CN107849648A - Aluminium alloy extruded product - Google Patents
Aluminium alloy extruded product Download PDFInfo
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- CN107849648A CN107849648A CN201680042816.8A CN201680042816A CN107849648A CN 107849648 A CN107849648 A CN 107849648A CN 201680042816 A CN201680042816 A CN 201680042816A CN 107849648 A CN107849648 A CN 107849648A
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- extruded product
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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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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
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- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The present invention provides a kind of outstanding aluminium alloy extruded product, and by carrying out machining to it and implementing anodized, can manufacture ensures high intensity and the excellent housing of aesthetic appearance.The aluminium alloy extruded product of the present invention, alloy contain Zn in forming：Mass %, Mg of 5.8 mass %~8.0：Mass %, Cu of 1.2 mass %~2.0：Mass %, Si of 0.4 mass %~1.2：Below 0.20 mass %, Fe：Below 0.20 mass %, Ti：0.01 mass %~0.1 mass %, Mn, Cr and Zr total amount are limited to below 0.10 mass %, and surplus is made up of Al and inevitable impurity, and whole cross section is made up of recrystallized structure.
Description
Technical field
The present invention relates to the housing of the miniaturized electronics such as the mobile terminals such as panel type terminal, mobile phone, digital camera to be made
7000 line aluminium alloy extrded materials and its correlation technique.
Background technology
Generally as material used in the housing of the miniaturized electronics such as panel type terminal, mobile phone, digital camera, it is necessary to
With good aesthetic appearance, and in order to lightweight, prevent from falling when etc. housing deformation or damaged it is necessary to have high intensity.
From such a viewpoint, these housings often use aluminium alloy, and in order to improve aesthetic appearance, generally surface is implemented at anodic oxidation
Reason.
Following patent documents 1~10 describe the aluminum alloy plate materials for belonging to various alloy systems, aluminium alloy extruded product, to table
Implement anodized and applied to the technology of various uses in face.
Among such a various alloy systems, the intensity of 7000 line aluminium alloys is high, thus be suitable as demand lightweight and
The material of the product of high intensity.Such as patent document 10 describes that superficial layer is recrystallized structure and inside is bacillar structure
7000 line aluminium alloy extrded materials intensity it is high, and anodized (Alumite) tone is also excellent.
Citation
Patent document 1：Japanese Unexamined Patent Publication 2012-246555 publications
Patent document 2：Japanese Unexamined Patent Publication 2009-209426 publications
Patent document 3：Japanese Unexamined Patent Publication 2006-52436 publications
Patent document 4：Japanese Unexamined Patent Publication 2006-26938 publications
Patent document 5：Japanese Unexamined Patent Publication 2004-137517 publications
Patent document 6：Japanese Unexamined Patent Publication 2001-115227 publications
Patent document 7：Japanese Unexamined Patent Publication 10-226857 publications
Patent document 8：Japanese Unexamined Patent Publication 9-184095 publications
Patent document 9：Japanese Unexamined Patent Publication 9-143602 publications
Patent document 10：Japanese Unexamined Patent Application 63-297543 publications
The content of the invention
On the other hand, as described above, the housing of panel type terminal, mobile phone, digital camera etc., except the robustness such as intensity with
Outside, good aesthetic appearance and accuracy be there is also a need for, such housing, will be whole for example by by the aluminium alloy machining of thick plate-like
Individual surface cut and be molded.
But housing is being molded to such forming method applied to above-mentioned 7000 line aluminium alloy extrded material, and
In the case of implementing anodized to the surface of the housing, part or all on surface can produce naked eyes and can observe
The striped color arrived is uneven (gloss deep or light), has and cannot get the high golden envelope of brightness, so as to cannot get good outward appearance
The problem of property etc.
Therefore, the tissue of entire surface in the section by making extrded material has been recorded in patent document 1 turns into recrystallization group
Knit, so as to which aesthetic appearance will not be damaged after machining, there is the alloy of high intensity.
But the housing of the miniaturized electronics as reality, in order to by matrix or other part screws and shell
Body is fixed, and the position for leaving screw etc. for is at least formed more than at one, and the housing with such position is being moistened in air
In environment in the case of use, can typically exist and 7000 problems for being the distinctive SCC of alloy etc occur.
The preferred embodiment of the present invention, be in view of above-mentioned and/or other problems in correlation technique and complete.This hair
Bright preferred embodiment can be obviously improved existing method and/or device.
The present invention be in view of above-mentioned problem and complete, its object is to, there is provided by carrying out machining and implementing sun
Pole oxidation processes, can make ensures high intensity and aesthetic appearance and the excellent miniaturized electronics of stress corrosion resistant cracking
Deng housing aluminium alloy extruded product and its correlation technique.
Other objects and advantages of the present invention, can be by following preferred embodiment and clear and definite.
To reach above-mentioned purpose, the present invention is using following technological maheup as purport.
