CN110964958A - Al-Zn-Mg-Cu alloy and preparation process thereof - Google Patents
Al-Zn-Mg-Cu alloy and preparation process thereof Download PDFInfo
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- 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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- 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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Abstract
The embodiment of the invention provides an Al-Zn-Mg-Cu alloy and a preparation process thereof, wherein the tensile strength sigma b of the alloy in a T6 state is more than or equal to 590MPa, the yield strength sigma 0.2 is more than or equal to 560MPa, the elongation delta after fracture is more than or equal to 12%, the alloy has high strength, simultaneously has excellent anodic oxidation performance, has an oxide film without continuous cracks, and is suitable for being used as a shell or frame structure material of portable electronic equipment.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy, and particularly relates to an Al-Zn-Mg-Cu alloy and a preparation process thereof.
Background
On one hand, aluminum alloy with good mechanical property can be obtained by adding different alloy elements into aluminum and performing a series of processing and heat treatment; on the other hand, the aluminum alloy can be recycled and has good processing performance. Due to the advantages of the two aspects, the aluminum alloy is widely applied to the manufacturing of various products.
In the aspect of mobile phones, as the screen occupation ratio of a mobile phone screen is getting larger and larger, in order to better protect a large-size screen, higher requirements are provided for the strength and the processing performance of the aluminum alloy material for the frame. The mechanical property of the existing mature 6 series aluminum alloy can only reach the level of 400 MPa. If alloy elements are continuously added for strengthening, the strength cannot be continuously improved due to the inherent solid solubility of each element in aluminum, and the increase of the alloy elements can influence the anodic oxidation effect on the contrary, so that the anode is numb and dull after being oxidized. Although the strength of the conventional 7-series alloy can meet the use requirement, the alloy content is about 10 percent, the alloy content is high, a large amount of Zn element in the alloy participates in anodic reaction in anodic oxidation, an oxide film is loosened, and even cracking, bursting or falling are caused, even if part of products are not subjected to anodic oxidation after machining, the conventional 7-series alloy cannot meet the small machining deformation required by an electronic structural member, the surface is fine and smooth after machining such as spraying, and the mass production application cannot be obtained.
In summary, new methods are needed to improve the strength and anodization performance of aluminum alloys.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the Al-Zn-Mg-Cu alloy and the preparation process thereof, the tensile strength of the alloy exceeds 590MPa, and the anodic oxidation performance is excellent.
The Al-Zn-Mg-Cu alloy comprises the following preparation raw materials in percentage by mass:
Zn：6.7～7.2％，
Mg：1.7～2.2％，
Cu：0.20～0.45％，
Mn：0.15～0.30％，
Zr：0.05～0.20％，
the balance of Al;
in the Al-Zn-Mg-Cu alloy, the mass ratio of Zn to Mg is 3.0-4.0, and the total amount of elements of Zn and Mg is less than or equal to 9.2%.
The Al-Zn-Mg-Cu alloy provided by the embodiment of the invention has at least the following technical effects:
the tensile strength sigma b of the alloy in the T6 state is more than or equal to 590Mpa, the yield strength sigma 0.2 is more than or equal to 560Mpa, and the elongation after fracture is more than or equal to 12%.
The alloy has high strength, excellent anodic oxidation performance and continuous oxide film without cracks, and is suitable for being used as a shell or frame structure material of portable electronic equipment.
In the Al-Zn-Mg-Cu alloy of the embodiment of the invention, Zn and Mg are main alloy elements forming a strengthening phase, and the existence of the Zn and the Mg at the same time can form η (MgZn) which can form η (MgZn)2) And T (A1)2Mg2Zn3) The tensile strength of the alloy is increased along with the increase of the contents of Zn and Mg. The Al-Zn-Mg-Cu alloy provided by the embodiment of the invention is designed according to the mass ratio of Zn to Mg of 3.0-4.0, and aims to make Zn and Mg fully utilized and form fine dispersed MgZn2(η) and the Al-Zn-Mg-Cu alloy of the embodiment of the invention stipulates that the total amount of Zn and Mg alloy elements is below 9.2%, thus the micro and macro segregation of the material can be better reduced on the premise of ensuring the strength, the requirements of anodic oxidation and other surface treatment modes can be better met, and the high-quality appearance effect is ensured.
