CN108531789A - A kind of high-strength endurance aluminum alloy doorframe and its preparation process - Google Patents
A kind of high-strength endurance aluminum alloy doorframe and its preparation process Download PDFInfo
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- CN108531789A CN108531789A CN201810561763.1A CN201810561763A CN108531789A CN 108531789 A CN108531789 A CN 108531789A CN 201810561763 A CN201810561763 A CN 201810561763A CN 108531789 A CN108531789 A CN 108531789A
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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
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
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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
- C22C1/10—Alloys containing non-metals
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- C22C1/1047—Alloys containing non-metals starting from a melt by mixing and casting liquid metal matrix composites
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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
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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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
- C22F1/043—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 silicon as the next major constituent
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Abstract
The invention discloses a kind of high-strength endurance aluminum alloy doorframe and its preparation processes, and by weight percentage, the high-strength endurance aluminum alloy doorframe contains following element：Silica flour：6.18 12.87%, magnesium：1.28 3.56%, iron powder：0.89 1.75%, nano-carbon powder：0.56 0.95%, boron：0.12 0.31%, titanium：0.03 0.16%, chromium：0.26 0.48%, nitrogen：0.16 0.54%, trace additives：0.005 0.12%, for Control of Impurities less than or equal to 0.01%, remaining is aluminium.The content that the present invention passes through optimization each component, it mutually compensates for, intensity is low during solving existing aluminium alloy use, the characteristics of being easily deformed, and there is good impact resistance and fatigue durability using aluminum alloy doorframe made of material of the present invention, its service life is greatly improved, the generation of contingency is reduced.
Description
Technical field
The present invention relates to aluminum alloy doorframe technical fields, and in particular to a kind of high-strength endurance aluminum alloy doorframe and its preparation
Technique.
Background technology
Aluminum alloy doorframe is by surface-treated aluminium alloy extrusions, through processing such as blanking, punching, groove milling, tapping, making
The doorframe component that technical face is fabricated to, then be assembled together with connector, sealing material and opening and closing Hardware fitting.With
The continuous improvement of science and technology being constantly progressive with living standard, the requirement to performances such as aluminum alloy doorframe mechanical strength, endurances
It is continuously improved.
Therefore, it is necessary to look for a kind of high-strength endurance aluminum alloy doorframe.
By being retrieved to the prior art, in Chinese invention patent application 201510285971.X（Publication date 2015
On September 2,）A kind of endurance damage building template aluminium alloy is disclosed, is related to field of constructional engineering material, it is by following heavy
The group of amount percentage composition is grouped as：Si0.02-0.04%, Fe0.05-0.06%, Cu1.4-1.8%, Mn0.005-0.01%,
Mg2.3-2.6%, Zn5.2-6.3%, Ti0.01-0.03%, Cr0.01-0.015%, Ni0.01-0.02%, Mo0.2-0.6%,
V0.15-0.2%, B0.06-0.12% add up to Za Zhi≤0.15%, remaining is Al.The present invention solves existing building template aluminium
Alloy weatherability and the low problem of corrosion resistance.But the Al-alloy products mechanical strength, endurance are unable to reach requirement.
And in Chinese invention patent application 201310687806.8（Publication date on April 9th, 2014）It discloses a kind of high-strength
The preparation process of antifatigue aluminum alloy section, the mass percent which forms are：Si0.02-0.05、
Fe0.04-0.08、Cu4.4-5.2、Mg1.8-2.6、Mn0.6-1.2、Ni0.4-0.8、Sb0.3-0.5、Ag0.15-0.35、
Zn0.03-0.06, Ti0.02-0.04, Cr0.01-0.02, Bi0.005-0.015, Nd0.02-0.03, Tb0.01-0.02, it is remaining
Amount is Al.The present invention is improved elements and the rational heat treatment process such as Mn, Ni, is changed by the content of the elements such as reduction Fe, Si
Fracture toughness, fatigue durability, anti-stress corrosiveness and the thermal stability of kind alloy.Intensity of aluminum alloy obtained is high, good toughness, high
Antifatigue, service life is long, has a wide range of application.But still it can not meet the requirement of the high fatigue performance of high intensity.