[1] a kind of aluminium alloy extruded product, it is characterised in that contain Zn in alloy composition：The matter of 5.8 mass %~8.0
Measure %, Mg：Mass %, Cu of 1.2 mass %~2.0：Mass %, Si of 0.4 mass %~1.2：Below 0.20 mass %, Fe：
Below 0.20 mass %, Ti：0.01 mass %~0.1 mass %, Mn, Cr and Zr total amount are limited to below 0.10 mass %,
Surplus is made up of Al and inevitable impurity, also, whole cross section is made up of recrystallized structure.
[2] a kind of aluminium alloy extruded product, it is characterised in that obtained by following manner, for being made up of ingot bar
Extruding steel billet, as homogenize process condition 450 DEG C~520 DEG C keep 4h~30h homogenized, then with 200
DEG C/cooling of h~450 DEG C/h cooling velocity, the extruding that this is cooled is subjected to hot extrusion with heating steel billet to 450 DEG C~540 DEG C
Pressure, then the extrudate is cooled down with 100 DEG C/more than min cooling velocity, contained in the alloy composition of the extruding steel billet
There is Zn：Mass %, Mg of 5.8 mass %~8.0：Mass %, Cu of 1.2 mass %~2.0：Mass %, Si of 0.4 mass %~1.2：
Below 0.20 mass %, Fe：Below 0.20 mass %, Ti：0.01 mass %~0.1 mass %, Mn, Cr and Zr total amount limitation
For below 0.10 mass %, surplus is made up of Al and inevitable impurity.
[3] aluminium alloy extruded product according to preceding paragraph 1 or 2, the matter of 0.002 mass %~0.02 is contained in alloy composition
Measure % B.
[4] aluminium alloy extruded product according to any one of preceding paragraph 1~3, tensile strength 450N/mm2~600N/
mm2, endurance 400N/mm2~500N/mm2。
[5] aluminium alloy extruded product according to any one of preceding paragraph 1~4, the crystallization along in the section of the direction of extrusion
Particle diameter is 20 μm~400 μm.
[6] aluminium alloy extruded product according to any one of preceding paragraph 1~5, by surface by endurance 90%
In the case of in the chromic acid solution of the boiling of 95 DEG C~100 DEG C of the aluminium alloy extruded product input of strain, the rupture on surface
Time of origin is more than 40min, and the chromic acid solution, which has to 36g chromium oxide, 30g potassium bichromates, 3g sodium chloride, adds pure water
Concentration during 1L solution is made.
[7] a kind of Al-alloy casing, it is characterised in that be the aluminium alloy extruded product described in by any one of preceding paragraph 1~6
Machining applies for housing shape and to surface obtained from anodized.
[8] a kind of manufacture method of aluminium alloy extruded product, it is characterised in that extruded extruding, obtained with steel billet
The aluminium alloy extruded product that whole cross section is made up of recrystallized structure, the extruding steel billet alloy composition in contain Zn：5.8
Mass %, Mg of quality %~8.0：Mass %, Cu of 1.2 mass %~2.0：Mass %, Si of 0.4 mass %~1.2：0.20 matter
Measure below %, Fe：Below 0.20 mass %, Ti：0.01 mass %~0.1 mass %, Mn, Cr and Zr total amount are limited to 0.10
Below quality %, surplus are made up of Al and inevitable impurity.
[9] a kind of manufacture method of Al-alloy casing, it is characterised in that possess to obtain aluminium alloy extruded product process,
And obtain aluminium alloy by the aluminium alloy extruded product machining for housing shape and to surface implementation anodized
The process of housing, the aluminium alloy extruded product alloy composition in contain Zn：Mass %, Mg of 5.8 mass %~8.0：1.2 matter
Measure mass %, Cu of %~2.0：Mass %, Si of 0.4 mass %~1.2：Below 0.20 mass %, Fe：Below 0.20 mass %,
Ti：0.01 mass %~0.1 mass %, Mn, Cr and Zr total amount are limited to below 0.10 mass %, and surplus is by Al and can not keep away
The impurity exempted from is formed, also, whole cross section is made up of recrystallized structure.
[10] a kind of manufacture method of aluminium alloy extruded product, it is characterised in that for the extruding steel made of ingot bar
Base, 4h~30h is kept to be homogenized at 450 DEG C~520 DEG C as homogenize process condition, then with 200 DEG C/h~450
DEG C/cooling of h cooling velocity, the extruding that this is cooled is subjected to hot extrusion with heating steel billet to 450 DEG C~540 DEG C, then general
The extrudate is cooled down with 100 DEG C/more than min cooling velocity, so as to obtain aluminium alloy extruded product, the extruding steel billet
Alloy composition in contain Zn：Mass %, Mg of 5.8 mass %~8.0：Mass %, Cu of 1.2 mass %~2.0：0.4 mass %
~1.2 mass %, Si：Below 0.20 mass %, Fe：Below 0.20 mass %, Ti：0.01 mass %~0.1 mass %, Mn,
Cr and Zr total amount is limited to below 0.10 mass %, and surplus is made up of Al and inevitable impurity.
[11] manufacture method of the aluminium alloy extruded product according to preceding paragraph 10, it is real for the extrudate cooled
Apply temper.
[12] manufacture method of the aluminium alloy extruded product according to preceding paragraph 10 or 11, for the extrusion pressing type cooled
Material, with 450 DEG C~540 DEG C progress higher temperature solid solutions before temper is implemented.