Cu can improve the dispersivity of a precipitation phase in Al-Zn-Mg alloy, is beneficial to improving the strength of the alloy and the glossiness of an anodic oxidation surface, and improves MgZn in the aging process of the alloy2(η) the precipitation stability, improve the distribution of grain boundary precipitation phase, make the material more uniform in the process of anodic oxide film production by anodic oxidation, improve the situation of cracking and shedding of 7-series anodic oxide film to a greater extent, when the Cu content is less than 1%, most of the Cu is fused into MgZn2The strengthening performance of the strengthening phase is improved in the (η) phase, but too much Cu element can increase the extrusion difficulty, reduce the corrosion resistance of the alloy and influence the oxidation effect of the alloy, so that the suitable Cu element range in the Al-Zn-Mg-Cu alloy is 0.20-0.45%.
According to some embodiments of the present invention, the Al-Zn-Mg-Cu alloy contains Mn and Zr in an amount of 0.20 to 0.40% in total.
Mn and Zr in the aluminum alloy matrix and the matrix alloy aluminum are subjected to phase change reaction during homogenization treatment: 6Al + Mn → MnAl6And 3Al + Zr → ZrAl3。MnAl6And ZrAl3The phase energy prevents the recrystallization process of the aluminum alloy, increases the recrystallization temperature, refines the grains of the recrystallized structure, makes the recrystallization of the alloy difficult, and increases the strength of the alloy, as shown in fig. 1, which is a gold phase diagram of an unrecrystallized structure. The addition of Mn is more beneficial to spheroidization of Fe phase hard particles, and is beneficial to improving the processing performance and the oxidation performance of the alloy. The Al-Zn-Mg-Cu alloy of the embodiment of the invention is added with Mn and Zr in a mixed manner, wherein the mass of Mn and Zr is 0.15-0.30% and 0.05-0.20% respectively, and the total amount of Mn and Zr is controlled to be 0.20-0.40%, recrystallization can be inhibited in the hot extrusion process, the strength of the alloy is improved, the grain control in the extrusion process is easier due to the mixed addition, the strengthening phase nucleation can be promoted by Mn and Zr particles, the strength of the alloy can be improved, but the excessive addition can inhibit the recrystallization, trace element agglomeration is generated, and the anodic oxidation effect is seriously influenced.
According to some embodiments of the invention, the Al-Zn-Mg-Cu alloy has a total amount of Fe and Si of 0.18% or less.
Fe and Si are inevitable harmful impurities in the alloy, Fe can reduce the mechanical property of the aluminum alloy, and simultaneously Fe-containing phase is easy to form micro-pores on the oxidized surface so as to reduce the glossiness of the oxidized surface and reduce the anodic oxidation effect of the alloy. Si easily forms Mg with Mg in Al-Zn-Mg alloy2The Si compound reduces the strengthening effect of Mg in the alloy and reduces the strength of the material. Fe. In the presence of Si, except for FeAl3And, outside the Si phase, mainly insoluble or scarcely soluble Al7Cu2Fe. Brittle phases such as AlFeMnSi and the like exist in the form of eutectic compounds, the hot cracking tendency of the alloy is increased, and tiny holes are easily formed in the anode process, so that the uniform continuity of an anode oxide film is influenced, and the anode oxidation effect is influenced. Therefore, the content of Fe and Si is required to be reduced, and the total amount of Fe and Si is controlled to be less than or equal to 0.18 percent.
According to some embodiments of the invention, the Al-Zn-Mg-Cu alloy has Si less than or equal to 0.08%, Fe less than or equal to 0.12%, Cr less than or equal to 0.05%, and Ti less than or equal to 0.10%.