Invention content
The shortcomings that it is an object of the invention to overcome the prior art and deficiency, provide a kind of high-strength endurance aluminium alloy door
Frame has intensity high, and fatigue performance is excellent, can meet the requirement of production and application.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of high-strength endurance aluminum alloy doorframe, by weight percentage, the high-strength endurance aluminum alloy doorframe contain following
Element：Silica flour：6.18-12.87%, magnesium：1.28-3.56%, iron powder：0.89-1.75%, nano-carbon powder：0.56-0.95%,
Boron：0.12-0.31%, titanium：0.03-0.16%, chromium：0.26-0.48%, nitrogen：0.16-0.54%, trace additives：
0.005-0.12%, for Control of Impurities less than or equal to 0.01%, remaining is aluminium.
Preferably, by weight percentage, the high-strength endurance aluminum alloy doorframe contains following element：Silica flour：8.26-
10.15%, magnesium：1.84-2.37%, iron powder：0.89- 1.75%, nano-carbon powder：0.56-0.95%, boron：0.12-0.31%,
Titanium：0.03-0.16%, chromium：0.31-0.43%, nitrogen：0.38-0.50%, trace additives：0.005-0.12%, impurity control
For system less than or equal to 0.01%, remaining is aluminium.
Preferably, the nitrogen in the aluminum alloy doorframe exists in the form of nitride.
Preferably, the nitride is at least one of titanium nitride, aluminium nitride and silicon nitride.
Preferably, the micro- addition element is at least one of yttrium, cerium, promethium, gallium, bismuth.
The present invention also provides the preparation processes of above-mentioned high-strength endurance aluminum alloy doorframe, include the following steps：
（1）Fine aluminium is added in resistance furnace, and furnace temperature is risen to 760-780 DEG C, after aluminium block thawing, is sequentially added in magnalium
Between alloy, aluminium titanium intermediate alloy, aluminium chromium hardener, aluminium boron intermediate alloy, after intermediate alloy completely melt after, agitating solution 2-
4min obtains aluminum alloy melt；
（2）Silica flour, iron powder, nano-carbon powder, nitrogen, trace element are worn into mix powder；
（3）By step（2）Mix powder is added in molten aluminium alloy liquid, and furnace temperature is risen to 830-850 DEG C, is sufficiently stirred
Uniformly, it is then allowed to stand heat preservation 30-50min, furnace temperature is down to 700 DEG C, high-purity argon gas degasification 10-15min is then used, skims, is protected
Temperature stands 10min, and furnace temperature is down to 600 DEG C again later, casts after skimming again, obtains aluminium alloy cast ingot；
（4）By step（3）In aluminium alloy cast ingot be put into homogenizing furnace and carry out homogenizing annealing processing；
（5）Aluminium alloy cast ingot base after Homogenization Treatments is preheated to 450-470 DEG C, then utilizes extruder by the casting after preheating
Base is put into extrusion molding in mold；
（6) by step（5）Aluminium alloy cast ingot is warming up to 320-340 DEG C by the aluminum alloy doorframe squeezed out under vacuum
Lower heat preservation 1-2h continues to be heated to 460 DEG C of 450-, keeps the temperature 40-50min, then water cooling is to 220-240 DEG C, then is air-cooled to room
Temperature.
（7）Ageing treatment for the first time is carried out to aluminum alloy doorframe again, is then kept the temperature, then carry out second of ageing treatment.
Preferably, step（2）In, further include that mix powder sieves with 100 mesh sieve.
Preferably, step（4）In, the homogenizing annealing processing：It first is warming up to 180-200 DEG C with 50-60 DEG C/h, heat preservation
3-5h, then it is warming up to 360-380 DEG C with 30-40 DEG C/h, 4-6h is kept the temperature, then 460-480 DEG C is warming up to 50-60 DEG C/h, heat preservation
Then 2-3h is cooled to 230-250 DEG C with 70-80 DEG C/h, keep the temperature 3-5h, then be warming up to 460-480 DEG C with 90-100 DEG C/h, protect
Then warm 2-3h is cooled to 140-150 DEG C with 120-140 DEG C/h, keep the temperature 4-6h, be air-cooled to room temperature.
Preferably, step（5）In, the extruding rate is 3-5mm/min.
