CN106834834B - A kind of use for electronic products high-strength aluminum alloy and preparation method thereof - Google Patents
A kind of use for electronic products high-strength aluminum alloy and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- 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
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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
A kind of use for electronic products high-strength aluminum alloy and preparation method thereof, the ingredient and mass percentage composition of the use for electronic products high-strength aluminum alloy are：Zn 6.0~6.5%, Mg 1.0~1.2%, Li 0.2~0.4%, Zr 0.01~0.015%, C 0.002~0.003%, Re 0.01~0.03%, Fe≤0.1%, surplus are Al and inevitable impurity, impurity is single≤and 0.05%, total amount≤0.15%.Use for electronic products high-strength aluminum alloy of the present invention has the characteristics that intensity is high, plasticity is good, heat-tinting function admirable, it is suitable for manufacturing the shell of the portable electronic products such as big screen intelligent mobile phone, tablet computer, laptop, has a vast market application prospect.
Description
Technical field
The invention belongs to technical field of aluminum alloy technology, it is specifically related to a kind of use for electronic products high-strength aluminum alloy and its preparation
Method.
Background technology
With the portable electronic products such as smart mobile phone, tablet computer, laptop screen enlarging and lightening development,
It is badly in need of the aluminum alloy casing of high intensity to improve resistance to compression, the bending resistance of fuselage, it is existing bending, bending etc. occurs to avoid fuselage
As.7000 line aluminium alloys belong to heat-treatable strengthened high-strength aluminum alloy, are currently used primarily in aerospace field, such as manufacture
Siding, bulkhead, spar, undercarriage of aircraft etc., therefore, 7000 line aluminium alloys are also known as aerolite.7000 line aluminium alloys
Main alloy element be Zn and Mg, Zn and Mg can also form that strengthen effect extremely notable other than with solution strengthening effect
MgZn2Mutually enhance the intensity of aluminium alloy.With the increase of Zn, Mg content, the intensity of 7000 line aluminium alloys also improves therewith, but
With the rising of intensity, the plasticity of alloy is begun to decline, and heat-tinting performance is also deteriorated therewith, and the color after oxidation becomes
It is grey, dimmed and lose metallic luster.Currently used 7000 line aluminium alloy, such as 7005,7050,7075, though there is intensity high
Feature, but its plasticity and heat-tinting performance are generally all poor, cannot be satisfied the high-decoration for taking formula electronic product to appearance member
It is required that.
Invention content
It is above-mentioned there are problem and shortage it is an object of the invention to be directed to, provide that a kind of intensity is high, plasticity is good, heat-tinting
Use for electronic products high-strength aluminum alloy of function admirable and preparation method thereof.
The technical proposal of the invention is realized in this way：
Use for electronic products high-strength aluminum alloy of the present invention, its main feature is that by following component and mass percent group
At：Zn 6.0~6.5%, Mg 1.0~1.2%, Li 0.2~0.4%, Zr 0.01~0.015%, C 0.002~0.003%, Re
0.01~0.03%, Fe≤0.1%, surplus are Al and inevitable impurity, impurity is single≤and 0.05%, total amount≤0.15%,
Described in Re at being grouped as and mass percent is：Pr 11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd
24.5%。
Preferably, use for electronic products high-strength aluminum alloy of the present invention, by following component and mass percentage composition：
Zn 6.3%, Mg 1.1%, Li 0.3%, Zr 0.015%, C 0.003%, Re 0.02%, Fe≤0.1%, surplus are Al and can not
The impurity avoided, impurity is single≤0.05%, total amount≤0.15%, wherein the Re at being grouped as and mass percent is：Pr
11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.
The preparation method of use for electronic products high-strength aluminum alloy of the present invention, its main feature is that including the following steps：
The first step：Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity is selected to be greater than or equal to 99.9% aluminium
Ingot, zinc ingot metal, magnesium ingot are as raw material；
Second step：Aluminium ingot is heated to fusing at 740~780 DEG C, and is added and accounts for the zinc that raw material total weight is 6.0~6.5%
Ingot, 1.0~1.2% magnesium ingot and 1~2% Al20Li alloys, stirring are fused into aluminum alloy melt；
Third walks：After aluminum alloy melt refining degasification slagging-off, it is 0.2~0.3% to add and account for raw material total weight
Al5Zr1C alloys and 0.01~0.03% mischmetal Re, stirring enable aluminum alloy to liquid ingredient it is uniform；
4th step：Aluminum alloy melt is cooled to 700~720 DEG C and stands 0.5~1 hour, is then cast as aluminium alloy；
5th step：By aluminium alloy in 490~500 DEG C of solution treatment 1~3 hour, after water quenching, at 120~130 DEG C of timeliness
Reason 15~18 hours, obtains use for electronic products high-strength aluminum alloy after furnace cooling.
