CN1570174A - Al-Mg-Si-Cu-Ti-Sr alloy and method for making same - Google Patents

Al-Mg-Si-Cu-Ti-Sr alloy and method for making same Download PDF

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Publication number
CN1570174A
CN1570174A CN 200410010234 CN200410010234A CN1570174A CN 1570174 A CN1570174 A CN 1570174A CN 200410010234 CN200410010234 CN 200410010234 CN 200410010234 A CN200410010234 A CN 200410010234A CN 1570174 A CN1570174 A CN 1570174A
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alloy
minute
aluminium liquid
prepare
methods
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CN 200410010234
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CN1301339C (en
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关绍康
卢广玺
陈海军
石广新
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郑州大学
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Abstract

The invention provides a Al-Mg-Si-Cu-Ti-Sr alloy for preparing car body plate. The alloy consists of Al, Mg, Si, Cu, Mn, Ti, and Sr, and the contents of the components (by weight) are as follows: Mg: 1.0-1.5%, S: 1.0-1.5%, Cu: 0.5-1.0%, Mn: 0.1-0.6%, Ti: 0.1-0.3%, Sr: 0.01-0.1%, Al: the rest. The invention also provides the preparing method, characterized by preparing Al-Si-Ti alloy and other required elements by direct electrolytic method. The alloy plate provided by the invention has improved mechanical property and shaping property.

Description

The Al-Mg-Si-Cu-Ti-Sr Alloy And Preparation Method
Affiliated field
The invention belongs to Al-Mg-Si base alloy material technical field, be specifically related to the Al-Mg-Si-Cu-Ti-Sr Alloy And Preparation Method.
Background technology:
At present, car body panel commonly used mainly contains Al-Cu-Mg base (2000 are) with aluminium alloy, Al-Mg base (5000 are) Al-Mg-Si base (6000 are) alloy.Wherein but 2000 are and 6000 be to be the thermal treatment reinforced alloys, and 5000 is to be that thermal treatment can not reinforced alloys.2000 is that the Al-Cu-Mg alloy has good forging, high intensity and good welding property, but its corrosion stability is relatively poor.5000 is Al-Mg base alloy, its intensity, forming property and against corrosion all better, but its castability is relatively poor, and have delayed yield, and for thermal treatment can not reinforced alloys.6000 is the Al-Mg-Si alloy, has suitable intensity and forming property, and is heat-treatable strengthened alloy, and therefore, the aluminium alloy that is used for car body panel mainly concentrates on 6000 aluminium alloys that are.
Be applied to 6000 of car body panel the earliest and be alloy designations and be 6009, be 6010 and 6111 afterwards, its composition is as shown in the table:
Alloy designations ????Si ?????Mg ??????Cu ?????Mn ???Fe ???Zn ???Cr ???Ti
?6009 ?6010 ?6111 ?pa1 ?pa2 ??0.6-1.0 ??0.8-1.2 ??0.6-1.1 ??0.6-1.5 ??0.8-1.5 ??0.4-0.8 ??0.6-1.0 ??0.5-1.0 ??0.5-1.4 ??0.4-0.7 ???0.15-0.60 ???0.15-0.60 ???0.5-0.9 ???<0.10 ???0.5-0.8 ??0.2-0.8 ??0.2-0.8 ??<0.40 ??<0.10 ??<0.20 ?<0.50 ?<0.50 ?<0.40 ?<0.30 ?<0.30 ?<0.25 ?<0.25 ?<0.25 ?<0.20 ?- ?<0.1 ?<0.1 ?<0.1 ?<0.1 ?<0.1 ?<0.1 ?<0.1 ?<0.1 ?<0.1 ?<0.1
As can be seen from the table, 6009 adopt lower Si and Mg, and Si and Mg slightly increase in 6010 and 6111, and three kinds of alloys all adopt lower Ti.Pa1 is that (patent No. is 4909861 for the United States Patent (USP) of applications such as Muraoka, on March 20th, 1900) automobile board, its composition is low copper, contains the zirconium and the vanadium of trace, its tensile strength and yield strength and 6009 grades, but have welding property, Corrosion Protection and forming property preferably.Pa2 is United States Patent (USP) (patent No. on October 8th, 6461454, the 2002) automobile board of application such as Tawara, and its Si content increases, and obtains anti-corrosion performance preferably.But the mechanical property of both alloys is low slightly, and forming property is not high yet.