Preferably, step（7）In, the temperature of the ageing treatment for the first time is 140-150 DEG C, soaking time 9-11h；The
Secondary ageing treatment process is that temperature is 130-150 DEG C, soaking time 17-19h.
Compared with prior art, the present invention the present invention has following advantageous effect：
（1）The present invention is mutually compensated for by the content of optimization each component, and intensity is low during solving existing aluminium alloy use,
The characteristics of being easily deformed, and there is good impact resistance and endurance using aluminum alloy doorframe made of material of the present invention
Property, its service life is greatly improved, the generation of contingency is reduced.
（2）The present invention introduces nitride in aluminum alloy doorframe, improves aluminum alloy doorframe intensity, while nitride is stronger
Stability improves the fatigue performance of aluminum alloy doorframe.
（3）The present invention by adding a variety of alloying elements such as a small amount of yttrium, cerium, promethium, gallium, bismuth come crystal grain thinning, tie again by change
Crystalline state improves the elevated temperature strength and the performances such as endurance, wear-resisting, shock resistance of alloy.
（4）The present invention by casting, Homogenization Treatments, solution treatment, ageing treatment and etc. optimization, improve aluminium alloy
The intensity and fatigue performance of doorframe.
Specific implementation mode
Form by the following examples is described in further detail the above of the present invention again, but should not be by this
The range for being interpreted as the above-mentioned theme of the present invention is only limitted to following embodiment, all based on the technology realized belonging to the above of the present invention
It all belongs to the scope of the present invention.
Embodiment 1
The high-strength endurance aluminum alloy doorframe of the present embodiment, by weight percentage, the high-strength endurance aluminum alloy doorframe contain
There is following element：Silica flour：6.18%, magnesium：1.28%, iron powder：0.89%, nano-carbon powder：0.56%, boron：0.12%, titanium：
0.03%, chromium：0.26%, nitrogen：0.16%, trace additives：0.005%, Control of Impurities less than or equal to 0.01%, remaining
For aluminium.
Wherein, the nitrogen in the aluminum alloy doorframe exists in the form of nitride.
Wherein, the nitride is at least one of titanium nitride, aluminium nitride and silicon nitride.
Wherein, the micro- addition element is at least one of yttrium, cerium, promethium, gallium, bismuth.
The present invention also provides the preparation processes of above-mentioned high-strength endurance aluminum alloy doorframe, include the following steps：
（1）Fine aluminium is added in resistance furnace, and furnace temperature is risen to 760-780 DEG C, after aluminium block thawing, is sequentially added in magnalium
Between alloy, aluminium titanium intermediate alloy, aluminium chromium hardener, aluminium boron intermediate alloy, after intermediate alloy completely melt after, agitating solution 2-
4min obtains aluminum alloy melt；
（2）Silica flour, iron powder, nano-carbon powder, nitrogen, trace element are worn into mix powder；
（3）By step（2）Mix powder is added in molten aluminium alloy liquid, and furnace temperature is risen to 830-850 DEG C, is sufficiently stirred
Uniformly, it is then allowed to stand heat preservation 30-50min, furnace temperature is down to 700 DEG C, high-purity argon gas degasification 10-15min is then used, skims, is protected
Temperature stands 10min, and furnace temperature is down to 600 DEG C again later, casts after skimming again, obtains aluminium alloy cast ingot；
（4）By step（3）In aluminium alloy cast ingot be put into homogenizing furnace and carry out homogenizing annealing processing；
（5）Aluminium alloy cast ingot base after Homogenization Treatments is preheated to 450-470 DEG C, then utilizes extruder by the casting after preheating
Base is put into extrusion molding in mold；
（6) by step（5）Aluminium alloy cast ingot is warming up to 320-340 DEG C by the aluminum alloy doorframe squeezed out under vacuum
Lower heat preservation 1-2h continues to be heated to 460 DEG C of 450-, keeps the temperature 40-50min, then water cooling is to 220-240 DEG C, then is air-cooled to room
Temperature.
（7）Ageing treatment for the first time is carried out to aluminum alloy doorframe again, is then kept the temperature, then carry out second of ageing treatment.
Wherein, step（2）In, further include that mix powder sieves with 100 mesh sieve.
