The production method of high strength Al-Zn alloy and this alloy product
The application is be on April 9th, 2004, denomination of invention the applying date for the application number of " production method of high strength Al-Zn alloy and this alloy product " be the dividing an application of patent application of 200480009567.X.
The present invention relates to the malleable high strength Al-Zn alloy with improvement solidity to corrosion and toughness combination according to claim 1, production method with malleable high strength Al-Zn alloy of improvement solidity to corrosion and toughness combination according to claim 9, and the plate product of the optional this alloy of producing according to this method.More specifically, the present invention relates to adopt aluminium association about the malleable high strength Al-Zn alloy of 7000-series of the international nomenclature name of structure aerospace applications.Even more specifically, the present invention relates to have improved strength, the new chemical composition range of the Al-Zn alloy of toughness and solidity to corrosion combination, it does not need special timeliness or temper.
People know and are relating in relative high strength, high tenacity and corrosion proof many application in this technical field, for example use heat treatable aluminium alloy in airframe, vehicle component and other are used.Aluminium alloy AA7050 and AA7150 show high strength in the tempering of T6-type, for example referring to US-6, and 315,842.In addition, the AA7x75 that separates out-harden, AA7x55 alloy product show intensity values in the T6 tempering.People know that the T6 tempering can improve alloy strength, and wherein above-mentioned AA7x50, AA7x75 and the AA7x55 alloy product that contains a large amount of zinc, copper and magnesium is known because of its high strength-to-weight ratio, and therefore are applied in airplane industry especially.Yet these application cause contacting with various weather condition, therefore need strict controlled working and aging condition so that suitable intensity and solidity to corrosion to be provided, and comprise that counter stress corrodes and degrade both solidity to corrosions.
In order to improve stress corrosion resistant and anti-degrading property and fracture toughness property, people know that these AA7000-series alloys are manually carried out overaging to be processed.When artificial aging is processed T79, T76, T74 or the tempering of T73-type, their stress corrosion resistant, anti-degrade corrodibility and fracture toughness property improves (T73 is best, and T79 is close to T6) according to described order, sacrificed intensity but compare with the T6 tempered condition.A kind of acceptable tempered condition is the T74-type tempering of the limited overaging condition between T73 and T76, in order to reach tensile strength, anticorrosion stress-resistant, the anti-acceptable level that degrades corrodibility and fracture toughness property.By alloy product was processed 6-24 hour and approximately carried out such T74 tempering in 14 hours under 171 ℃ in 121 ℃ of lower overaging of temperature.
According to the standard of particular aircraft part, even on intensity, toughness or solidity to corrosion, little improvement also can cause weight saving, this will change into the interior fuel oil saving of time limit of service of aircraft.In order to satisfy these requirements, developed the alloy of several other 7000-train types:
EP-0377779 discloses a kind of improved production method that is used for 7055 alloys of sheet applications (the top wing member that for example has high tenacity and good corrosive nature) in aerospace field, the method comprises the steps: the base substrate with following composition is processed, in % by weight:
Zn:7.6-8.4
Cu:2.2-2.6
Mg:1.8-2.1,
Be selected from one or more following elements:
Zr:0.5-0.2
Mn:0.05-0.4
V:0.03-0.2
Hf:0.03-0.5,
The total amount of described element is no more than 0.6 % by weight, and the aluminium of surplus adds incidental impurities; Described product is carried out solution heat treatment and quenching, and or heat product to one or more temperature of 79 ℃ to 163 ℃ by continuous three times, perhaps at first such product is heated to one or more temperature of 79 ℃ to 141 ℃ more than two hours or two hours, or heat product to one or more temperature of 148 ℃ to 174 ℃, this product is carried out artificial aging process.These products demonstrate " EB " or better anti-the degrading property of improvement, and the corresponding object of the AA7x50 of its yield strength ratio similar size under the T76-tempered condition is high by approximately 15%.The corresponding object of the 7x50-T77 of their similar sizes of their strength ratio is still high at least about 5% (this paper below will use AA7150-T77 as the reference alloy).
US-5,312,498 disclose the method for another kind of production aluminium-Ji alloy product, and this alloy product has improved anti-degrading property and fracture toughness property, has balanced zinc, copper and magnesium level, so that there is no excessive copper and magnesium.The production method of this aluminium-Ji alloy product has adopted a step or two step ageing treatment, and balanced in conjunction with the stoichiometry of copper, magnesium and zinc.Two step timeliness operations are disclosed, wherein at first about 121 ℃ of these alloys of ageing treatment approximately 9 hours, then by second timeliness step approximately 157 ℃ approximately 10-16 hour, air cooling subsequently.Such statutes of limitations are for the light sheet products that is used for lower wing, covering application or fuselage skin.
