.4% hexachloroethane (C2Cl6) refining, pour in the swage of diameter 45mm after leaving standstill 10-15min.On traditional conventional uniform metallization processes basis, adopt reinforce extricating.For 7022 alloys, be first incubated 24h at 462e, then rise to 470e with the heat-up rate of 0.5e/h, then air cooling.Crimp is carried out on 500t press, and before extruding, ingot casting preheating temperature is 400-430 DEG C, and overflow mould diameter is 45mm, and extrusion nozzle diameter is 15mm, and deformation coefficient is 9, suitably controls extrusion speed to ensure the homogeneity of Deformation structure.
The Intensive intervention of crimp tissue and ageing treatment
Adopt conventional solid solution and Intensive intervention two kinds of resolving systems respectively.For 7022 alloys, conventional solid solution: 466 DEG C of insulation 2h; Intensive intervention: after 466 DEG C of insulation 2h, then be warming up to 476e with 4e/h, room temperature shrend.T6 artificial aging is carried out immediately, i.e. 120 DEG C of insulation 24h after quenching.
With the microstructure characteristic of timeliness again before and after observation by light microscope ingot homogenization and after As-extruded solid solution, and detect intensity and the unit elongation of alloy with Instron8032 universal electrical tensilometer.
All there is more thick second-phase in the intracrystalline of as cast condition 7022 alloy, grain boundaries, especially eutectic structure along grain boundaries continuous distribution.Cocrystalization compound is S (CuMgAl2) and T (AlZnMgCu) mutually.This eutectic phase has a strong impact on intensity and the plasticity of alloy.Through the long-time reinforce extricating process of high temperature, quantity, the size of second-phase reduce to some extent, but eutectic phase still partly can only dissolve in base.Strand after Homogenization Treatments, after hot extrusion deformation, adopts the solid solution condition process of 7022 alloy routines, still remains the thick second phase particles of part.This illustrates that the homogenizing of 7022 alloys under normal condition and solution treatment are halfway.On the basis of conventional solid solution process, progressively heat up solid solution, until exceed polyphase eutectic temperature (475 DEG C).In the alloy of intensification solid solution, the thick second-phase of the overwhelming majority has dissolved in A (Al) matrix, and without forming the sign of transition liquid-phase and burnt structure.This illustrates that traditional solid solubility temperature limit polyphase eutectic point can be broken through, and this is that the solid solution degree improving aluminium alloy eutectic phase provides simple and easy method.
(1) 7022 alloy solid solution tissues and mechanical property are contrasted, as seen the mechanical property of this alloy and solid solution degree closely related.Thick Second Phase Particle dissolves in matrix completely, has both eliminated the fracture origin of big scale, too increases the quantity of precipitation strength phase simultaneously, and this must cause significantly improving of alloy mechanical property.
(2) 7022 alloys are in when eutectic temperature in single phase solid solution district, its composition away from limit of solubility curved surface, therefore nonequilibrium solidification process formed eutectic comparatively small amt.
Claims (1)
1. one kind is improved the solid solution treatment process of 7022 aluminium alloy capabilities, it is characterized in that: 7022 alloys are prepared burden by composition Al-5.6Zn-2.5Mg-1.6Cu-0.23Cr, wherein alloy element Zn, Mn, Cu, Mg, Cr adds with master alloy form, the smelting temperature of 7022 alloys controls at 700-740 DEG C, adopt the refining of 0.2%-0.4% hexachloroethane, pour in swage after leaving standstill 10-15min, first be incubated 24h at 462e, 470e is risen to again with the heat-up rate of 0.5e/h, then air cooling, ingot casting preheating temperature is 400-430 DEG C, crimp coefficient is 9, after carry out Intensive intervention: 466 DEG C insulation 2h after, 476e is warming up to again with 4e/h, room temperature shrend, T6 artificial aging is carried out immediately after quenching, namely 120 DEG C insulation 24h after and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410287770.9A CN105316609A (en) | 2014-06-25 | 2014-06-25 | Solution treatment method for improving performance of 7022 aluminum alloy |
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| CN201410287770.9A CN105316609A (en) | 2014-06-25 | 2014-06-25 | Solution treatment method for improving performance of 7022 aluminum alloy |
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| CN105316609A true CN105316609A (en) | 2016-02-10 |
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| CN201410287770.9A Pending CN105316609A (en) | 2014-06-25 | 2014-06-25 | Solution treatment method for improving performance of 7022 aluminum alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110629084A (en) * | 2019-09-23 | 2019-12-31 | 山东南山铝业股份有限公司 | Preparation method and product of high-thermal-conductivity wrought aluminum alloy |
| CN111774429A (en) * | 2019-04-04 | 2020-10-16 | 西南铝业（集团）有限责任公司 | Production process of 7022 aluminum alloy extruded product |
-
2014
- 2014-06-25 CN CN201410287770.9A patent/CN105316609A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111774429A (en) * | 2019-04-04 | 2020-10-16 | 西南铝业（集团）有限责任公司 | Production process of 7022 aluminum alloy extruded product |
| CN110629084A (en) * | 2019-09-23 | 2019-12-31 | 山东南山铝业股份有限公司 | Preparation method and product of high-thermal-conductivity wrought aluminum alloy |
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Application publication date: 20160210 |
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