6000 line aluminium alloys mainly contain following element: Mg, Si, Cu, Mn, Ti etc., and each element is not isolated working, and its influence is concerned with.
Mg, Si are the most important alloying elements of 6000 line aluminium alloys.They can form Mg when timeliness 2Si, after the solution hardening ageing treatment, tiny precipitated phase disperse is distributed on the matrix, has effectively improved performance.Si can improve flowability, the wear resistance of casting, and when Si content is low excessively, alloy does not reach sufficient intensity, and when the Si too high levels, the Alloy Forming variation is so be decided to be 1.0-1.5wt% with the content of Si.Mg makes alloy that heat treatment capacity be arranged, and can make alloy keep good corrosion stability and weldability simultaneously, and the content of Mg is decided to be 1.0-1.5wt%.
Cu also makes 6000 to be strengthening element important in the alloy.Cu can improve hardness of alloy, improves alloy strength, fatigue property and creep property.When Cu<0.5wt%, a little less than its effect, as Cu>1.0wt%, car body panel is when bonderizing, and Cu easily is enriched in the plate surface, reduces the corrosion stability of alloy, so Cu content is decided to be 0.5-1.0wt%.
Mn is used for and the deleterious effect of Fe in wrought aluminium alloy, the low raising that helps performance of the high Fe of Mn, but Mn Tai Gaoyi segregation, and Mn content is 0.3-0.5wt%.
Ti is the organic composition operation of grain refining in the aluminum current alloy material, and thinning effect is good.When Ti content is too high, TiAl 3Easily segregation is bigger to normal temperature strength and toughness influence.Report both at home and abroad that at present 6000 is in the Al-Mg-Si alloy, Ti content is all less than 0.20wt%.
Sr is a kind of good alterant.In the Al-Si casting alloy, more and more used.It is rotten to add Sr in 6000 line aluminium alloys, flaky β-AlFeSi can be changed into the α-AlFeSi of Chinese printed words." phase needle-like shortens, β, and " phase density increases, and significantly increases tensile strength of alloys, yield strength and unit elongation simultaneously to make β.The Sr add-on can cause not exclusively and go bad very little, adds too much, then the modification effect variation.The Sr add-on is 0.010-0.10wt% among the present invention.
Summary of the invention:
The object of the present invention is to provide a kind of Al-Mg-Si-Cu-Ti-Sr car body panel alloy material, a kind of method for preparing this alloy is provided simultaneously with favorable mechanical performance and forming property.
Technical scheme of the present invention is:
A kind of Al-Mg-Si-Cu-Ti-Sr alloy, mainly elementary composition by Al, Mg, Si, Cu, Mn, Ti, Sr etc., the massfraction of its each component is:
Mg??????1.0-1.5%
Si??????1.0-1.5%
Cu??????0.5-1.0%
Mn??????0.1-0.6%
Ti??????0.1-0.3%
Sr??????0.01-0.1%
Refining agent 1-1.5%
The Al surplus
The preferred version of above-mentioned Al-Mg-Si-Cu-Ti-Sr alloy each component massfraction is:
Mg??????1.0-1.3%
Si??????1.0-1.3%
Cu??????0.6-0.9%
Mn??????0.3-0.46%
Ti??????0.15-0.25%
Sr??????0.015-0.09%
Refining agent 1-1.5%
The Al surplus
Prepare the method for above-mentioned Al-Mg-Si-Cu-Ti-Sr alloy, the steps include:
A. according to the given massfraction of claim, earlier Al-10Mn alloy and part A l-Ti-Si alloy being put into stove heats up, furnace temperature increases 900-1000 ℃, treat to add remaining Al-Ti-Si, Al-50Cu alloy again behind the alloy melting, treat whole alloy meltings, add the Al-10Sr alloy, be fused into aluminium liquid;
B. reduce temperature of aluminum liquid to 750-800 ℃, in aluminium liquid, add the Mg piece, stir,, be pressed in the aluminium liquid with bell jar then, do the to-and-fro movement of horizontal direction, refining 2-10 minute, skim the refining agent aluminium foil packing;
C. solution temperature rises to 750-780 ℃, and the binary fining agent that will account for aluminium liquid weight 1-5% with bell jar is pressed into aluminium liquid, keeps 2-15 minute;
D. open argon gas earlier, the graphite rotator with degasifying device immerses in the aluminium liquid then, and motor speed is 200-350 rev/min, when bubble exceeds liquid level 20-40mm, keeps 2-10 minute;
E. make solution temperature remain on 750-780 ℃, left standstill 10-30 minute, the back cast of skimming promptly gets product.