US-4,954,188 disclose a kind of method that aldural is provided, and it is characterized in that using anti-the degrading property of improvement of the alloy that is comprised of following alloying element, in % by weight:
Zn:5.9-8.2
Cu:1.5-3.0
Mg:1.5-4.0
Cr:<0.04,
Total amount is less than other element of 0.5 for example zirconium, manganese, iron, silicon and titanium, surplus is aluminium, this alloy is processed into the product of predetermined shape, the reshaping product is carried out solution heat treatment, quenching, and to this thermal treatment and quenching product at by the temperature of 132 ℃ to 140 ℃ ageing treatment 6-30 hour.By reducing aging temp rather than picture US-3 for example in the past, the rising temperature of instructing in 881,966 or US-3,794,531 can obtain high strength, high tenacity and the high corrosion resistance of needs in this alloy.
Once reported, known separating out under the T6 tempered condition-hardening aluminum alloy AA7075 and other AA7000-series alloy can not provide enough solidity to corrosions under certain conditions.Yet compare with the T6 condition, the T7-type tempering that improves these Alloy Anti stress corrosion crack character significantly reduces intensity.
Therefore US-5,221,377 disclose basically by about 7.6-8.4 % by weight Zn, approximately 1.8-2.2 % by weight Mg and the about alloy product that forms of 2.0-2.6 % by weight Cu.The yield strength ratio of alloy product has excellent toughness and the corresponding goods of corrosion proof 7x50-T6 are high by approximately 10% like this.It is reported that yield strength surpasses 579MPa, and have " EC " or better anti-degrading property (EXCO) level.
US-5,496,426 disclose as US-5, and 221, disclosed alloy in 377, and a kind of method, the method comprise hot bundle, annealing and cold rolling, and it is 20% to 70% that preferred shrinkage subtracts scope, preferably, correspondingly carry out controlled annealing, thereby demonstrate the performance that is better than the AA7075-T6 performance.Although AA7075-T6 does not test (the SCC resistance of 40 days in the 35%NaCl alternating immersion test) by anti-stress corrosiveness under 138MPa, disclosed processing alloy has 241MPa SCC drag.
US-5, 108, 520 and US-4, 477, 292 disclose a kind of technique of the precipitation-hardening metal alloy of solid solution-Re-processing being carried out timeliness, this technique comprises three step timeliness, comprise that (1) is being significantly higher than room temperature but at lower than one or more temperature of 163 ℃, this alloy aging is processed significantly lower than the peak value yield strength, (2) then approximately at one or more temperature of 190 ℃, this alloy is being carried out ageing treatment, in order to improve the solidity to corrosion of this alloy, after this (3) are being significantly higher than room temperature but at lower than one or more temperature of 163 ℃, this alloy is carried out ageing treatment, improve yield strength.The product that obtains demonstrates good strength characteristics and good corrosive property.But this three steps statutes of limitations trouble is difficult to carry out simultaneously, and the cost of therefore producing this alloy increases.
Therefore, the purpose of this invention is to provide a kind of improvement Al-Zn alloy that is preferred for plate product, this alloy has toughness and the corrosive property balance of high strength and improvement.More specifically, the purpose of this invention is to provide a kind of alloy, it can be used for having the top wing application of improvement compression yield strength in aerospace, and this alloy property is better than the performance of the conventional AA7055-alloy under the T77 tempering.
Another object of the present invention is to provide the AA7000-series alloys, and this alloy shows intensity and interior toughness and the corrosion resisting property of T73-type tempering range in T6-type tempering range.
In addition, an object of the present invention is to provide a kind of alloy, this alloy can be used for timeliness-creep forming technique, and it is a kind of alloy that does not need complexity or trouble aging technique.
The present invention has many preferred purposes.
Utilize feature claimed in claim 1 can reach above-mentioned purpose of the present invention.Describe in the dependent claims and describe in detail other preferred implementation.Define the preferred method of producing this alloy in claim 9, and require and described various plate products in claim 14 and corresponding subordinate-claim.
Should be understood that hereinafter, unless otherwise noted, alloy nomenclature and timeliness title mean the ABAL's title in US aluminum all Aluminum Standards and Data and the Registration Records that deliver of association.Unless otherwise noted, all percentage ratios are all weight percentage.
Use has the high strength Al-Zn alloy product of improvement solidity to corrosion and toughness combination can realize above-mentioned purpose of the present invention, and this alloy mainly comprises (in % by weight):
Zn is 6.0-9.5 approximately
Cu is 1.3-2.4 approximately
Mg is 1.5-2.6 approximately
Mn<0.12
Zr<0.20, and preferred 0.05-0.15
Cr<0.10
Fe<0.25, and preferred<0.12
Si<0.25, and preferred<0.12
Ti<0.10
Hf and/or V<0.25, and
Ce and/or Sc<0.20 alternatively, especially in the 0.05-0.15 scope, other each element is all lower than 0.05, and total amount is lower than 0.25, surplus is aluminium, wherein (by weight percentage):
0.1[Cu]+1.3<[Mg]<0.2[Cu]+2.15,
And preferred 0.2[Cu]+1.3<[Mg]<0.1[Cu]+2.15.
When being processed into the sheet products that preferably can be used for the application of aerospace top wing, such chemical composition range of AA7000-series alloy shows fabulous performance.