[13] a kind of manufacture method of Al-alloy casing, it is characterised in that including following process：For made of ingot bar
Extruding steel billet, as homogenize process condition 450 DEG C~520 DEG C keep 4h~30h homogenized, with 200 DEG C/h~
450 DEG C/h cooling velocity cooling, carries out hot extrusion, then with heating steel billet by the extruding that this is cooled to 450 DEG C~540 DEG C
The extrudate is cooled down with 100 DEG C/more than min cooling velocity, so as to obtain the process of aluminium alloy extruded product；With by institute
Aluminium alloy extruded product machining is stated as housing shape and anodized is implemented to surface and obtains the work of Al-alloy casing
Sequence, the extruding steel billet alloy composition in contain Zn：Mass %, Mg of 5.8 mass %~8.0：The matter of 1.2 mass %~2.0
Measure %, Cu：Mass %, Si of 0.4 mass %~1.2：Below 0.20 mass %, Fe：Below 0.20 mass %, Ti：0.01 matter
Amount %~0.1 mass %, Mn, Cr and Zr total amount are limited to below 0.10 mass %, and surplus is by Al and inevitable impurity
Form.
According to the aluminium alloy extruded product of invention [1] [2], by carrying out machining and implementing anodized, energy
Enough make ensures high intensity and the housing of aesthetic appearance and the excellent miniaturized electronics of stress corrosion resistant cracking etc..
According to the aluminium alloy extruded product of invention [3], the effect above can be more effectively obtained.
According to the aluminium alloy extruded product of invention [4], intensity can be further improved.
According to the aluminium alloy extruded product of invention [5], the effect above further can be effectively obtained.
According to the aluminium alloy extruded product of invention [6], stress corrosion resistant cracking can be further improved.
According to the Al-alloy casing of invention [7], on the basis of possessing high intensity, it is also equipped with excellent aesthetic appearance and resists to answer
Power corrosion cracking.
According to invention [8]~[12] manufacture method, using the teaching of the invention it is possible to provide can make ensure high intensity and aesthetic appearance and resist answer
The aluminium alloy extruded product of the housing of the excellent miniaturized electronics of power corrosion cracking etc..
According to the manufacture method of invention [13], using the teaching of the invention it is possible to provide ensure high intensity and aesthetic appearance and stress corrosion resistant are cracked
The Al-alloy casing of the excellent miniaturized electronics of property etc..
Brief description of the drawings
Fig. 1 is microcosmic in the section parallel with the direction of extrusion for test material as related embodiment of the invention
The optical microscope photograph of tissue, figure (a) are the photos of skin section, and figure (b) is internal photo.
Embodiment
Hereinafter, the composition of 7000 related line aluminium alloy extrded materials of the invention is described in detail.
The aluminium alloy extruded product of the present invention, its alloy structure contain Zn：Mass %, Mg of 5.8 mass %~8.0：1.2 matter
Measure mass %, Cu of %~2.0：Mass %, Si of 0.4 mass %~1.2：Below 0.20 mass %, Fe：Below 0.20 mass %,
Ti：0.01 mass %~0.1 mass %, Mn, Cr and Zr total amount are limited to below 0.10 mass %, and surplus is by Al and can not keep away
The impurity exempted from is formed.
In the alloy structure, Zn be in order to ensure heat treatment after intensity and add, it is necessary to add 5.8 mass % with
On.But if Zn content can reduce more than 8.0 mass %, Squeezing ground.Therefore, Zn contents need for 5.8 mass %~
8.0 mass %, it is preferably set to the mass % of 5.9 mass %~7.6.
Mg and Zn added also for the intensity after ensuring heat treatment, it is necessary to add more than 1.2 mass %.But
It is, if Mg content can reduce more than 2.0 mass %, Squeezing ground, thus it is not preferred.Therefore, Mg contents are needed for 1.2 matter
Measure the mass % of %~2.0.
Ti is added for the miniaturization of ingot bar tissue.If Ti contents are less than 0.01 mass %, miniaturization
Effect is insufficient, if greater than 0.1 mass %, then saturation can occur, it is possible to crystallize out huge compound.Therefore, Ti contains
Amount is needed for the mass % of 0.01 mass %~0.1.
Typically in 7000 line aluminium alloy extrded materials, in order to improve stress corrosion resistant cracking and intensity, Mn, Cr, Zr
Mass % of 0.15 mass % of addition total etc. transition elements~0.5 or so, is thus formed in the threadiness stretched in the direction of extrusion
Tissue.But if implementing anodized to whole cross section for the surface of the extrded material of bacillar structure, it can occur
Anodized envelope produces striped color inequality etc the problem of.
Furthermore in above-mentioned conventional patent document 10, by adding the Cr and Zr of scheduled volume to alloy, and before extrusion
Special heat treatment is added afterwards, only by the Surface Recrystallization of extrded material, thus prevents the irregular colour of anodic oxidation coating.
But if it is housing that such extrded material is molded by machining, bacillar structure can be on the surface of housing
Part or all exposes, therefore when implementing anodized to the housing, as described above, still can be at anodic oxidation
Manage envelope and produce irregular colour, thus it is not preferred.
