CN109735750A - A kind of the Al-Zn-Mg-Cu-Er-Zr alloy and its preparation process of high strength anti-corrosion - Google Patents
A kind of the Al-Zn-Mg-Cu-Er-Zr alloy and its preparation process of high strength anti-corrosion Download PDFInfo
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Abstract
A kind of the Al-Zn-Mg-Cu-Er-Zr alloy and its preparation process of high strength anti-corrosion, belong to nonferrous materials field.The mass ratio for focusing on adjusting the alloying element in Al-Zn-Mg-Cu of the invention, and compound addition Er, Zr element, play its Microalloying Effect, pinning dislocation, inhibit recrystallization, and make the alloy while guaranteeing high-strength by suitable heat treatment process, there is good anti-strip corrosive nature.
Description
Technical field
The present invention relates to a kind of Al-Zn-Mg-Cu-Er-Zr aluminium alloy of high strength anti-corrosion, it can be used for aerospace and civilian
Field belongs to nonferrous materials field.
Background technique
Al-Zn-Mg-Cu aluminum alloy is ultra-high-strength aluminum alloy, has density small, and specific strength is high, and hot-working character is good etc.
Feature, is widely used in aerospace, and the fields such as communications and transportation become airframe, Liang Yi, the high-strength structures such as stringer
The important materials of component.In recent years, develop along with space flight and aviation industry, transportation to modernization, high speed direction, transport
The lightweight of tool is increasingly strong.It is high-intensitive from initial only simple pursuit in terms of the selection of important load-carrying member, to now
The comprehensive performances such as high-strength high-ductility corrosion are being required, therefore the requirement to aluminum alloy materials is also higher and higher.And rare earth element is in aluminium
There is purification in alloy, go bad and the conjunction of the series such as rafifinal, Al-Mg, Al-Li is added in the effect of microalloying, rare earth Er
Jin Zhong can make crystal grain refinement, and by dislocation and sub boundary in the form of Al3Er particle as heterogeneous nuclei
Pinning effect, effectively inhibit recrystallization, refine recrystal grain, improve the intensity and hardness of alloy.
7xxx line aluminium alloy can be such that alloy obtains as a kind of heat-treatable strengthened alloy by suitable heat treatment process
Excellent institutional framework is obtained, to improve its comprehensive performance.Alloy is in ag(e)ing process, the size and number density of matrix precipitate
Have a great impact to alloy strength hardness, and the size of Grain Boundary Precipitates and distribution then determine the corrosion resistance of alloy.This hair
It is bright to be based on considerations above, a kind of Al-Zn-Mg-Cu-Er-Zr alloy of high strength anti-corrosion is devised, and find and be suitble to the alloy
Heat treatment process, make it under conditions of keeping higher-strength, improve its chipping resistance corrosive nature, obtain excellent comprehensive
Energy.
Summary of the invention
The object of the present invention is to provide a kind of Al-Zn-Mg-Cu-Er-Zr alloys, and finding keeps alloy acquisition high-strength resistance to
The heat treatment process of the good comprehensive performance of erosion.
A kind of Al-Zn-Mg-Cu alloy of micro addition Er, Zr, which is characterized in that the mass percent of alloy are as follows: Zn:
8.3 ± 1.0%, Mg:2.10 ± 0.5%, Cu:2.50 ± 0.5%, Er:0.1-0.5%, Zr:0.03-0.3%, surplus Al.
Ingot blank is prepared, 300 DEG C or more of hot-working is carried out to ingot blank, obtains processing material.
A kind of heat treatment process of the Al-Zn-Mg-Cu alloy of micro addition Er, Zr, comprising the following steps:
Step 1: solution treatment-water quenching
The solution treatment that hot worked alloy is carried out to 450 DEG C or more, so that the last phase back dissolving as far as possible in alloy.
Step 2: ageing treatment
Single-stage aging technique are as follows: 100~180 DEG C of single-stage agings are carried out, when single-stage aging can keep the temperature different as needed
Between, preferably 0~72h of heat preservation.
Or two-stage time effect process are as follows: pass through 110-130 DEG C of low temperature preageing and the twin-stage of 150-170 DEG C of higher temperature timeliness
Aging technique, preferably first order aging treatment process are to rise to 120 DEG C from room temperature with the heating rate of 1 DEG C/min, keep the temperature 8h.