According to the preparation process of the Al-Zn-Mg-Cu alloy, the steps comprise:
s1: proportioning according to a proportion, melting aluminum ingots, and adding zinc ingots and magnesium ingots to obtain an alloyed melt;
s2: adding a refining agent into the alloyed melt in the step S1 for refining, and introducing argon from the bottom of the melt for stirring, exhausting and slagging off during refining;
s3: finely adjusting the components of the melt refined in the step S2 and then standing;
s4: deeply purifying the melt obtained in the step S3, and then pouring to obtain a blank;
s5: and (3) carrying out heat treatment on the blank, and carrying out strong water mist cooling to room temperature to obtain the Al-Zn-Mg-Cu alloy.
According to the embodiment of the invention, in the step S1, the melting temperature of the aluminum ingot is 730-760 ℃.
According to the embodiment of the invention, in the step S2, the refining temperature is 730-750 ℃, and the refining time is 35-45 min.
The addition amount of the refining agent is 2kg per ton of melt, and the refining time is preferably 40 min.
According to the embodiment of the invention, in the step S3, the standing time is 35-45 min. The standing time is preferably 40 min.
According to the embodiment of the invention, in the step S4, the casting temperature is 680-700 ℃.
The deep purification refers to that the melt is subjected to deep purification through a box type degassing device and a double-stage filtering system (2 pieces of 70-mesh foamed ceramic filter plates) in sequence.
According to an embodiment of the present invention, in step S5, the heat treatment method includes: heating to 445-455 ℃, preserving heat for 4h, then heating to 465-475 ℃, preserving heat for 16h, and finally heating to 520 ℃ and preserving heat for 8 h.
The Al-Zn-Mg-Cu alloy of the embodiment of the invention has the material processing method comprising the following steps:
(1) sawing the alloy into short ingots with the length of 600-900 mm;
(2) adding the short cast ingot into an aluminum bar heating furnace, and heating the aluminum bar to 420-500 ℃, preferably 450 ℃;
(3) extruding the short cast ingot, wherein the extrusion speed (main cylinder advancing speed) is 2.0-5.0 mm/s, and preferably 3.0-4.0 mm/s; the extrusion ratio (extrusion coefficient lambda) is 20-60, preferably 25-40;
(4) the on-line quenching is preferably realized by the following steps: passing through a water tank with the water temperature of 5-60 ℃ within 15s, wherein the cooling rate of on-line quenching is more than 30 ℃/s;
(5) material straightening is realized through stretching, and meanwhile, the residual stress of the material is removed, wherein the stretching amount is 1-3%;
(6) artificial aging, the process conditions are as follows: keeping the temperature at 120 +/-5 ℃ for 20-40 h.
Drawings
FIG. 1 is a gold phase diagram of an unrecrystallized structure.
FIG. 2 is a flow chart of the preparation process of example 4.
FIG. 3 is a schematic illustration of oxide film cracking for the 7075 alloy.
Fig. 4 is a schematic illustration of oxide film defects for the 7075 alloy.
FIG. 5 is an SEM topography of the oxide film of the alloy of example 4.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention will be further described with reference to the examples, but the present invention is not limited to the examples.
Example 1
The embodiment provides an Al-Zn-Mg-Cu alloy, which comprises the following preparation raw materials in percentage by mass:
Zn：6.7～7.2％，
Mg：1.7～2.2％，
Cu：0.20～0.45％，
Mn：0.15～0.30％，
Zr：0.05～0.20％，
the balance of Al;
in the Al-Zn-Mg-Cu alloy, the mass ratio of Zn to Mg is 3.0-4.0, and the total amount of elements of Zn and Mg is less than or equal to 9.2%.
Wherein the total content of Mn and Zr is 0.20-0.40%.
The total amount of Fe and Si is less than or equal to 0.18 percent.