Wherein, step（4）In, the homogenizing annealing processing：It first is warming up to 180-200 DEG C with 50-60 DEG C/h, keeps the temperature 3-
5h, then it is warming up to 360-380 DEG C with 30-40 DEG C/h, 4-6h is kept the temperature, then 460-480 DEG C is warming up to 50-60 DEG C/h, keeps the temperature 2-
Then 3h is cooled to 230-250 DEG C with 70-80 DEG C/h, keep the temperature 3-5h, then be warming up to 460-480 DEG C with 90-100 DEG C/h, heat preservation
Then 2-3h is cooled to 140-150 DEG C with 120-140 DEG C/h, keep the temperature 4-6h, be air-cooled to room temperature.
Wherein, step（5）In, the extruding rate is 3-5mm/min.
Wherein, step（7）In, the temperature of the ageing treatment for the first time is 140-150 DEG C, soaking time 9-11h；Second
Secondary aging treatment process is that temperature is 130-150 DEG C, soaking time 17-19h.
Embodiment 2
The high-strength endurance aluminum alloy doorframe of the present embodiment, by weight percentage, the high-strength endurance aluminum alloy doorframe contain
There is following element：Silica flour：12.87%, magnesium：3.56%, iron powder：1.75%, nano-carbon powder：0.95%, boron：0.31%, titanium：
0.16%, chromium：0.48%, nitrogen：0.54%, trace additives：0.12%, less than or equal to 0.01%, remaining is Control of Impurities
Aluminium.
Wherein, the nitrogen in the aluminum alloy doorframe exists in the form of nitride.
Wherein, the nitride is at least one of titanium nitride, aluminium nitride and silicon nitride.
Wherein, the micro- addition element is at least one of yttrium, cerium, promethium, gallium, bismuth.
The present invention also provides the preparation processes of above-mentioned high-strength endurance aluminum alloy doorframe, include the following steps：
（1）Fine aluminium is added in resistance furnace, and furnace temperature is risen to 760-780 DEG C, after aluminium block thawing, is sequentially added in magnalium
Between alloy, aluminium titanium intermediate alloy, aluminium chromium hardener, aluminium boron intermediate alloy, after intermediate alloy completely melt after, agitating solution 2-
4min obtains aluminum alloy melt；
（2）Silica flour, iron powder, nano-carbon powder, nitrogen, trace element are worn into mix powder；
（3）By step（2）Mix powder is added in molten aluminium alloy liquid, and furnace temperature is risen to 830-850 DEG C, is sufficiently stirred
Uniformly, it is then allowed to stand heat preservation 30-50min, furnace temperature is down to 700 DEG C, high-purity argon gas degasification 10-15min is then used, skims, is protected
Temperature stands 10min, and furnace temperature is down to 600 DEG C again later, casts after skimming again, obtains aluminium alloy cast ingot；
（4）By step（3）In aluminium alloy cast ingot be put into homogenizing furnace and carry out homogenizing annealing processing；
（5）Aluminium alloy cast ingot base after Homogenization Treatments is preheated to 450-470 DEG C, then utilizes extruder by the casting after preheating
Base is put into extrusion molding in mold；
（6) by step（5）Aluminium alloy cast ingot is warming up to 320-340 DEG C by the aluminum alloy doorframe squeezed out under vacuum
Lower heat preservation 1-2h continues to be heated to 460 DEG C of 450-, keeps the temperature 40-50min, then water cooling is to 220-240 DEG C, then is air-cooled to room
Temperature.
（7）Ageing treatment for the first time is carried out to aluminum alloy doorframe again, is then kept the temperature, then carry out second of ageing treatment.
Wherein, step（2）In, further include that mix powder sieves with 100 mesh sieve.
Wherein, step（4）In, the homogenizing annealing processing：It first is warming up to 180-200 DEG C with 50-60 DEG C/h, keeps the temperature 3-
5h, then it is warming up to 360-380 DEG C with 30-40 DEG C/h, 4-6h is kept the temperature, then 460-480 DEG C is warming up to 50-60 DEG C/h, keeps the temperature 2-
Then 3h is cooled to 230-250 DEG C with 70-80 DEG C/h, keep the temperature 3-5h, then be warming up to 460-480 DEG C with 90-100 DEG C/h, heat preservation
Then 2-3h is cooled to 140-150 DEG C with 120-140 DEG C/h, keep the temperature 4-6h, be air-cooled to room temperature.