By the resulting alloy of first order ageing treatment, 150~170 directly are warming up to from 120 DEG C with the heating rate of 1 DEG C/min with furnace
DEG C, 0~48h is then kept the temperature, room temperature is then air-cooled to.
Advanced optimize: single-stage peak timeliness technique be 120 DEG C/for 24 hours, two-stage time effect process is that first order aging technique is
120 DEG C/8h, second level aging technique be 150 DEG C heat preservation 12~48h or 160 DEG C heat preservation 4~16h or 170 DEG C heat preservation 6~
16h。
Using above-mentioned single-stage aging technique, alloy can be made to reach high-strength state；And it can be made using above-mentioned two-stage time effect process
The chipping resistance corrosive nature of alloy is graded in EA or more.
Specific embodiment
It elaborates below in conjunction with specific embodiment to the present invention, the present invention is not limited to following embodiments.
Embodiment 1
Alloying component mass percent are as follows: Zn:8.28%, Mg:2.10%, Cu:2.50%, Er:0.47%, Zr:
0.13%, surplus Al.
Melting and slagging-off are carried out first in intermediate frequency furnace, smelting temperature is controlled at 700~740 DEG C, then by melt transfer in
Between packet in refine, stand a period of time after be transferred in bottom pour ladle, stay for some time in bottom pour ladle, then carry out injection forming examination
It tests, obtains injection deposition blank；The isothermal holding that 450 DEG C/8h is carried out to deposit preform, obtains plate by hot extrusion.To the present invention
After alloy carries out the solid solution Water Quenching of 450 DEG C/2h+475 DEG C/2h, alloy resulting after solution treatment is subjected to single-stage aging
Processing, specific aging treatment process are as follows: rise to 120 DEG C from room temperature with the heating rate of 1 DEG C/min, heat preservation is air-cooled to room afterwards for 24 hours
Temperature.According to GB/T22639-2008 and GB/T228.1-2010 standard, hardness is carried out to sample, conductivity carries out Peeling Corrosion
And tensile property test, experimental result are shown in Table one.
Table one is the alloy extrusion state and single-stage peak timeliness aspect product test performance data
Embodiment 2
Alloying component mass percent are as follows: Zn:8.28%, Mg:2.10%, Cu:2.50%, Er:0.47%, Zr:
0.13%, surplus Al.
Melting and slagging-off are carried out first in intermediate frequency furnace, smelting temperature is controlled at 700~740 DEG C, then by melt transfer in
Between packet in refine, stand a period of time after be transferred in bottom pour ladle, stay for some time in bottom pour ladle, then carry out injection forming examination
It tests, obtains injection deposition blank；The isothermal holding that 450 DEG C/8h is carried out to deposit preform, obtains plate by hot extrusion.To the present invention
After alloy carries out the solid solution Water Quenching of 450 DEG C/2h+475 DEG C/2h, alloy resulting after solution treatment is subjected to single-stage aging
Processing, specific aging treatment process are as follows: rise to 150 DEG C from room temperature with the heating rate of 1 DEG C/min, be air-cooled to room after keeping the temperature 20h
Temperature.Hardness, conductivity test are carried out to sample, measuring hardness is 213.8HV, conductivity 35.71%IACS.
Embodiment 3: alloying component mass percent are as follows: Zn:8.28%, Mg:2.10%, Cu:2.50%, Er:0.47%,
Zr:0.13%, surplus Al.
Melting and slagging-off are carried out first in intermediate frequency furnace, smelting temperature is controlled at 700~740 DEG C, then by melt transfer in
Between packet in refine, stand a period of time after be transferred in bottom pour ladle, stay for some time in bottom pour ladle, then carry out injection forming examination
It tests, obtains injection deposition blank；The isothermal holding that 450 DEG C/8h is carried out to deposit preform, obtains plate by hot extrusion.To the present invention
After alloy carries out the solid solution Water Quenching of 450 DEG C/2h+475 DEG C/2h, alloy resulting after solution treatment is subjected to two-stage time effect
Processing, specific aging treatment process are as follows: rise to 120 DEG C from room temperature with the heating rate of 1 DEG C/min, be warming up to after keeping the temperature 8h with furnace
150 DEG C, 0-48h is kept the temperature, it is then air-cooled.According to GB/T22639-2008 and GB/T228.1-2010 standard, sample is carried out hard
Degree, conductivity, carries out Peeling Corrosion and tensile property test, experimental result are shown in Table two.