Compared with prior art, the present invention haing the following advantages：
The room temperature tensile intensity of use for electronic products high-strength aluminum alloy of the present invention is more than 420MPa, and yield strength is more than
380MPa, elongation are more than 15%, and oxide thickness uniformly and bright in color, has that intensity is high, plasticity is good, heat-tinting performance
Excellent feature is suitable for manufacturing the outer of the portable electronic products such as big screen intelligent mobile phone, tablet computer, laptop
Shell has a vast market application prospect.
Specific implementation mode
To make the purpose of the present invention, technical solution and effect clearer, clear and definite, the present invention is made below further detailed
It describes in detail bright.
Use for electronic products high-strength aluminum alloy of the present invention, by following component and mass percentage composition：Zn 6.0
~6.5%, Mg 1.0~1.2%, Li 0.2~0.4%, Zr 0.01~0.015%, C 0.002~0.003%, Re 0.01~
0.03%, Fe≤0.1%, surplus are Al and inevitable impurity, impurity is single≤and 0.05%, total amount≤0.15%.
Preferably, the ingredient of the use for electronic products high-strength aluminum alloy and mass percentage composition are：Zn 6.3%, Mg
1.1%, Li 0.3%, Zr 0.015%, C 0.003%, Re 0.02%, Fe≤0.1%, surplus be Al and inevitable impurity,
Impurity is single≤and 0.05%, total amount≤0.15%.
The Re at being grouped as and mass percent is：Pr 11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd
24.5%。
Wherein, Zn and Mg is the main alloy element of use for electronic products high-strength aluminum alloy of the present invention, in addition to having solid solution
Outside invigoration effect, the two, which can also be formed, strengthens the extremely significant MgZn of effect2Phase is the primary strengthening phase of aluminium alloy.With Zn,
The intensity of the increase of Mg contents, aluminium alloy also improves therewith, but the moulding and heat-tinting performance of alloy can also decline therewith.For
Ensure that aluminium alloy has enough intensity, good plasticity and heat-tinting performance, therefore, the selection of Zn contents 6.0~
6.5%, Mg content are selected 1.0~1.2%, it is preferred that Zn contents are that 6.3%, Mg contents are 1.1%.
Li is most light metallic element, and Li is added in use for electronic products high-strength aluminum alloy, can reduce aluminium conjunction first
The density of gold, improves the specific strength and specific stiffness of aluminium alloy, reaches light-weighted effect.Followed by Li is in aluminium alloy ag(e)ing process
The Al of nano-scale can also be precipitated3Li and Al2MgLi hardening constituents, these hardening constituents can pinning dislocation, subgrain and crystal boundary, improve aluminium
The Li of the intensity and plastic deformation ability of alloy, addition 0.2~0.4% can generate significant effect to aluminium alloy, it is preferred that
Li additive amounts are 0.3%.
Zr, C are added in aluminium alloy in the form of Al5Zr1C alloys, and Al5Zr1C alloys are by potassium fluorozirconate and carbon dust
Mixture be obtained by the reaction with molten aluminum, inside contain a large amount of ZrC particles.Al5Zr1C alloys are that a kind of novel aluminium alloy is brilliant
Grain fining agent, inventor experimental results demonstrate, existing Al5Ti1B and Al5Ti1C alloys of Al5Zr1C alloy ratios have it is stronger
Grain refining capability, the Al5Zr1C alloys of addition 0.2~0.3% contain 0.01~0.015% Zr and 0.002 in aluminium alloy
~0.003% C, can significantly refining aluminum alloy crystal grain, improve the structural homogenity of aluminium alloy, improve aluminium alloy plasticity become
Shape ability, it is preferred that Al5Zr1C alloy addition levels are 0.3%, the C containing 0.015% Zr and 0.003% in aluminium alloy.