Therefore in the present invention, Mn, Cr and Zr for containing as inevitable impurity total content are limited to
Below 0.10 mass %, makes the whole cross section of extrded material be made up of recrystallized structure.Like this if whole cross section is to tie again
Crystalline substance tissue, then in the case that extrded material machining is shaped into housing, the whole surface of housing is recrystallization
Tissue, when implementing anodized on the surface to the housing, it can prevent anodized envelope from producing irregular colour.
Recrystallized structure in the present invention refers to that the crystallization particle diameter in the section parallel with the direction of extrusion is 20 μm~400 μm
Tissue, be by the tissue that forms of crystal grain that average aspect ratio is less than 5.0.Average aspect ratio in the present invention, with extruding
In the parallel section in direction, the average crystallite particle diameter determined in the direction of extrusion is set to " a ", by what is determined on thickness of slab direction
When average crystallite particle diameter is set to " b ", represented by " a/b " or " b/a ".For example suitably selected skin section of the measure of average aspect ratio,
1/2 thickness of slab portion (inside) so represents multiple regions in section, when average aspect ratio is less than 5.0 in Zone Full, definition
Whole cross section is recrystallized structure.Average aspect ratio is less than 3.0 more preferably in Zone Full in the present invention.It is furthermore average
Crystallization particle diameter measure can based on JISH0501 the process of chopping carry out.
Cu is added to improve intensity, it is necessary to add more than 0.4 mass %.If Cu contents are less than 0.4 matter
% is measured, then can not expect intensity increase.I.e. if less than 0.4 mass %, then the crystal boundary in material without precipitate band (PFZ)
Width increases, and its result can substantially damage stress corrosion resistant cracking, therefore can not expect intensity increase.On the other hand, if
For Cu contents more than 1.2 mass %, then being not only due to the increase of deformation drag of the extrded material in hot-working causes infringement to extrude
Property, it is also easy to product is cracked.Therefore, Cu contents need to be limited to below 1.2 mass %.
In the aluminium alloy extruded product of the present invention, in order to embody crystal grain micronized effect, preferably add Ti contents 1/5 is left
The B of right content.Specifically, the mass % of 0.002 mass %~0.02 B is preferably comprised.I.e. B content is less than 0.002 matter
In the case of measuring %, it cannot get crystal grain micronized effect, thus it is not preferred.In the case that B content is more than 0.02 mass %,
The thick TiB based compounds formed during casting, which are possible to remain, turns into the starting point destroyed in material after extrusion, thus unexcellent
Choosing.
In the aluminium alloy extruded product of present embodiment, on Fe, Si, other inevitable impurity elements, as long as
Amount contained by 7000 usually used line aluminium alloys, then will not be to intensity, the reduction of stress corrosion resistant cracking and anodic oxygen
Change the especially bad influences of generation such as tone, the irregular colour of processing envelope.
In the present invention, such as by using known method the ingot bar for carrying out founding and making above-mentioned alloy composition (squeezes
Pressure steel billet), after carrying out homogenize process with steel billet to the extruding, cooled down.
Homogenize process is to reduce the microsegregation occurred in casting and promote the essential elements such as Zn, Mg, Cu
The processing of solid solution.In the homogenize process, in the case that homogenize process temperature is less than 450 DEG C, the solid solution of solute element is entered
Row is insufficient, therefore can not ensure required intensity sometimes, thus not preferred.In addition, if the temperature homogeneous of the progress more than 520 DEG C
Change is handled, then extruding is possible to local melting with steel billet, thus not preferred.Therefore it is preferably set to as homogenize process temperature
450 DEG C~520 DEG C.In addition, if the retention time of homogenize process is less than 4h (hour), then homogenizing in extruding steel billet
Carry out it is insufficient, if the opposite retention time exceed 30h, productivity ratio reduction.Therefore, the retention time be preferably set to 4h~
30h, more preferably it is set as 6h~24h.
In the cooling treatment that the extruding after to homogenize process is carried out with steel billet, cooling velocity needs to be set as, does not lead
The element for causing to be dissolved in homogenize process is as the thick speed for separating out, making intensity decreases of intermetallic compound.In the present invention,
Generally preferably carried out with 200 DEG C/h~450 DEG C/h, be more preferably set as 250 DEG C/h~350 DEG C/h.
In the present invention, for the above-mentioned extruding steel billet cooled, the extrudate is cooled down after hot extrusion, thus
To the 7000 line aluminium alloy extrded materials of the present invention.Or the extrudate to being cooled after extruding, high temperature is carried out as needed
After solution treatment, the tempers such as artificial aging processing, natural aging treatment are carried out, thus obtain the present invention 7000 are aluminium
Alloy extrusion material.
When carrying out hot extrusion, if not by extruding heating steel billet to more than 400 DEG C of temperature during extruding, it is likely that
It is more than 500 DEG C that the section bar temperature after just extruding, which can not be ensured, so as to ensure in order to not by the water cooling after extruding, fan
Air cools down the die quenching carried out and forms the intensity needed for supersaturated solid solution.
In addition, if the section bar temperature of extrudate is more than 550 DEG C, it is likely that surface of extruded profiles produce it is raised,
The defects of defect.