Table two is that second level aging temp is 150 DEG C of different aging time sample test performance datas
Embodiment 4: alloying component mass percent are as follows: Zn:8.28%, Mg:2.10%, Cu:2.50%, Er:0.47%,
Zr:0.13%, surplus Al.
Melting and slagging-off are carried out first in intermediate frequency furnace, smelting temperature is controlled at 700~740 DEG C, then by melt transfer in
Between packet in refine, stand a period of time after be transferred in bottom pour ladle, stay for some time in bottom pour ladle, then carry out injection forming examination
It tests, obtains injection deposition blank；The isothermal holding that 450 DEG C/8h is carried out to deposit preform, obtains plate by hot extrusion.To the present invention
After alloy carries out the solid solution Water Quenching of 450 DEG C/2h+475 DEG C/2h, alloy resulting after solution treatment is subjected to two-stage time effect
Processing, specific aging treatment process are as follows: rise to 120 DEG C from room temperature with the heating rate of 1 DEG C/min, be warming up to after keeping the temperature 8h with furnace
160 DEG C, 0-48h is kept the temperature, it is then air-cooled.According to GB/T22639-2008 and GB/T228.1-2010 standard, sample is carried out hard
Degree, conductivity, carries out Peeling Corrosion and tensile property test, experimental result are shown in Table three.
Table three is that second level aging temp is 160 DEG C of different aging time sample test performance energy data
Embodiment 5: alloying component mass percent are as follows: Zn:8.28%, Mg:2.10%, Cu:2.50%, Er:0.47%,
Zr:0.13%, surplus Al.
Melting and slagging-off are carried out first in intermediate frequency furnace, smelting temperature is controlled at 700~740 DEG C, then by melt transfer in
Between packet in refine, stand a period of time after be transferred in bottom pour ladle, stay for some time in bottom pour ladle, then carry out injection forming examination
It tests, obtains injection deposition blank；The isothermal holding that 450 DEG C/8h is carried out to deposit preform, obtains plate by hot extrusion.To the present invention
After alloy carries out the solid solution Water Quenching of 450 DEG C/2h+475 DEG C/2h, alloy resulting after solution treatment is subjected to two-stage time effect
Processing, specific aging treatment process are as follows: rise to 120 DEG C from room temperature with the heating rate of 1 DEG C/min, be warming up to after keeping the temperature 8h with furnace
170 DEG C, 0-48h is kept the temperature, it is then air-cooled.According to GB/T22639-2008 and GB/T228.1-2010 standard, sample is carried out hard
Degree, conductivity, carries out Peeling Corrosion and tensile property test, experimental result are shown in Table four.
Table four is that second level aging temp is 170 DEG C of different aging time sample test performance energy data
Table five is other aging time sample test performance datas in embodiment 2~4
| Heat treatment temperature/time | Hardness (HV) | Conductivity (%IACS) | Peeling Corrosion grade |
| 150℃/2h | 178.4 | 31.66 | EC |
| 150℃/6h | 194.9 | 33.48 | EB |
| 150℃/8h | 188.3 | 33.91 | EB |
| 150℃/10h | 185.8 | 34.23 | EB |
| 150℃/14h | 184.8 | 35.11 | EA |
| 150℃/16h | 182.3 | 36.18 | EA |
| 150℃/18h | 180.9 | 36.45 | EA |
| 150℃/20h | 175.2 | 36.78 | EA |
| 150℃/24h | 174.1 | 37.43 | PC |
| 150℃/28h | 174.0 | 37.78 | PC |
| 150℃/36h | 165.0 | 38.74 | PC |
| Heat treatment temperature/time | Hardness (HV) | Conductivity (%IACS) | Peeling Corrosion grade |
| 170℃/6h | 173.2 | 38.51 | EA |
| 170℃/8h | 172.1 | 39.33 | EA |
| 170℃/12h | 165.6 | 40.16 | PC |
| 170℃/14h | 161.9 | 40.53 | PC |
| 170℃/18h | 159.8 | 41.33 | PC |
| 170℃/20h | 157.2 | 41.61 | PC |
| 170℃/22h | 155.4 | 41.74 | PC |
| 170℃/24h | 153 | 41.97 | PC |
| 170℃/28h | 148.2 | 42.29 | PC |
| 170℃/36h | 145 | 42.78 | PB |
| 170℃/48h | 142.6 | 43.27 | PB |
When the second level aging temp of heating two-stage time effect heat treatment is 150 DEG C at a slow speed it can be seen from table two and table five,
When soaking time is 4h, yield strength 595MPa, Peeling Corrosion grade is EC rank, hardness 184.3HV；Soaking time is
When 6~10h, Peeling Corrosion grade is EB, and hardness is in 185.8~194.9HV；Soaking time is in 12~20h, Peeling Corrosion etc.