Si≤0.08％，Fe≤0.12％，Cr≤0.05％，Ti≤0.10％。
Example 2
The embodiment provides a preparation process of an Al-Zn-Mg-Cu alloy, which comprises the following steps:
s1: proportioning according to a proportion, melting aluminum ingots, and adding zinc ingots and magnesium ingots to obtain an alloyed melt;
s2: adding a refining agent into the alloyed melt in the step S1 for refining, and introducing argon from the bottom of the melt for stirring, exhausting and slagging off during refining;
s3: finely adjusting the components of the melt refined in the step S2 and then standing;
s4: deeply purifying the melt obtained in the step S3, and then pouring to obtain a blank;
s5: and (3) carrying out heat treatment on the blank, and carrying out strong water mist cooling to room temperature to obtain the Al-Zn-Mg-Cu alloy.
In step S1, the melting temperature of the aluminum ingot is 730-760 ℃.
In step S2, the refining temperature is 730-750 ℃, and the refining time is 35-45 min. The addition amount of the refining agent is 2kg per ton of melt, and the refining time is preferably 40 min.
In step S3, the standing time is 35-45 min. The standing time is preferably 40 min.
In step S4, the casting temperature is 680-700 ℃.
The deep purification refers to that the melt is subjected to deep purification through a box type degassing device and a double-stage filtering system (2 pieces of 70-mesh foamed ceramic filter plates) in sequence.
In step S5, the heat treatment method includes: heating to 445-455 ℃, preserving heat for 4h, then heating to 465-475 ℃, preserving heat for 16h, and finally heating to 520 ℃ and preserving heat for 8 h.
Example 3
The embodiment provides a material processing method of an Al-Zn-Mg-Cu alloy, which comprises the following steps:
(1) sawing the alloy into short ingots with the length of 600-900 mm;
(2) adding the short cast ingot into an aluminum bar heating furnace, and heating the aluminum bar to 420-500 ℃, preferably 450 ℃;
(3) extruding the short cast ingot, wherein the extrusion speed (main cylinder advancing speed) is 2.0-5.0 mm/s, and preferably 3.0-4.0 mm/s; the extrusion ratio (extrusion coefficient lambda) is 20-60, preferably 25-40;
(4) the on-line quenching is preferably realized by the following steps: passing through a water tank with the water temperature of 5-60 ℃ within 15s, wherein the cooling rate of on-line quenching is more than 30 ℃/s;
(5) material straightening is realized through stretching, and meanwhile, the residual stress of the material is removed, wherein the stretching amount is 1-3%;
(6) artificial aging, the process conditions are as follows: keeping the temperature at 120 +/-5 ℃ for 20-40 h.
Example 4
The embodiment actually prepares an Al-Zn-Mg-Cu alloy material, which specifically comprises the following steps:
aluminum ingot: an aluminum ingot with the grade of Al99.7 is adopted, the mass percent of Al in the aluminum ingot is more than 99.70 percent, and the mass percent of Fe is less than 0.08 percent, which meets the standard GB/T1196 plus 2008 aluminum ingot for remelting;
zinc ingot: the zinc ingot with the mark of Zn99.95 is adopted, the mass percent of Zn in the zinc ingot is more than 99.95 percent, and the zinc ingot meets the standard GB/T470-2008 zinc ingot;
magnesium ingot: adopting a magnesium ingot with the mark of Mg9990, wherein the mass percent of Mg in the magnesium ingot is more than 99.9 percent, and the magnesium ingot meets the standard GB/T3499-2003 'primary magnesium ingot';
refining agent: a granular refining agent with the mark of PROMAG RI is adopted, and meets the standard YS/T491-2005 'flux for wrought aluminum and aluminum alloy';
refining gas: adopting high-purity argon gas, wherein the purity, namely the volume percentage, is more than or equal to 99.999 percent;
smelting on-line gas treatment: adopting high-purity argon gas, wherein the purity, namely the volume percentage, is more than or equal to 99.999 percent;