Therefore, extruding is preferably controlled to more than 400 DEG C with the heating-up temperature of steel billet, to cause the section bar temperature after just extruding
As 470 DEG C~550 DEG C of scope.Cooling after extruding is carried out as described above by die quenching, but if cold after extruding
But speed is less than 100 DEG C/min, then can not ensure required intensity.
Therefore, in the die quenching that water cooling or fan air cooling are carried out after extrusion, cooling velocity is preferably controlled to 100
DEG C/more than min.In addition in this case, in order to obtain predetermined intensity, can use the extrudate after extruding temporarily in height
Temperature is lower to be dissolved, the method cooled down at a predetermined rate.
Carry out the temper (T5 outputs) such as artificial aging processing for the extrudate after cooling, or for cooling after
Extrudate solution treatment is carried out with 450 DEG C~540 DEG C of high temperature after carry out artificial aging processing and natural aging treatment again
It is 450N/mm thus, it is possible to effectively obtain tensile strength etc. temper (T6 processing, T7 processing)2~600N/mm2, endurance
For 400N/mm2~500N/mm2High intensity aluminium alloy extruded product.
In addition, by the way that surface is put into 95 DEG C~100 DEG C by the aluminium alloy extruded product of 90% strain of endurance
In the chromic acid solution of boiling (concentration when being made 1L solution to 36g chromium oxide, 30g potassium bichromates, 3g sodium chloride addition pure water
Chromic acid solution), rupture time of origin (the SCC time as surface；SCC be cracked the time) can obtain 40min with
On, stress corrosion resistant cracking can be significantly improved.
The aluminium alloy extruded product of the invention so obtained, such as it is used as panel type terminal, mobile phone, digital camera etc.
The shell body material of miniaturized electronics.I.e., the aluminium alloy extruded product of the present invention is shaped to housing by machining
Shape, envelope is formed by anodized to the housing shape products formed, so as to obtain housing.
The tone of the anodized envelope of housing is formed in the present invention, the Hunter aberration recorded by JISZ8730 is public
The brightness index L* (L* values) that formula obtains is represented (referring for example to patent document 4,5 etc.).Furthermore L* values are the upper limit with 100,
Numerical value is higher to represent brighter tone.
It is golden for target with what is become clear as the tone of anodized envelope in housing of the present invention, if
It is represented then as 65 ＜ L* ＜ 95 with above-mentioned L*.The tone can pass through alloy composition and crystalline structure with the present invention
7000 line aluminium alloy extrded materials and obtain.
In addition, the golden concentration of anodized envelope can change according to thickness, in housing of the present invention,
It it is preferably 3~30 μm by film thickness.I.e., anodized envelope is more thin cheaper, but sometimes cannot be sufficiently golden, and
And if less than 3 μm, then it is difficult to stabilization and forms anodized envelope.On the other hand, the thickness of anodized envelope
If it exceeds 30 μm, then cost increases, and in deformation, envelope easily cracks, in addition anodized envelope
Gold can become overrich, cannot get the above-mentioned bright gold close to white.
Embodiment
Below, related embodiment of the invention and the comparative example compared with it are illustrated.
(1) the 1st embodiment
First, the aluminium alloy for having the composition shown in alloy No.1~12 of table 1 below using usual way melting is cast
Block.Mn, Cr, Zr as inevitable impurity it is micro containing.
Furthermore alloy No.1~6 are the alloy compositions (alloying component) present invention provide that contained in scope in table 1, alloy
No.7~12 are to depart from the alloy composition present invention provide that scope.Specifically, Cu contents depart from the present invention in alloy No.7,8
Prescribed limit, Mg contents depart from the prescribed limit of the present invention in alloy No.9,10, and Zn contents depart from this in alloy No.11,12
The prescribed limit of invention.
Implement the 470 DEG C × 6h place that homogenizes to extruding steel billet made of the aluminium alloy ingot bar that is made up of above-mentioned each alloy
After reason, by each extruding with steel billet using heating-up temperature be 470 DEG C, condition of the extrusion speed as 8m/min carry out extrusion process, obtain
To extrudate.And then each extrudate is cooled down (cooling velocity is about 150 DEG C/min) by fan air after firm extruding
Cooled down, obtain wall thickness 4mm × width 110mm extrudate (stripper plate).Then, with 70 DEG C × 5h → 130 DEG C × 8h
Condition implement high-temperature aging processing.
Extrded material using each alloy so obtained composition implements microstructure observation, below as test material is supplied
State the average aspect ratio of program determination crystal grain.Its result is shown in table 1 in the lump.
＜ average aspect ratios ＞
As the region of measure average aspect ratio, the skin section in the selected section parallel with the direction of extrusion, inside (1/2t：
1/2 part of thickness of slab), the average knot of the process of chopping measure direction of extrusion and thickness of slab direction in each region based on JISH0501
Crystal size, " a " is set to by the average crystallite particle diameter of the direction of extrusion, and the average crystallite particle diameter in thickness of slab direction is set into " b ", will be average
Aspect ratio is obtained as " a/b " or " b/a ".On the measurement range of average aspect ratio, skin section, inside all determine thickness of slab side
1000 μm of scope in the upward 500 μ m direction of extrusion.The section of the alloy No.4 microstructure for test material is shown in
Fig. 1.The section that (a) is skin section is schemed in the figure, figure (b) is internal section.Furthermore supply experiment in addition to alloy No.4
In material, the microstructure substantially same with alloy No.4 microstructure has also been obtained.