Among the above-mentioned preparation method: employed Al-Ti-Si alloy is that direct electrolysis obtains, and its composition is Ti0.15-0.25%, Si1.0-1.5%, and surplus is Al; Used refining agent is KNO 3+ Graphite Powder 99, its weight ratio are KNO 3: Graphite Powder 99=(25-35): 1; Middle alloy A l-Si-Ti, the Al-50Cu that adds, the preheating temperature of Al-10Sr, Mg are 150-180 ℃, and be 0.5-2 hour warm up time; Used binary fining agent is Al-5Ti-C.
Compared with prior art, the invention has the advantages that:
1, invention is to add Sr in the vehicle body plate to make fining agent 6000 first, has improved the mechanical property and the forming property of alloy.
2, on the high Si of high Mg basis, add more Cu and Ti, when improving alloy mechanical performance, obtain forming property preferably.
3, China's bauxite resource is abundant, and bauxitic clay titaniferous amount is higher.Employed Al-Si-Ti alloy is direct electrolysis method production among the present invention, both made full use of the beneficial effect of titanium, remove Si, Ti when having simplified aluminium metallurgy again, the loaded down with trivial details technology that adds Si, Ti during gold conjugate, and the low-titanium aluminum alloy that adopts direct electrolysis method to produce, alloy structure is even, stable components, flow process is short, low, the reduced in segregation of cost, homogeneous microstructure.
4, the present invention adopts Al-5Ti-C to carry out refinement, crystal grain thinning preferably as the aluminium alloy fining agent.
Specific implementation method:
Embodiment 1:
With 10 #Alloy is example (alloying constituent wt%, Mg 1.27%, Si 1.24%, Cu 0.85%, Mn0.43%, Ti 0.20%, Sr 0.015%)
Prepare:
Mould adopts metal mold 45mm * 200mm * 350mm.Mould inner wall, funnel inwall are skimmed and refining instrument rust cleaning and being coated with high-al clay coating; Metal type dies is preheated to 150-200 ℃ (measurement of surface temperature measurement instrument), and funnel is preheated to 180-200 ℃, puts into mould when to be cast immediately.
With intermediate preheating alloy A l-50Cu, Al-10Sr, Mg, 150-180 ℃ preheating 0.5-1 hour.
Use KNO 3+ Graphite Powder 99 (weight ratio 30: 1) is as refining agent, under 150-200 ℃ of temperature preheating 1-2 hour.