the raw materials are sequentially put into a heat accumulating type flame reflection energy-saving furnace for heating and smelting, the fuel adopts natural gas, the process flow is as shown in the attached figure 2, and the specific steps are as follows:
according to the requirements of portable electronic equipment or a middle frame structure on material performance, the tensile strength sigma b is more than or equal to 590Mpa, the yield strength sigma 0.2 is more than or equal to 560Mpa, and the elongation delta is more than or equal to 12 percent, when the alloy components are designed, besides the requirement of improving the alloy strength, the grain control and the oxidation performance of the material need to be fully considered, see table 1;
preparing raw materials: according to the chemical composition of the Al-Zn-Mg-Cu alloy, by mass percent, Zn is 6.96%, Mg1.89%, Fe is less than or equal to 0.10%, Mn0.214%, Zr0.1320%, Cr is less than or equal to 0.01%, Cu0.392%, Ti is less than or equal to 0.02%, Si is less than or equal to 0.03%, and the balance is Al, wherein the content ratio of Zn to Mg is Zn/Mg-3.7, the total content of Zn and Mg is 8.85%, the total content of Fe and Si is less than or equal to 0.13%, and the total content of Mn and Zr is 0.346%;
charging: loading the aluminum ingots in the raw materials into a smelting furnace;
heating and melting: controlling the temperature in the furnace at 750 ℃ to completely melt the aluminum ingot into an aluminum melt;
alloying: adding the zinc ingot and the magnesium ingot into the aluminum melt, stirring to melt the zinc ingot and the magnesium ingot, and preliminarily alloying the melt;
refining: adding a refining agent into the aluminum melt obtained in the previous step, wherein the use amount of the refining agent is 2 kg/ton of the aluminum melt, the refining temperature is 740 ℃, the refining time is 40 minutes, a certain amount of zinc ingots or magnesium ingots are added in the refining process to finely adjust the alloy components of the aluminum melt, high-purity argon is introduced into the aluminum melt through a furnace bottom air brick during refining for stirring and exhausting, then slagging is carried out, the pressure of the argon is controlled to be 0.05-0.1 MPa, and the flow is controlled to be 12L/min;
analysis of alloy components: analyzing alloy elements of the melt obtained after refining in the previous step, and controlling the alloy components within a required range;
standing treatment: standing the aluminum melt for 40 minutes;
online degassing: removing hydrogen by using a box type degassing device outside the furnace, wherein the hydrogen content of the aluminum melt is controlled below 0.12ml/100g. Al;
and (3) online filtering: filtering by adopting a double-stage 70-mesh foam ceramic plate;
casting: adopting a semi-continuous water-cooling casting method, and controlling the casting temperature to 685 ℃;
homogenizing: heating to 450 +/-5 ℃ by adopting a three-stage homogenization process, then preserving heat for 4 hours, heating to 470 +/-5 ℃ and preserving heat for 16 hours, heating to 520 ℃ and preserving heat for 8 hours, and then rapidly cooling to room temperature by using water mist to obtain a long cast rod;
sawing the long cast rod into a short cast rod with a proper length of 600-900 mm;
adding the short cast ingot into an aluminum bar heating furnace, and heating the aluminum bar to 450 ℃;
the extrusion speed (main cylinder advancing speed) was 3.5 mm/s; the extrusion ratio (extrusion factor λ) was 40;
the on-line quenching method comprises the following steps: passing through a water tank with the water temperature of 28 ℃ in 15 seconds, wherein the cooling rate of on-line quenching is 50 ℃/S;
the material straightening is realized by stretching, and the residual stress of the material is removed, wherein the stretching amount is 1.5%;
the conditions of the artificial aging process are as follows: the temperature is kept at 125 ℃ for 24 hours.