Table 1
(2) the 2nd embodiments
As described in Table 2, the confession test material of embodiment 1~7 and comparative example 1~11 is obtained.Such as in embodiment 1,
To the ingot bar (extruding steel billet) of the alloy composition with alloy No.1, after the homogenize process for implementing 465 DEG C × 6h, to each
Extruding carries out extrusion process with steel billet in the same manner as above-mentioned 1st embodiment, obtains the extrudate that section bar temperature is 525 DEG C.Enter
And each extrudate is cooled down into (cooling velocity is about 244 DEG C/min) by fan air after firm extruding and cooled down, obtain
The extrudate same with above-mentioned 1st embodiment.Then, high temperature is implemented in the same manner as above-mentioned 1st embodiment to the extrudate
Ageing Treatment, obtain embodiment 1 supplies test material.
In embodiment 2~7 and comparative example 1~11, all respectively obtained with the condition shown in table 2 for test material.In table 2
The condition do not recorded is same as Example 1.
Furthermore embodiment 7 is the confession substantially same with embodiment 1 in addition to the cooling after being extruded by water cooling
Test material.It is in addition to homogenization temperature is higher or lower than preferred scope (450 DEG C~520 DEG C), with reality in comparative example 7,8
The substantially same confession test material of example 4 is applied, comparative example 9,10 is except section bar temperature is higher or lower than preferred scope after extruding
Beyond (470 DEG C~550 DEG C), substantially same with embodiment 4 supplies test material, and comparative example 11 is except cooling velocity after extruding
Beyond slower than preferred value (100 DEG C/more than min), substantially same with embodiment 4 supplies test material.
Test material is respectively supplied for the embodiment 1~7 that so obtains and comparative example 1~11, implements to draw with following programs
Experiment and anodized are stretched, and the measure of tone and the evaluation of irregular colour are carried out to anodized envelope.Will
Its result is shown in table 2 in the lump.
＜ tension tests and SCC time (SCC is cracked the time) ＞
Tension test sheet (supplying test material) takes JIS5 test film to be drawn on the direction parallel with the direction of extrusion
Stretch experiment, measure tensile strength (σ B) and endurance (σ 0.2).It is 450N/mm by tensile strength (σ B) as evaluation method2~
600N/mm2, endurance (σ 0.2) be 400N/mm2~500N/mm2It is qualified to be determined as.In addition, determining tensile stress acts on confession
Time of the test material untill being cracked (SCC is cracked the time).
＜ anodizeds ＞
Milling Process is carried out to each surface for test material, as pretreatment in the hydrogen that concentration is 5%, liquid temperature is 60 DEG C
After being impregnated 1 minute in aqueous solution of sodium oxide, impregnated 1 minute in the aqueous solution of nitric acid that concentration is 30%, liquid temperature is 20 DEG C.So
Afterwards, impregnated in the aqueous sulfuric acid that concentration is 15%, liquid temperature is 20 DEG C, apply 10 minutes 2.0A/dm2Extra current, it is right
Surface after Milling Process carries out anodized.Then, as sealing pores, in the vinegar that concentration is 5%, liquid temperature is 90 DEG C
Impregnated 20 minutes in the sour Ni aqueous solution.The thickness of anodic oxidation coating is 10 μm.
The measure ＞ of ＜ tones
The tone for respectively supplying test material after anodized, as described above, on the basis of JISZ8730 regulation, makes
With colour difference meter, L* values are determined by SCI modes (normal reflection light injects mode).
The evaluation ＞ of ＜ irregular colours
On the evaluation of irregular colour, evaluated by estimating with "○" " △ " "×" three phases."○" is not have
Irregular colour, " △ " are somewhat irregular colour, and "×" is irregular colour, and "○" " △ " is qualified.
Table 2
＜ overall merits ＞
As shown in Table 2, test material is supplied shown in embodiment 1~7, i.e. alloy composition meets the regulation of the present invention, entirely
Section is made up of recrystallized structure, and homogenize process temperature, extruding after section bar temperature and extruding after cooling velocity preferred
In the range of supply test material, intensity is high, the tone (L*) of SCC cracking long lifespans and surface oxidation treatment envelope is before
It is brighter gold in the target zone of record.Furthermore the intensity of embodiment 2 (alloy No.2) is high among embodiment, slightly
It is microcosmic to observe irregular colour.It is thought that due to Cu contents in prescribed limit it is higher.
On the other hand, alloy composition is unsatisfactory for the confession test material (alloy of the embodiment 1~6 of the prescribed limit of the present invention
No.7~12), compared with embodiment 1~7, when can not have intensity (being calculated as more than 400MPa with endurance) and SCC experiment crackings concurrently
Between (more than 40min).In addition, as comparative example 7~11 accordingly even when alloy composition meets the prescribed limit (alloy of the present invention
No.4), but homogenize process temperature, extruding after section bar temperature and extruding after cooling velocity outside preferred scope for experiment material
Material, it is same with above-mentioned comparative example 1~6, it can not also have intensity (more than 400MPa is calculated as with endurance) and SCC experiment cracking times concurrently
(more than 40min).