Melting:
With the Al-10Mn alloy, about 2/3 Al-Si-Ti alloy is put into crucible and is heated up with stove, and furnace temperature increases 900-1000 ℃, and it is very fast to make it Heating temperature, and all the other alloys to be added are placed on the fire door preheating.Treat to add all the other Al-Si-Ti alloys and Al-50Cu alloy in the crucible behind the alloy melting, treat that whole alloy meltings are complete, add the Al-10Sr alloy, be fused into aluminium liquid;
Reduce temperature of aluminum liquid, when temperature is 770-780 ℃, crucible tongs is gone out,, stir to the MAG block of aluminium liquid adding through oil removing, oven dry with anchor clamps; With the refining agent aluminium foil packing of 1.2wt%, be pressed in the aluminium liquid with bell jar then, about 100mm place apart from the bottom, the mobile bell jar that blows slowly is done the cyclotron motion of horizontal direction, refining time 2-3 minute, skims;
Again crucible is put into stove and heat up, treat that temperature is raised to 770-780 ℃, the Al-5Ti-C binary fining agent that will account for aluminium liquid weight 2-3% with bell jar is pressed into aluminium liquid, keeps 3-5 minute;
Ar pressure transfers to 0.1-0.2MPa, opens argon gas earlier, degasifying device is lifted graphite rotator is immersed in the aluminium liquid, and motor speed is 240-300 rev/min, and bubble exceeds liquid level 25-30mm, keeps 2-3 minute;
Keeping solution temperature is 750-780 ℃, leaves standstill 15-20 minute, takes out crucible, and the back cast of skimming promptly makes the Al-Mg-Si-Cu-Ti-Sr alloy.
Cast:
The funnel that preheating is good is put into mould, opens filtering net on the funnel, keeps casting ladle and funnel top 30-35cm, and the duration of pouring is less than 1 minute, 770 ℃ of teeming temperatures.
Rolled plate:
Strand carries out homogenizing thermal treatment before rolling, the homogenizing treatment process is: strand heats with stove, is heated to 520-540 ℃, is incubated 1-12 hour;
Strand heats before hot rolling, and Heating temperature 520-540 ℃, be incubated 1-1.5 hour, hot rolling divides four-pass to carry out, and every time attenuate amount is 40-50%, and hot rolling finishing temperature is not less than 290 ℃, and strand finish to gauge thickness is 3.4-3.8mm;
Sheet material carries out cold rollingly after the hot rolling, and cold rolling branch three passages are carried out, and every time attenuate amount 30-40% is rolled to 1mm with sheet material together at last;
Sheet material after cold rolling is carried out solution hardening, and its heat treating regime is: solid solubility temperature 540-550 ℃, soaking time 30-35 minute, water medium quenched;
Sheet material after the quenching carries out ageing treatment, and system of ageing treatment is: 150-175 ℃, soaking time 5-8 minute, naturally cool to room temperature then.
Mechanical property and forming property detect and show that the 10# tensile strength of alloys is 353MPa, and yield strength is 198MPa.N value 0.30, r value 0.73.
Embodiment 2:
With 11 #Alloy is example (alloying constituent wt%, Mg 1.02%, Si 1.15%, Cu 0.71%, Mn0.46%, Ti 0.19%, Sr 0.033%).
Its preparation and fusion process are with embodiment 1.
Rolled plate:
The rolling more capable homogenizing thermal treatment of advancing of strand, the homogenizing treatment process is: strand heats with stove, is heated to 500-520 ℃, is incubated 8-9 hour;
Strand heats before hot rolling, and Heating temperature 500-520 ℃, be incubated 1-2 hour, hot rolling divides four-pass to carry out, and every time attenuate amount is 40-50%, and hot rolling finishing temperature is not less than 290 ℃, and strand finish to gauge thickness is 3.4-3.5mm;
Sheet material carries out cold rollingly after the hot rolling, and cold rolling branch three passages are carried out, and every time attenuate amount 30-40% is rolled to 1mm with sheet material together at last;
Sheet material after cold rolling carries out solution hardening, and its heat treating regime is: solid solubility temperature 530-540 ℃, soaking time 30-40 minute, water medium quenched;
Sheet material after the quenching carries out ageing treatment, and system of ageing treatment is: 140-150 ℃, soaking time 5-8 minute, naturally cool to room temperature then.
Mechanical property and forming property detect and show 11 #The performance of alloy is tensile strength 347MPa, yield strength 195MPa, n value 0.27, r value 0.70.
Embodiment 3:
With 15 #Alloy is example (alloying constituent wt%, Mg 1.08%, Si 1.05%, Cu 0.73%, Mn0.42%, Ti 0.16%, Sr 0.09%).
Its preparation and fusion process are with embodiment 1.