TABLE 1 aluminum alloy compositions in percent by mass
Example 5
The Al-Zn-Mg-Cu alloy material is actually prepared according to the following chemical compositions in percentage by mass of Al-Zn-Mg alloy, namely Zn 6.81%, Mg 1.94%, Fe less than or equal to 0.10%, Mn0.22%, Zr0.105%, Cr less than or equal to 0.01%, Cu0.38%, Ti less than or equal to 0.02%, Si less than or equal to 0.03%, and the balance Al, wherein the content ratio of Zn to Mg is 3.5, the total content of Zn and Mg is 8.75%, the total content of Fe and Si is less than or equal to 0.13%, and the total content of Mn and Zr is 0.325%. An aluminum alloy round ingot is produced according to the same process as the example 4.
Example 6
The Al-Zn-Mg-Cu alloy material is actually prepared according to the following chemical compositions in percentage by mass of the Al-Zn-Mg alloy, namely Zn7.09%, Mg 2.10%, Fe less than or equal to 0.10%, Mn0.192%, Zr0.152%, Cr less than or equal to 0.01%, Cu0.401%, Ti less than or equal to 0.02%, Si less than or equal to 0.03%, and the balance Al, wherein the content ratio of Zn to Mg is 3.37, the total content of Zn and Mg is 9.19%, the total content of Fe and Si is less than or equal to 0.13%, and the total content of Mn and Zr is 0.344%. An aluminum alloy round ingot is produced according to the same process as the example 4.
Comparative example 1
The embodiment actually prepares an Al-Zn-Mg-Cu alloy material, which specifically comprises the following steps:
selecting raw materials according to the same chemical components of example 4 and example 4;
charging: loading the aluminum ingots in the raw materials into a smelting furnace;
heating and melting: controlling the temperature in the furnace at 750 ℃ to completely melt the aluminum ingot into an aluminum melt;
alloying: adding the zinc ingot and the magnesium ingot into the aluminum melt, stirring to melt the zinc ingot and the magnesium ingot, and preliminarily alloying the melt;
refining: adding a refining agent into the aluminum melt obtained in the previous step, wherein the use amount of the refining agent is 2 kg/ton of the aluminum melt, the refining temperature is 740 ℃, the refining time is 40 minutes, a certain amount of zinc ingots or magnesium ingots are added in the refining process to finely adjust the alloy components of the aluminum melt, high-purity argon is introduced into the aluminum melt through a furnace bottom air brick during refining to be stirred and exhausted, then slagging is carried out, the argon pressure is controlled to be 0.05-0.1 MPa, and the flow is controlled to be 12L/minute;
analysis of alloy components: carrying out alloy element analysis on the melt obtained after the previous refining step, and controlling the alloy components in the range of the previous step;
standing treatment: standing the aluminum melt for 40 minutes;
online degassing: and a box type degassing device outside the furnace is adopted for removing hydrogen. The hydrogen content of the aluminum melt is controlled below 0.12ml/100 g.Al;
and (3) online filtering: filtering by adopting a double-stage 70-mesh foam ceramic plate;
casting: adopting a semi-continuous water-cooling casting method, and controlling the casting temperature to 685 ℃;
homogenizing: adopting a single-stage homogenization process, heating to 520 ℃, preserving the temperature for 24 hours, and then rapidly cooling to room temperature by using water mist to obtain a long cast rod;
sawing the long cast rod into a short cast rod with a proper length of 600-900 mm;
adding the short cast ingot into an aluminum bar heating furnace, and heating the aluminum bar to 450 ℃;
the extrusion speed (main cylinder advancing speed) was 3.5 mm/s; the extrusion ratio (extrusion factor λ) was 40;
the on-line quenching method comprises the following steps: passing through a water tank with the water temperature of 28 ℃ within 15s, wherein the cooling rate of on-line quenching is 50 ℃/s;
the material straightening is realized by stretching, and the residual stress of the material is removed, wherein the stretching amount is 1.5%;
the conditions of the artificial aging process are as follows: keeping the temperature at 125 ℃ for 24 h.