The application is willing to that No. 2015-198624 claims priority based on the Japanese patent application laid that on October 6th, 2015 proposes,
The disclosure of which forms the part of the application as former state.
It should be appreciated that term used herein above and statement are only intended to illustrate, it is not used to restrictively explain,
It is not excluded for being equal to item with any of feature item for being shown in which and describing, it is allowed in scope of the presently claimed invention
Various modifications.
The present invention can be embodied with multiple different shapes, its open implementation that should be considered as providing the principle of the present invention
Example, these embodiments are not intended to limit the invention to the preferred embodiment recorded and/or illustrated herein, under the premise of being somebody's turn to do,
Multiple illustrated embodiments are described herein.
Describe several illustrated embodiments of the invention herein, but the present invention be not limited to record herein it is various excellent
Embodiment is selected, equivalent key element, modification, deletion, the group that can also expect including those skilled in the art based on the disclosure
All embodiments for close (such as combining the characteristics span in various embodiments), improving and/or changing.Claim
Limiting item should be construed broadly as based on the term used in the claim, should not be limited to this specification or this Shen
The embodiment described in example please, such embodiment should be interpreted nonexcludability.It is not intended to limit the present invention
Due to the preferred embodiment recorded and/or illustrated herein, under the premise of being somebody's turn to do, multiple illustrated embodiments are described herein
Describe several illustrated embodiments of the invention herein, but the present invention be not limited to record herein it is various excellent
Embodiment is selected, equivalent key element, modification, deletion, the group that can also expect including those skilled in the art based on the disclosure
All embodiments for close (such as combining the characteristics span in various embodiments), improving and/or changing.Claim
Limiting item should be construed broadly as based on the term used in the claim, should not be limited to this specification or this Shen
The embodiment described in example please, such embodiment should be interpreted nonexcludability.
Industry utilizability
The aluminium alloy extruded product of the present invention, can function well as the small electricals such as panel type terminal, mobile phone, digital camera
The material of the housing of sub- equipment.
Claims (13)
1. a kind of aluminium alloy extruded product, it is characterised in that contain in alloy composition：
Zn：The mass % of 5.8 mass %~8.0,
Mg：The mass % of 1.2 mass %~2.0,
Cu：The mass % of 0.4 mass %~1.2,
Si：Below 0.20 mass %,
Fe：Below 0.20 mass %,
Ti：The mass % of 0.01 mass %~0.1,
Mn, Cr and Zr total amount are limited to below 0.10 mass %,
Surplus is made up of Al and inevitable impurity,
Also, whole cross section is made up of recrystallized structure.
A kind of 2. aluminium alloy extruded product, it is characterised in that obtained by following manner,
For the extruding steel billet made of ingot bar, 4 hours~30 are kept at 450 DEG C~520 DEG C as homogenize process condition
Hour is homogenized, and is then cooled down with 200 DEG C/h~450 DEG C/h of cooling velocity, and the extruding that this is cooled is used
Heating steel billet is then cold with more than 100 DEG C/min of cooling velocity by the extrudate to 450 DEG C~540 DEG C progress hot extrusions
But,
Contain in the alloy composition of the extruding steel billet：
Zn：The mass % of 5.8 mass %~8.0,
Mg：The mass % of 1.2 mass %~2.0,
Cu：The mass % of 0.4 mass %~1.2,
Si：Below 0.20 mass %,
Fe：Below 0.20 mass %,
Ti：The mass % of 0.01 mass %~0.1,
Mn, Cr and Zr total amount are limited to below 0.10 mass %,
Surplus is made up of Al and inevitable impurity.
3. aluminium alloy extruded product according to claim 1 or 2,
Alloy composition in containing 0.002 mass %~0.02 mass % B.
4. the aluminium alloy extruded product according to any one of claims 1 to 3,
Tensile strength is 450N/mm2~600N/mm2, endurance 400N/mm2~500N/mm2。
5. the aluminium alloy extruded product according to any one of Claims 1 to 4,
It it is 20 μm~400 μm along the crystallization particle diameter in the section of the direction of extrusion.
6. the aluminium alloy extruded product according to any one of Claims 1 to 5,
In the chromium for the boiling that surface is put into 95 DEG C~100 DEG C by the aluminium alloy extruded product of 90% strain of endurance
In the case of in acid solution, the cracking time of origin on surface is more than 40 minutes, the chromic acid solution have to 36g chromium oxide,
30g potassium bichromates, 3g sodium chloride add concentration when 1L solution is made in pure water.
7. a kind of Al-alloy casing, it is characterised in that be by the aluminium alloy extruded product described in any one of claim 1~6
Machining applies for housing shape and to surface obtained from anodized.