Re is the mischmetal containing Pr, Nd, Pm, Sm, Gd totally 5 kinds of light rare earth elements, the physical chemistry of light rare earth elements
Property is active, can be reacted with impurity elements such as hydrogen, oxygen, iron, silicon, manganese, copper, chromium in aluminum alloy melt and generate high-melting-point, high stable
Property rare earth compound, have deep purifying effect to aluminum alloy melt, impurity element can be eliminated to intensity of aluminum alloy and aoxidizing
The adverse effect of color performance increases thickness, uniformity and the brightness of oxidation film layer.The lot of experiments of inventor shows
Add that the effect containing Pr, Nd, Pm, Sm, Gd mixed light rare earth of totally 5 kinds of light rare earth elements is a kind of than addition or a few is light
The effect of rare earth element is all more preferable, therefore, the mixed light rare earth of selection addition 0.01~0.03%, it is preferred that mixed light rare earth adds
Dosage is 0.02%.
The present invention also provides the preparation methods of the use for electronic products high-strength aluminum alloy, specifically include following steps：
The first step：Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity is selected to be greater than or equal to 99.9% aluminium
Ingot, zinc ingot metal, magnesium ingot are as raw material；
Second step：Aluminium ingot is heated to fusing at 740~780 DEG C, and is added and accounts for the zinc that raw material total weight is 6.0~6.5%
Ingot, 1.0~1.2% magnesium ingot and 1~2% Al20Li alloys, stirring are fused into aluminum alloy melt；
Third walks：After aluminum alloy melt refining degasification slagging-off, it is 0.2~0.3% to add and account for raw material total weight
Al5Zr1C alloys and 0.01~0.03% mischmetal Re, stirring enable aluminum alloy to liquid ingredient it is uniform；
4th step：Aluminum alloy melt is cooled to 700~720 DEG C and stands 0.5~1 hour, is then cast as aluminium alloy；
5th step：By aluminium alloy in 490~500 DEG C of solution treatment 1~3 hour, after water quenching, at 120~130 DEG C of timeliness
Reason 15~18 hours, obtains use for electronic products high-strength aluminum alloy after furnace cooling.
The preparation method of the present invention, selects high-purity aluminium ingot, zinc ingot metal, magnesium ingot, Al20Li alloys, Al5Zr1C alloys and mixing
Rare earth Re is as raw material, and by optimizing the content of Zn, Mg main alloying element, addition Al20Li alloys carry out V-N steel,
After refined degasification, slagging-off, Al5Zr1C alloys and mischmetal are added, Al5Zr1C alloys can be given full play to and is mixed dilute
Soil acts on the crystal grain refinement and deep purifying of aluminum alloy melt, it is ensured that use for electronic products high-strength aluminum alloy of the present invention obtains high-strength
Degree, high-ductility and excellent heat-tinting performance.
In order to more describe use for electronic products high-strength aluminum alloy of the present invention and preparation method in detail, it is exemplified below several realities
Example is applied to be further described.
Embodiment 1：
Use for electronic products high-strength aluminum alloy of the present invention, by following component and mass percentage composition：Zn
6.0%, Mg 1.0%, Li 0.2%, Zr 0.01%, C 0.002%, Re 0.01%, Fe≤0.1%, surplus is for Al and unavoidably
Impurity, impurity is single≤0.05%, total amount≤0.15%, wherein the Re at being grouped as and mass percent is：Pr
11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.Preparation method comprises the steps of：
The first step：Select the aluminium ingot of Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity equal to 99.9%, zinc
Ingot, magnesium ingot are as raw material；
Second step：Aluminium ingot is heated to fusing at 740 DEG C, and is added and accounts for raw material total weight as 6.0% zinc ingot metal, 1% magnesium
Ingot and 1% Al20Li alloys, stirring be fused into aluminum alloy melt；
Third walks：After being removed the gred to aluminum alloy melt refining degasification with carbon trichloride, it is 0.2% to add and account for raw material total weight
Al5Zr1C alloys and 0.01% mischmetal Re, stirring enable aluminum alloy to liquid ingredient it is uniform；
4th step：Aluminum alloy melt is cooled to 700 DEG C and stands 1 hour, is then cast as aluminium alloy；
5th step：By aluminium alloy in 500 DEG C of solution treatment 1 hour, after water quenching, in 120 DEG C of ageing treatments 18 hours, with stove
Use for electronic products high-strength aluminum alloy is obtained after cooling.