Rolled plate:
The rolling more capable homogenizing thermal treatment of advancing of strand, the homogenizing treatment process is: strand heats with stove, is heated to 480-500 ℃, is incubated 7-8 hour;
Strand heats before hot rolling, and Heating temperature 500-510 ℃, be incubated 1-1.5 hour, hot rolling divides four-pass to carry out, and every time attenuate amount is 40-50%, and hot rolling finishing temperature portion is lower than 290 ℃, and strand finish to gauge thickness is 3.7-3.8mm;
Sheet material carries out cold rollingly after the hot rolling, and cold rolling branch three passages are carried out, and every time attenuate amount 30-40% is rolled to 1mm with sheet material together at last;
Sheet material after cold rolling carries out solution hardening, and its heat treating regime is: solid solubility temperature 500-510 ℃, soaking time 30-35 minute, water medium quenched;
Sheet material after the quenching carries out ageing treatment, and system of ageing treatment is: 140-145 ℃, soaking time 8-10 minute, naturally cool to room temperature then.
Mechanical property and forming property detect and show that the performance of 15# alloy is tensile strength 310MPa, yield strength 170MPa, n value 0.28, r value 0.71.
Following table is the comparison of the present invention and existing several alloy mechanical performances and forming property:
The alloy numbering   σ bMPa    σ 0.2MPa      n      r
10 # 11 # 15 # 6009 6010 6111 pal    353    347    310    234    296    290    290      198      195      186      131      186      150      170     0.30     0.27     0.28     0.23     0.22     0.28     /     0.73     0.70     0.71     0.70     0.70     0.70     /
As can be seen from the above table: 10#Strength of alloy is higher by 51% than 6009 alloys, high 51 % of yield strength, and higher by 21% than 6010 strength of alloy alloys, yield strength is high by 30%. Characterize index n, the r value of forming property, alloy of the present invention also is better than other several alloys. Show that alloy of the present invention has more superior mechanical performance and forming property.

Claims (8)

1, a kind of Al-Mg-Si-Cu-Ti-Sr alloy, mainly elementary composition by Al, Mg, Si, Cu, Mn, Ti, Sr etc., it is characterized in that: the massfraction of each component is:
Mg??1.0-1.5%
Si??1.0-1.5%
Cu??0.5-1.0%
Mn??0.1-0.6%
Ti??0.1-0.3%
Sr??0.01-0.1%
Refining agent 1-1.5%
The Al surplus
2, according to the described Al-Mg-Si-Cu-Ti-Sr alloy of claim 1, it is characterized in that: the each component massfraction preferably be:
Mg??1.0-1.3%
Si??1.0-1.3%
Cu??0.6-0.9%
Mn??0.3-0.46%
Ti??0.15-0.25%
Sr??0.015-0.09%
Refining agent 1-1.5%
The Al surplus
3, a kind of method for preparing the Al-Mg-Si-Cu-Ti-Sr alloy is characterized in that:
A. according to the given massfraction of claim, earlier Al-10Mn alloy and part A l-Ti-Si alloy being put into stove heats up, furnace temperature increases 900-1000 ℃, treat to add remaining Al-Ti-Si, Al-50Cu alloy again behind the alloy melting, treat whole alloy meltings, add the Al-10Sr alloy, be fused into aluminium liquid;
B. reduce temperature of aluminum liquid to 750-800 ℃, in aluminium liquid, add the Mg piece, stir,, be pressed in the aluminium liquid with bell jar then, do the to-and-fro movement of horizontal direction, refining 2-10 minute, skim the refining agent aluminium foil packing;
C. solution temperature rises to 750-780 ℃, and the binary fining agent that will account for aluminium liquid weight 1-5% with bell jar is pressed into aluminium liquid, keeps 2-15 minute;
D. open argon gas earlier, the graphite rotator with degasifying device immerses in the aluminium liquid then, and motor speed is 200-350 rev/min, when bubble exceeds liquid level 20-40mm, keeps 2-10 minute;
E. make solution temperature remain on 750-780 ℃, left standstill 10-30 minute, the back cast of skimming promptly gets product.