8. a kind of manufacture method of aluminium alloy extruded product, it is characterised in that extruded with steel billet extruding, entirely cut
The aluminium alloy extruded product that face is made up of recrystallized structure,
Contain in the alloy composition of the extruding steel billet：
Zn：The mass % of 5.8 mass %~8.0,
Mg：The mass % of 1.2 mass %~2.0,
Cu：The mass % of 0.4 mass %~1.2,
Si：Below 0.20 mass %,
Fe：Below 0.20 mass %,
Ti：The mass % of 0.01 mass %~0.1,
Mn, Cr and Zr total amount are limited to below 0.10 mass %,
Surplus is made up of Al and inevitable impurity.
9. a kind of manufacture method of Al-alloy casing, it is characterised in that possess the process for obtaining aluminium alloy extruded product and incite somebody to action
The aluminium alloy extruded product machining obtains Al-alloy casing for housing shape and to surface implementation anodized
Process,
Contain in the alloy composition of the aluminium alloy extruded product：
Zn：The mass % of 5.8 mass %~8.0,
Mg：The mass % of 1.2 mass %~2.0,
Cu：The mass % of 0.4 mass %~1.2,
Si：Below 0.20 mass %,
Fe：Below 0.20 mass %,
Ti：The mass % of 0.01 mass %~0.1,
Mn, Cr and Zr total amount are limited to below 0.10 mass %,
Surplus is made up of Al and inevitable impurity,
Also, whole cross section is made up of recrystallized structure.
A kind of 10. manufacture method of aluminium alloy extruded product, it is characterised in that
For the extruding steel billet made of ingot bar, 4 hours~30 are kept at 450 DEG C~520 DEG C as homogenize process condition
Hour carries out homogenize process, is then cooled down with 200 DEG C/h~450 DEG C/h of cooling velocity, is squeezed what this was cooled
Pressure carries out hot extrusion with heating steel billet to 450 DEG C~540 DEG C, then by the extrudate with more than 100 DEG C/min of cooling speed
Degree cooling, so as to obtain aluminium alloy extruded product,
Contain in the alloy composition of the extruding steel billet：
Zn：The mass % of 5.8 mass %~8.0,
Mg：The mass % of 1.2 mass %~2.0,
Cu：The mass % of 0.4 mass %~1.2,
Si：Below 0.20 mass %,
Fe：Below 0.20 mass %,
Ti：The mass % of 0.01 mass %~0.1,
Mn, Cr and Zr total amount are limited to below 0.10 mass %,
Surplus is made up of Al and inevitable impurity.
11. the manufacture method of aluminium alloy extruded product according to claim 10,
For the extrudate cooled, implement temper.
12. the manufacture method of the aluminium alloy extruded product according to claim 10 or 11,
For the extrudate cooled, with 450 DEG C~540 DEG C progress higher temperature solid solutions before temper is implemented.
13. a kind of manufacture method of Al-alloy casing, it is characterised in that including following process：
For the extruding steel billet made of ingot bar, 4 hours~30 are kept at 450 DEG C~520 DEG C as homogenize process condition
Hour carries out homogenize process, is then cooled down with 200 DEG C/h~450 DEG C/h of cooling velocity, is squeezed what this was cooled
Pressure carries out hot extrusion with heating steel billet to 450 DEG C~540 DEG C, then by the extrudate with more than 100 DEG C/min of cooling speed
Degree cooling, so as to obtain the process of aluminium alloy extruded product；With
Aluminium alloy is obtained by the aluminium alloy extruded product machining for housing shape and to surface implementation anodized
The process of housing,
Contain in the alloy composition of the extruding steel billet：
Zn：The mass % of 5.8 mass %~8.0,
Mg：The mass % of 1.2 mass %~2.0,
Cu：The mass % of 0.4 mass %~1.2,
Si：Below 0.20 mass %,
Fe：Below 0.20 mass %,
Ti：The mass % of 0.01 mass %~0.1,
Mn, Cr and Zr total amount are limited to below 0.10 mass %,
Surplus is made up of Al and inevitable impurity.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-198624 | 2015-10-06 | ||
| JP2015198624A JP6690914B2 (en) | 2015-10-06 | 2015-10-06 | Aluminum alloy extruded material |
| PCT/JP2016/076324 WO2017061224A1 (en) | 2015-10-06 | 2016-09-07 | Aluminum alloy extruded material |
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| CN107849648A true CN107849648A (en) | 2018-03-27 |
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| JP (1) | JP6690914B2 (en) |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108707941A (en) * | 2018-05-29 | 2018-10-26 | 西安易朴通讯技术有限公司 | Anode oxide film and preparation method thereof and Al-alloy casing, mobile phone containing it |
| CN109136689A (en) * | 2018-10-22 | 2019-01-04 | 广西平果百矿高新铝业有限公司 | A kind of Al-Zn-Mg-Cu ultra-high-strength aluminum alloy and its crushing failure at high speed press quenching production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3605631B1 (en) | 2017-03-31 | 2021-02-24 | FUJIFILM Corporation | Organic semiconductor element, organic semiconductor composition, method of manufacturing organic semiconductor film, organic semiconductor film, and compound and polymer using the same |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2017061224A1 (en) | 2017-04-13 |
| JP2017071818A (en) | 2017-04-13 |
| JP6690914B2 (en) | 2020-04-28 |
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