Embodiment 2：
Use for electronic products high-strength aluminum alloy of the present invention, by following component and mass percentage composition：Zn
6.3%, Mg 1.1%, Li 0.3%, Zr 0.015%, C 0.003%, Re 0.02%, Fe≤0.1%, surplus is for Al and unavoidably
Impurity, impurity is single≤0.05%, total amount≤0.15%, wherein the Re at being grouped as and mass percent is：Pr
11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.Preparation method comprises the steps of：
The first step：Select the aluminium ingot of Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity equal to 99.95%, zinc
Ingot, magnesium ingot are as raw material；
Second step：Aluminium ingot is heated to fusing at 760 DEG C, and the zinc ingot metal, 1.1% for accounting for that raw material total weight is 6.3% is added
Magnesium ingot and 1.5% Al20Li alloys, stirring be fused into aluminum alloy melt；
Third walks：After being removed the gred to aluminum alloy melt refining degasification with carbon trichloride, it is 0.3% to add and account for raw material total weight
Al5Zr1C alloys and 0.02% mischmetal Re, stirring enable aluminum alloy to liquid ingredient it is uniform；
4th step：Aluminum alloy melt is cooled to 710 DEG C and stands 0.7 hour, is then cast as aluminium alloy；
5th step：By aluminium alloy in 495 DEG C of solution treatment 2 hours, after water quenching, in 125 DEG C of ageing treatments 16 hours, with stove
Use for electronic products high-strength aluminum alloy is obtained after cooling.
Embodiment 3：
Use for electronic products high-strength aluminum alloy of the present invention, by following component and mass percentage composition：Zn
6.5%, Mg 1.2%, Li 0.4%, Zr 0.015%, C 0.003%, Re 0.03%, Fe≤0.1%, surplus is for Al and unavoidably
Impurity, impurity is single≤0.05%, total amount≤0.15%, wherein the Re at being grouped as and mass percent is：Pr
11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.Preparation method comprises the steps of：
The first step：Select the aluminium ingot of Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity equal to 99.99%, zinc
Ingot, magnesium ingot are as raw material；
Second step：Aluminium ingot is heated to fusing at 780 DEG C, and the zinc ingot metal, 1.2% for accounting for that raw material total weight is 6.5% is added
Magnesium ingot and 2% Al20Li alloys, stirring be fused into aluminum alloy melt；
Third walks：After being removed the gred to aluminum alloy melt refining degasification with carbon trichloride, it is 0.3% to add and account for raw material total weight
Al5Zr1C alloys and 0.03% mischmetal Re, stirring enable aluminum alloy to liquid ingredient it is uniform；
4th step：Aluminum alloy melt is cooled to 720 DEG C and stands 0.5 hour, is then cast as aluminium alloy；
5th step：By aluminium alloy in 490 DEG C of solution treatment 3 hours, after water quenching, in 130 DEG C of ageing treatments 15 hours, with stove
Use for electronic products high-strength aluminum alloy is obtained after cooling.
By National Standard of the People's Republic of China GB/T16865-2013, by the use for electronic products high intensity of embodiment 1-3
Aluminium alloy is processed into standard tensile specimen, and room temperature tensile is carried out on DNS200 type electronic tensile test machines, and rate of extension is 2 millis
M/min, tensile mechanical properties are as shown in table 1.By the use for electronic products high-strength aluminum alloy of embodiment 1-3 sulfuric acid 80g/L,
Anodic oxidation is carried out under the conditions of citric acid 9g/L, lactic acid 7g/L, current density 1.5A/dm2, voltage 10V, oxidization time 30min
Processing, the results are shown in Table 1.