Comparative example 2
The embodiment actually prepares an Al-Zn-Mg-Cu alloy material, which specifically comprises the following steps:
selecting raw materials according to the same chemical components of example 4 and example 4;
charging: loading the aluminum ingots in the raw materials into a smelting furnace;
heating and melting: controlling the temperature in the furnace at 750 ℃ to completely melt the aluminum ingot into an aluminum melt;
alloying: adding the zinc ingot and the magnesium ingot into the aluminum melt, stirring to melt the zinc ingot and the magnesium ingot, and preliminarily alloying the melt;
refining: adding a refining agent into the aluminum melt obtained in the previous step, wherein the use amount of the refining agent is 2 kg/ton of the aluminum melt, the refining temperature is 740 ℃, the refining time is 40 minutes, a certain amount of zinc ingots or magnesium ingots are added in the refining process to finely adjust the alloy components of the aluminum melt, high-purity argon is introduced into the aluminum melt through a furnace bottom air brick during refining to be stirred and exhausted, then slagging is carried out, the argon pressure is controlled to be 0.05-0.1 MPa, and the flow is controlled to be 12L/minute;
analysis of alloy components: analyzing alloy elements of the melt obtained after refining in the previous step, and controlling the alloy components in the range;
standing treatment: standing the aluminum melt for 40 minutes;
online degassing: removing hydrogen by using a box type degassing device outside the furnace, wherein the hydrogen content of the aluminum melt is controlled below 0.12ml/100g. Al;
and (3) online filtering: filtering by adopting a double-stage 70-mesh foam ceramic plate;
casting: adopting a semi-continuous water-cooling casting method, and controlling the casting temperature to 685 ℃;
homogenizing: heating to 450 +/-5 ℃ by adopting a three-stage homogenization process, then preserving heat for 4 hours, heating to 470 +/-5 ℃ and preserving heat for 16 hours, heating to 520 ℃ and preserving heat for 8 hours, and then rapidly cooling to room temperature by using water mist to obtain a long cast rod;
sawing the long cast rod into a short cast rod with a proper length of 600-900 mm;
adding the short cast ingot into an aluminum bar heating furnace, and heating the aluminum bar to 450 ℃;
the extrusion speed (main cylinder advancing speed) was 6 mm/s; the extrusion ratio (extrusion factor λ) was 70;
the on-line quenching method comprises the following steps: passing through a water tank with the water temperature of 28 ℃ in 15 seconds, wherein the cooling rate of on-line quenching is 50 ℃/S;
the material straightening is realized by stretching, the residual stress of the material is removed, the stretching amount is 1.5 percent,
the conditions of the artificial aging process are as follows: the temperature is kept at 125 ℃ for 24 hours.
Test example
The round cast ingots prepared in the examples 4-6 and the comparative examples 1 and 2 are sawn into short materials, and the process comprises the following steps: the extrusion temperature is 450 ℃, the extrusion ratio is 35, the extrusion speed (main cylinder advancing speed) is 3.0mm/s, online water penetration cooling is carried out, the aging temperature is 120 ℃, the aging time is 28h, and the size of the prepared section is as follows: an extruded sheet having a width of 90mm and a thickness of 14mm was subjected to heat treatment in a T6 state.
According to GB/T228.1-2010 part 1 of the tensile test of metallic materials: room temperature test method for mechanical properties of the plate, the test results are shown in Table 2. The national standard GB/T6892-. The yield is the standard for failure in the use process of the electronic structural member, compared with the national standard 7075-T6, the yield strength of the alloy is 24 percent higher, 81 percent higher than the 6013-T6 standard, and 138 percent higher than the 6061-T6 standard.
The plate produced in example 4 was compared with conventional 6061, 6013, 7075 materials by oxidation, the oxidation process was carried out for 20min by the conventional sulfuric acid anodizing process, and the condition of the anodic film was observed after oxidation, as shown in table 3.