Wherein, step（5）In, the extruding rate is 3-5mm/min.
Wherein, step（7）In, the temperature of the ageing treatment for the first time is 140-150 DEG C, soaking time 9-11h；Second
Secondary aging treatment process is that temperature is 130-150 DEG C, soaking time 17-19h.
Embodiment 3
The high-strength endurance aluminum alloy doorframe of the present embodiment, by weight percentage, the high-strength endurance aluminum alloy doorframe contain
There is following element：Silica flour：9.45%, magnesium：2.05%, iron powder：1.25%, nano-carbon powder：0.70%, boron：0.22%, titanium：
0.11%, chromium：0.37%, nitrogen：0.44%, trace additives：0.08%, less than or equal to 0.01%, remaining is Control of Impurities
Aluminium.
Wherein, the nitrogen in the aluminum alloy doorframe exists in the form of nitride.
Wherein, the nitride is at least one of titanium nitride, aluminium nitride and silicon nitride.
Wherein, the micro- addition element is at least one of yttrium, cerium, promethium, gallium, bismuth.
The present invention also provides the preparation processes of above-mentioned high-strength endurance aluminum alloy doorframe, include the following steps：
（1）Fine aluminium is added in resistance furnace, and furnace temperature is risen to 760-780 DEG C, after aluminium block thawing, is sequentially added in magnalium
Between alloy, aluminium titanium intermediate alloy, aluminium chromium hardener, aluminium boron intermediate alloy, after intermediate alloy completely melt after, agitating solution 2-
4min obtains aluminum alloy melt；
（2）Silica flour, iron powder, nano-carbon powder, nitrogen, trace element are worn into mix powder；
（3）By step（2）Mix powder is added in molten aluminium alloy liquid, and furnace temperature is risen to 830-850 DEG C, is sufficiently stirred
Uniformly, it is then allowed to stand heat preservation 30-50min, furnace temperature is down to 700 DEG C, high-purity argon gas degasification 10-15min is then used, skims, is protected
Temperature stands 10min, and furnace temperature is down to 600 DEG C again later, casts after skimming again, obtains aluminium alloy cast ingot；
（4）By step（3）In aluminium alloy cast ingot be put into homogenizing furnace and carry out homogenizing annealing processing；
（5）Aluminium alloy cast ingot base after Homogenization Treatments is preheated to 450-470 DEG C, then utilizes extruder by the casting after preheating
Base is put into extrusion molding in mold；
（6) by step（5）Aluminium alloy cast ingot is warming up to 320-340 DEG C by the aluminum alloy doorframe squeezed out under vacuum
Lower heat preservation 1-2h continues to be heated to 460 DEG C of 450-, keeps the temperature 40-50min, then water cooling is to 220-240 DEG C, then is air-cooled to room
Temperature.
（7）Ageing treatment for the first time is carried out to aluminum alloy doorframe again, is then kept the temperature, then carry out second of ageing treatment.
Wherein, step（2）In, further include that mix powder sieves with 100 mesh sieve.
Wherein, step（4）In, the homogenizing annealing processing：It first is warming up to 180-200 DEG C with 50-60 DEG C/h, keeps the temperature 3-
5h, then it is warming up to 360-380 DEG C with 30-40 DEG C/h, 4-6h is kept the temperature, then 460-480 DEG C is warming up to 50-60 DEG C/h, keeps the temperature 2-
Then 3h is cooled to 230-250 DEG C with 70-80 DEG C/h, keep the temperature 3-5h, then be warming up to 460-480 DEG C with 90-100 DEG C/h, heat preservation
Then 2-3h is cooled to 140-150 DEG C with 120-140 DEG C/h, keep the temperature 4-6h, be air-cooled to room temperature.
Wherein, step（5）In, the extruding rate is 3-5mm/min.
Wherein, step（7）In, the temperature of the ageing treatment for the first time is 140-150 DEG C, soaking time 9-11h；Second
Secondary aging treatment process is that temperature is 130-150 DEG C, soaking time 17-19h.
Comparative example 1
Using aluminum alloy doorframe made from Chinese invention patent application 201510285971.X.