The tensile mechanical properties and oxidation susceptibility of 1 embodiment 1-3 use for electronic products high-strength aluminum alloys of table
| Embodiment sequence number | Tensile strength/MPa | Yield strength/MPa | Elongation/% | Oxidation film situation |
| Embodiment 1 | 420.4 | 382.8 | 17.1 | Uniformly, bright |
| Embodiment 2 | 447.1 | 401.3 | 16.5 | Uniformly, bright |
| Embodiment 3 | 461.4 | 425.4 | 15.7 | Uniformly, bright |
By the testing result of table 1 as it can be seen that the room temperature tensile intensity of use for electronic products high-strength aluminum alloy of the present invention is more than
420MPa, yield strength be more than 380MPa, elongation be more than 15%, anodic oxidation thickness uniformly and bright in color, have intensity
High, the characteristics of plasticity is good, heat-tinting function admirable, it is suitable for manufacturing big screen intelligent mobile phone, tablet computer, laptop
The shell of equal portable electronic products, has a vast market application prospect.
The present invention is described by embodiment, but is not limited the invention, with reference to description of the invention, institute
Other variations of disclosed embodiment, are such as readily apparent that the professional person of this field, such variation should belong to
Within the scope of the claims in the present invention limit.
Claims (1)
1. a kind of preparation method of use for electronic products high-strength aluminum alloy, it is characterised in that include the following steps：
The first step：Select the aluminium ingot of Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity more than or equal to 99.9%,
Zinc ingot metal, magnesium ingot as raw material, the Re at being grouped as and mass percent is：Pr 11.7%, Nd 24.2%, Pm
21.7%, Sm 17.9%, Gd 24.5%；
Second step：Aluminium ingot heats to fusing at 740~780 DEG C, and be added account for zinc ingot metal that raw material total weight is 6.0~6.5%,
1.0~1.2% magnesium ingot and 1~2% Al20Li alloys, stirring be fused into aluminum alloy melt；
Third walks：After aluminum alloy melt refining degasification slagging-off, adds and account for the Al5Zr1C that raw material total weight is 0.2~0.3%
Alloy and 0.01~0.03% mischmetal Re, stirring enable aluminum alloy to liquid ingredient it is uniform；
4th step：Aluminum alloy melt is cooled to 700~720 DEG C and stands 0.5~1 hour, is then cast as aluminium alloy；
5th step：By aluminium alloy in 490~500 DEG C of solution treatment 1~3 hour, after water quenching, in 120~130 DEG C of ageing treatments 15
~18 hours, use for electronic products high-strength aluminum alloy is obtained after furnace cooling, the high-strength aluminum alloy is by following component and matter
Measure percentage composition：Zn 6.0~6.5%, Mg 1.0~1.2%, Li 0.2~0.4%, Zr 0.01~0.015%, C
0.002~0.003%, Re 0.01~0.03%, Fe≤0.1%, surplus are Al and inevitable impurity, impurity is single≤
0.05%, total amount≤0.15%.
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| CN107447141B (en) * | 2017-08-10 | 2019-01-11 | 广东和胜工业铝材股份有限公司 | A kind of electronic product casing high-strength aluminum alloy and preparation method thereof |
| CN108048714A (en) * | 2017-12-27 | 2018-05-18 | 柳州智臻智能机械有限公司 | A kind of electronic product structural component aluminium alloy and preparation method thereof |
| CN108642348B (en) * | 2018-06-05 | 2020-06-16 | 湖南东方钪业股份有限公司 | Al-Zn-Mg series aluminum alloy section and preparation method thereof |
| CN108425041A (en) * | 2018-06-13 | 2018-08-21 | 合肥仁德电子科技有限公司 | A kind of aluminum alloy casing of electronic product |
| CN112481512B (en) * | 2020-10-20 | 2021-10-12 | 保定隆达铝业有限公司 | Method for treating yellowing of aluminum alloy ingot surface |
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| CN105220040A (en) * | 2015-11-19 | 2016-01-06 | 广东和胜工业铝材股份有限公司 | A kind of Al-Zn-Mg alloy and preparation method thereof and application |
| CN105483476A (en) * | 2016-01-27 | 2016-04-13 | 东莞佛亚铝业有限公司 | High-strength, high-conductivity and high-heat-resisting aluminum alloy and preparation method thereof |
| CN106222501A (en) * | 2016-08-26 | 2016-12-14 | 龙口市丛林铝材有限公司 | A kind of electronic product casing extruding aluminium alloy and manufacture method thereof |
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