TABLE 2 mechanical Property test results
TABLE 3 extruded profile oxide film conditions
| Alloy material | Condition of oxide film |
| 6061 | The oxide film is uniform, continuous and crackless |
| 7075 | The oxide film was cracked (see FIG. 3), and had defects (see FIG. 4) |
| 6013 | The oxide film is uniform, continuous and crackless |
| Example 4 | The oxide film is uniform, continuous and crackless (see figure 5) |
Claims (10)
- The Al-Zn-Mg-Cu alloy is characterized by comprising the following preparation raw materials in percentage by mass:Zn：6.7～7.2％，Mg：1.7～2.2％，Cu：0.20～0.45％，Mn：0.15～0.30％，Zr：0.05～0.20％，the balance of Al;in the Al-Zn-Mg-Cu alloy, the mass ratio of Zn to Mg is 3.0-4.0, and the total amount of elements of Zn and Mg is less than or equal to 9.2%.
- 2. The Al-Zn-Mg-Cu alloy according to claim 1, wherein the total amount of Mn and Zr is 0.20 to 0.40%.
- 3. The Al-Zn-Mg-Cu alloy according to claim 1, wherein the total amount of Fe and Si in said Al-Zn-Mg-Cu alloy is 0.18% or less.
- 4. The Al-Zn-Mg-Cu alloy according to claim 1, wherein in the Al-Zn-Mg-Cu alloy, Si is 0.08% or less, Fe is 0.12% or less, Cr is 0.05% or less, and Ti is 0.10% or less.
- 5. The Al-Zn-Mg-Cu alloy production process according to any one of claims 1 to 4, characterized by comprising the steps of:s1: proportioning according to a proportion, melting aluminum ingots, and adding zinc ingots and magnesium ingots to obtain an alloyed melt;s2: adding a refining agent into the alloyed melt in the step S1 for refining, and introducing argon from the bottom of the melt for stirring, exhausting and slagging off during refining;s3: finely adjusting the components of the melt refined in the step S2 and then standing;s4: deeply purifying the melt obtained in the step S3, and then pouring to obtain a blank;s5: and (3) carrying out heat treatment on the blank, and carrying out strong water mist cooling to room temperature to obtain the Al-Zn-Mg-Cu alloy.
- 6. The Al-Zn-Mg-Cu alloy production process according to claim 5, wherein in step S1, the temperature at which the aluminum ingot is melted is 730 to 760 ℃.
- 7. The Al-Zn-Mg-Cu alloy as claimed in claim 5, wherein in step S2, the temperature of refining is 730-750 ℃ and the time of refining is 35-45 min.
- 8. The Al-Zn-Mg-Cu alloy production process according to claim 5, wherein in step S3, the standing time is 35 to 45 min.
- 9. The Al-Zn-Mg-Cu alloy as claimed in claim 5, wherein in step S4, the casting temperature is 680-700 ℃.
- 10. The Al-Zn-Mg-Cu alloy production process according to claim 5, wherein in step S5, the heat treatment method is: heating to 445-455 ℃, preserving heat for 4h, then heating to 465-475 ℃, preserving heat for 16h, and finally heating to 520 ℃ and preserving heat for 8 h.
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| CN111593239A (en) * | 2020-05-27 | 2020-08-28 | 北京科技大学 | Low-cost high-formability aluminum alloy plate for vehicle body structure and preparation method thereof |
| CN111961935A (en) * | 2020-08-14 | 2020-11-20 | 福建祥鑫股份有限公司 | High-impact 7-series aluminum alloy and preparation method thereof |
| WO2021157356A1 (en) * | 2020-02-04 | 2021-08-12 | アイシン軽金属株式会社 | Production method of high-strength aluminum alloy extruded material |
| CN114231805A (en) * | 2021-12-20 | 2022-03-25 | 广东中色研达新材料科技股份有限公司 | 7-series aluminum alloy for consumer electronics and processing technology thereof |
| CN115747586A (en) * | 2022-10-28 | 2023-03-07 | 福建祥鑫新材料科技有限公司 | High-strength aluminum alloy for electronic products and preparation method thereof |
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