Comparative example 2
Using aluminum alloy doorframe made from Chinese invention patent application 201310687806.8.
Comparative example 3
In addition to no nitrogen, material content and preparation process are consistent with embodiment 1.
Comparative example 4
In addition to no trace additives, material content and preparation process are consistent with embodiment 1.
Experimental example 1
The production aluminium alloy of embodiment 1-3 and comparative example 1-4 is made to the mechanical endurance of 4mm diameters × 6mm long parallel zones
Property test piece.
The thermomechanical fatigue durability assessment of each sample is as follows：
Each of above-mentioned experiment is installed on the restrained beam made of low heat expansion alloy, and the repetition heated and cooled down follows
Ring.Ranging from 50 DEG C -250 DEG C of test temperature, recurrence rate is 5 minutes/period, is made of heating in 2 minutes and cooling in 3 minutes
That specifically tests the results are shown in Table 1.
Table 1
| Test event | Thermal fatigue life（Period） |
| Embodiment 1 | 6300 |
| Embodiment 2 | 6500 |
| Embodiment 3 | 6600 |
| Comparative example 1 | 4800 |
| Comparative example 2 | 5300 |
| Comparative example 3 | 6000 |
| Comparative example 4 | 6200 |
As shown in Table 1, the fatigue performance of aluminum alloy doorframe of the invention is superior to comparative example, and by comparative example 3,4 it is found that
By adding nitrogen, trace additives, the fatigue performance of aluminum alloy doorframe of the present invention can be further promoted.
Experimental example 2
The aluminium alloy of the aluminium alloy of embodiment 1-3 and comparative example 1-4 are subjected to Mechanics Performance Testing, concrete outcome is shown in Table 2.
Table 2
| Test event | Tensile strength（MPa） | Yield strength（MPa） | Elongation percentage（%） |
| Embodiment 1 | 445 | 378 | 15.5 |
| Embodiment 2 | 463 | 384 | 15.9 |
| Embodiment 3 | 481 | 397 | 16.6 |
| Comparative example 1 | 381 | 313 | 13.6 |
| Comparative example 2 | 402 | 326 | 14.5 |
| Comparative example 3 | 427 | 365 | 15.1 |
| Comparative example 4 | 413 | 334 | 14.8 |
As shown in Table 2, the mechanical property of aluminium alloy of the invention is superior to comparative example, and by adding nitrogen, micro adding
Added elements can further promote the mechanical property of aluminium alloy of the present invention.
In conclusion the creativeness of the present invention is mainly reflected in the following:
（1）The present invention is mutually compensated for by the content of optimization each component, and intensity is low during solving existing aluminium alloy use,
The characteristics of being easily deformed, and there is good impact resistance and endurance using aluminum alloy doorframe made of material of the present invention
Property, its service life is greatly improved, the generation of contingency is reduced.
（2）The present invention introduces nitride in aluminum alloy doorframe, improves aluminum alloy doorframe intensity, while nitride is stronger
Stability improves the fatigue performance of aluminum alloy doorframe.
（3）The present invention by adding a variety of alloying elements such as a small amount of yttrium, cerium, promethium, gallium, bismuth come crystal grain thinning, tie again by change
Crystalline state improves the elevated temperature strength and the performances such as endurance, wear-resisting, shock resistance of alloy.
（4）The present invention by casting, Homogenization Treatments, solution treatment, ageing treatment and etc. optimization, improve aluminium alloy
The intensity and fatigue performance of doorframe.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although with reference to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features.All essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (10)
1. a kind of high-strength endurance aluminum alloy doorframe, which is characterized in that by weight percentage, the high-strength endurance aluminium alloy
Doorframe contains following element：Silica flour：6.18-12.87%, magnesium：1.28-3.56%, iron powder：0.89-1.75%, nano-carbon powder：
0.56-0.95%, boron：0.12-0.31%, titanium：0.03-0.16%, chromium：0.26-0.48%, nitrogen：0.16-0.54%, it is micro
Addition element：0.005-0.12%, for Control of Impurities less than or equal to 0.01%, remaining is aluminium.