4, according to claims 3 described methods that prepare the Al-Mg-Si-Cu-Ti-Sr alloy, it is characterized in that: the composition of used Al-Si-Ti alloy is: Si 1.0-1.5wt%, Ti 0.15-0.25wt%.
5, according to claims 3 described methods that prepare the Al-Mg-Si-Cu-Ti-Sr alloy, it is characterized in that: used Al-Si-Ti alloy is that direct electrolysis obtains.
6, according to claims 2 described methods that prepare the Al-Mg-Si-Cu-Ti-Sr alloy, it is characterized in that: refining agent is KNO 3+ Graphite Powder 99, weight ratio are KNO 3: Graphite Powder 99=(20-35): 1.
7, according to claims 3 described methods that prepare the Al-Mg-Si-Cu-Ti-Sr alloy, it is characterized in that: middle adding alloy A l-Si-Ti, Al-50Cu, Al-10Sr and the first preheating before adding of Mg piece, preheating temperature is 150-200 ℃, and the time is 0.5-2 hour.
8, according to claims 3 described methods that prepare the Al-Mg-Si-Cu-Ti-Sr alloy, it is characterized in that: used binary fining agent is Al-5Ti-C.
CNB2004100102340A 2004-04-28 2004-04-28 Al-Mg-Si-Cu-Ti-Sr alloy and method for making same CN1301339C (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100453671C (en) * 2006-12-12 2009-01-21 苏州有色金属加工研究院 Al-Mg-Si-Cu alloy for automobile and its production process
CN103103400A (en) * 2012-12-11 2013-05-15 芜湖恒坤汽车部件有限公司 Smelting preparation method for anti-cracking aluminum alloy section bar
CN103526087A (en) * 2013-11-05 2014-01-22 张家港市昊天金属科技有限公司 Aluminum alloy and manufacturing method thereof
CN103556006A (en) * 2013-11-05 2014-02-05 张家港市昊天金属科技有限公司 Aluminum alloy and manufacturing method thereof
CN103556009A (en) * 2013-11-05 2014-02-05 张家港市昊天金属科技有限公司 Magnesium-aluminum alloy and manufacturing method thereof
CN104561704A (en) * 2015-02-09 2015-04-29 辽宁忠旺集团有限公司 Process for producing large-size 7055 aluminum alloy round ingot
CN109082494A (en) * 2018-09-14 2018-12-25 商洛市德新冶金材料有限公司 A method of utilizing high purity ferrosilicon powder production silicon strontium alloy
CN109628804A (en) * 2018-12-06 2019-04-16 佛山市三水凤铝铝业有限公司 A kind of high-strength aluminum alloy and preparation method thereof with excellent oxidation effect

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1171623A (en) * 1997-08-28 1999-03-16 Nippon Steel Corp Aluminum alloy sheet for automotive body panel and its production

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100453671C (en) * 2006-12-12 2009-01-21 苏州有色金属加工研究院 Al-Mg-Si-Cu alloy for automobile and its production process
CN103103400A (en) * 2012-12-11 2013-05-15 芜湖恒坤汽车部件有限公司 Smelting preparation method for anti-cracking aluminum alloy section bar
CN103526087A (en) * 2013-11-05 2014-01-22 张家港市昊天金属科技有限公司 Aluminum alloy and manufacturing method thereof
CN103556006A (en) * 2013-11-05 2014-02-05 张家港市昊天金属科技有限公司 Aluminum alloy and manufacturing method thereof
CN103556009A (en) * 2013-11-05 2014-02-05 张家港市昊天金属科技有限公司 Magnesium-aluminum alloy and manufacturing method thereof
CN104561704A (en) * 2015-02-09 2015-04-29 辽宁忠旺集团有限公司 Process for producing large-size 7055 aluminum alloy round ingot
CN109082494A (en) * 2018-09-14 2018-12-25 商洛市德新冶金材料有限公司 A method of utilizing high purity ferrosilicon powder production silicon strontium alloy
CN109628804A (en) * 2018-12-06 2019-04-16 佛山市三水凤铝铝业有限公司 A kind of high-strength aluminum alloy and preparation method thereof with excellent oxidation effect

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