Grade is EA, and hardness is 175.2~185.2HV, tensile strength > 592MPa, yield strength > 572.5MPa；Soaking time is 22
When~48h, tensile strength in 539.5~592MPa, yield strength in 506.5~572.5MPa, elongation percentage 13.0~
14.0%, hardness is in 161.3~174.2HV, and for conductivity in 37.02~39.81%IACS, Peeling Corrosion grade is PC grades
Not.
When the second level aging temp of heating two-stage time effect heat treatment is 160 DEG C at a slow speed it can be seen from table three and table five,
In 4~16h, tensile strength exists in 549.5~597MPa, yield strength in 519.5~577MPa, elongation percentage soaking time
8.7~10.5%, hardness is 164.7~182.1HV, and conductivity is 34.92~39.21%IACS, and Peeling Corrosion grade is
EA or PC rank.
When the second level aging temp of heating two-stage time effect heat treatment is 170 DEG C at a slow speed it can be seen from table four and table five,
Soaking time is in 6~16h, tensile strength >=505MPa, yield strength >=450MPa, and hardness is 161.2~173.2HV, electricity
Conductance is 38.51~40.96%IACS, and Peeling Corrosion grade is EA or PC rank.
As shown in Table 1, compared with 120 DEG C of single-stage aging state/for 24 hours, tensile strength is improved the As-extruded of alloy by 374MPa
683MPa is arrived, yield strength has been increased to 641MPa by 215MPa, and elongation percentage is declined slightly.
Contrast table one and table two, table three, table four, it can be seen that alloy is after two-stage time effect process is handled, corrosion resistance
It can significantly improve, intensity slightly reduces.
To guarantee alloy yield strength in 450MPa or more, Peeling Corrosion grade rises at a slow speed in EA or PC rank, optimization
Warm two-stage time effect system are as follows: first order aging technique is 120 DEG C/8h, and second level institution of prescription is 150 DEG C of 12~48h of heat preservation,
160 DEG C of heat preservations 4~16h, 170 DEG C of 6~16h of heat preservation.
Claims (5)
1. a kind of Al-Zn-Mg-Cu alloy of micro addition Er, Zr, which is characterized in that the mass percent of alloy are as follows: Zn:8.3
± 1.0%, Mg:2.10 ± 0.5%, Cu:2.50 ± 0.5%, Er:0.1-0.5%, Zr:0.03-0.3%, surplus Al.
2. the preparation of the Al-Zn-Mg-Cu alloy of micro addition Er, the Zr of one kind described in claim 1, which is characterized in that prepare ingot
Base carries out 300 DEG C or more of hot-working to ingot blank, obtains processing material.
3. the preparation of the Al-Zn-Mg-Cu alloy according to micro addition Er, the Zr of one kind described in claim 2, which is characterized in that right
Process the solution treatment that material carries out 450 DEG C or more.
4. the preparation of the Al-Zn-Mg-Cu alloy according to micro addition Er, the Zr of one kind described in claim 3, which is characterized in that Gu
Ageing treatment is carried out after molten processing: by obtaining high-strength performance, passing through 110-130 DEG C in 100-180 DEG C of progress single-stage aging
The two-stage time effect process of low temperature preageing and 150-170 DEG C of higher temperature timeliness improves alloy corrosion resistance energy.
5. the preparation of the Al-Zn-Mg-Cu alloy according to micro addition Er, the Zr of one kind described in claim 2-4, which is characterized in that
Single-stage peak timeliness technique be 120 DEG C/for 24 hours；Two-stage time effect process is that first order aging technique is 120 DEG C/8h, second level timeliness
Technique is 150 DEG C of 12~48h or 160 DEG C of heat preservations of heat preservation, 4~16h or 170 DEG C of 6~16h of heat preservation.
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| CN114457297A (en) * | 2022-01-14 | 2022-05-10 | 北京工业大学 | Method for reducing thermoplastic deformation resistance of injection-molded aluminum alloy |
| CN114525435A (en) * | 2022-01-20 | 2022-05-24 | 江西理工大学 | Er and Pr added high-strength corrosion-resistant Al-Zn-Mg-Cu alloy and preparation method thereof |
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Application publication date: 20190510 |