2. high-strength endurance aluminum alloy doorframe according to claim 1, which is characterized in that by weight percentage, described
High-strength endurance aluminum alloy doorframe contains following element：Silica flour：8.26-10.15%, magnesium：1.84-2.37%, iron powder：0.89-
1.75%, nano-carbon powder：0.56-0.95%, boron：0.12-0.31%, titanium：0.03-0.16%, chromium：0.31-0.43%, nitrogen：
0.38-0.50%, trace additives：0.005-0.12%, for Control of Impurities less than or equal to 0.01%, remaining is aluminium.
3. high-strength endurance aluminum alloy doorframe according to claim 1, which is characterized in that the nitrogen in the aluminum alloy doorframe
Element exists in the form of nitride.
4. high-strength endurance aluminum alloy doorframe according to claim 1, which is characterized in that the nitride be titanium nitride,
At least one of aluminium nitride and silicon nitride.
5. high-strength endurance aluminum alloy doorframe according to claim 1, which is characterized in that the trace element addition element
For at least one of yttrium, cerium, promethium, gallium, bismuth.
6. according to the preparation process of the high-strength endurance aluminum alloy doorframe of claim 1-5 any one of them, which is characterized in that packet
Include following steps：
（1）Fine aluminium is added in resistance furnace, and furnace temperature is risen to 760-780 DEG C, after aluminium block thawing, is sequentially added in magnalium
Between alloy, aluminium titanium intermediate alloy, aluminium chromium hardener, aluminium boron intermediate alloy, after intermediate alloy completely melt after, agitating solution 2-
4min obtains aluminum alloy melt；
（2）Silica flour, iron powder, nano-carbon powder, nitrogen, trace element are worn into mix powder；
（3）By step（2）Mix powder is added in molten aluminium alloy liquid, and furnace temperature is risen to 830-850 DEG C, is sufficiently stirred
Uniformly, it is then allowed to stand heat preservation 30-50min, furnace temperature is down to 700 DEG C, high-purity argon gas degasification 10-15min is then used, skims, is protected
Temperature stands 10min, and furnace temperature is down to 600 DEG C again later, casts after skimming again, obtains aluminium alloy cast ingot；
（4）By step（3）In aluminium alloy cast ingot be put into homogenizing furnace and carry out homogenizing annealing processing；
（5）Aluminium alloy cast ingot base after Homogenization Treatments is preheated to 450-470 DEG C, then utilizes extruder by the casting after preheating
Base is put into extrusion molding in mold；
（6) by step（5）Aluminium alloy cast ingot is warming up to 320-340 DEG C by the aluminum alloy doorframe squeezed out under vacuum
Lower heat preservation 1-2h continues to be heated to 460 DEG C of 450-, keeps the temperature 40-50min, then water cooling is to 220-240 DEG C, then is air-cooled to room
Temperature；
（7）Ageing treatment for the first time is carried out to aluminum alloy doorframe again, is then kept the temperature, then carry out second of ageing treatment.
7. the preparation process of high-strength endurance aluminum alloy doorframe according to claim 6, which is characterized in that step（2）In,
Further include that mix powder sieves with 100 mesh sieve.
8. the preparation process of high-strength endurance aluminum alloy doorframe according to claim 6, which is characterized in that step（4）In,
The homogenizing annealing processing：It first is warming up to 180-200 DEG C with 50-60 DEG C/h, keeps the temperature 3-5h, then be warming up to 30-40 DEG C/h
360-380 DEG C, 4-6h is kept the temperature, then 460-480 DEG C is warming up to 50-60 DEG C/h, keep the temperature 2-3h, then cooled down with 70-80 DEG C/h
To 230-250 DEG C, 3-5h is kept the temperature, then 460-480 DEG C is warming up to 90-100 DEG C/h, 2-3h is kept the temperature, then with 120-140 DEG C/h
It is cooled to 140-150 DEG C, 4-6h is kept the temperature, is air-cooled to room temperature.
9. the preparation process of high-strength endurance aluminum alloy doorframe according to claim 6, which is characterized in that step（5）In,
The extruding rate is 3-5mm/min.
10. the preparation process of high-strength endurance aluminum alloy doorframe according to claim 6, which is characterized in that step（7）
In, the temperature of the ageing treatment for the first time is 140-150 DEG C, soaking time 9-11h；Second of aging treatment process is temperature
It is 130-150 DEG C, soaking time 17-19h.
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