Do not use above-mentioned trouble and complicated T77 timeliness circulation time, above-mentioned chemical constitution have with the T77-tempering under existing AA7x50 or the quite or better character of AA7x55 series alloy.The aluminium product that this chemical constitution obtains not only has good cost, and production is also simpler, because need procedure of processing still less.In addition, this chemical constitution allows to use new production technology, can not carry out the timeliness creep forming during as use T77-tempering alloy.Even better, previously defined chemical constitution timeliness can be become the T77-tempering, wherein compare with two step timeliness operations described below, solidity to corrosion also is improved, and has wherein especially improved the Peeling Corrosion characteristic.
By the present invention, when having found to use the particular combination of the Mg of relatively large Zn and specified range and Cu, the list of elements of selected scope reveals significantly better intensity, toughness and corrosive property combination, for example anti-degrading property and stress corrosion dehiscence resistant.
To have reported in order improving and to have degraded and the stress corrosion crack performance, copper content should keep highlyer, preferably higher than about 2.2 % by weight, it is reported and uses relatively low zinc content can reach better intensity and density combinations.
But, in the present invention, found that the relation that improves the zinc amount and optimize magnesium and copper can obtain better intensity, keep simultaneously good corrosive property and the toughness that is better than conventional T77-tempering alloy.Therefore, when advantageously not containing any manganese, the total content scope of zinc, magnesium and copper is about 11.50-12.50 (in % by weight), and when manganese is arranged, lower than 11.00, this moment, manganese was preferably 0.06-0.12 (in % by weight).
The preferred amounts of magnesium is 0.2[Cu]+1.3<[Mg]<0.1[Cu]+2.15, more preferably 0.2[Cu]+1.4<[Mg]<0.1[Cu]+1.9.The scope of copper is about 1.5-2.1, and more preferably 1.5 to lower than 2.0.The balance of magnesium and copper is important for chemistry of the present invention.
Copper and magnesium are the important elements that improves alloy strength.The too low meeting of the amount of magnesium and copper causes strength decreased, yet the too high meeting of the amount of magnesium and copper makes the corrosive property of alloy product lower, also can cause the weldability problem of alloy product.Prior art adopt specific timeliness operation to improve intensity and use a small amount of magnesium and copper in order to obtain good corrosive property.In order to reach the inner feelings of tearing open of intensity, toughness and corrosive property, the amount (take % by weight) of having found copper and magnesium approximately 1.5-2.3 can provide good balance as thick alloy product.But this corrosive property is vital parameter for thin alloy product, therefore must use copper and the magnesium of small amount, thereby produces lower intensity.In the present invention's whole chemical constitutions required for protection, might reach now the strength level in T6-tempering alloys range, keep simultaneously and corrosive nature characteristic like T74-tempering alloy type.
Except the amount of magnesium and copper, the invention discloses the amount of magnesium and copper and the balance of zinc, particularly make this alloy have the balance of magnesium and the zinc of these performance characteristics.The improvement solidity to corrosion of alloy of the present invention has EB or better, preferred EA or the better anti-performance (" EXCO ") of degrading.
These degrade performance according to stress corrosion dehiscence resistant (" SCC ") and anti-degrading property (" EXCO ") standard test, become at present AA7075, AA7050 and the AA7150-product of T73, T74 and T76 tempering for ageing treatment, and typical T6 tempering property needs.In order to determine whether commercial alloys satisfies the SCC standard, make the test sample of appointment stand the effect of predetermined test conditions.Allow bar-shaped sample stand such circulation: flooded in the 3.5%NaCl aqueous solution 10 minutes, then dry air is 50 minutes, stretches from two ends with constant strain (stress level) simultaneously.Usually carried out such test minimum 20 days (if before finishing in 20 days sample lost efficacy or cracking be time still less).This test is ASTM standard G47 (G47-98) test.
For the extruded alloy product that comprises light sheet products, adopt another preferred SCC-test of carrying out according to ASTM standard G47 (G38-73).This test comprises the opposite end of adopting constant strain level and alternating impregnating condition compression C-shape substantially similar to the above to encircle.Although AA7075, AA7050 or AA7150-T6 tempering alloy SCC test failure within less than the time of 20 days, and to degrade performance be EC or ED, and the solidity to corrosion characteristic increases with tempering T76-, T74-, T73.The characteristic of degrading of T73 is EA or better.This paper the following describes specific embodiment.
The amount of zinc (in % by weight) is approximately 8.1 o'clock, and the chemical constitution of alloy of the present invention has approximately 1.93 magnesium and the preferred amounts of copper.But, if manganese lower than 0.05, and preferably lower than 0.02, the amount of zinc (in % by weight) is 6.1-8.3, more preferably 6.1-7.0.Preferred implementations more of the present invention have been described in this paper the following examples.
The amount of zinc was higher than 7.6 o'clock, and the amount of manganese (in % by weight) is preferably approximately 0.06-0.12.In the operating period that may cause the alloy microstructure recrystallize, manganese helps or helps to control grain-size.This preferred manganese level is lower than the AA7000-series alloy of routine, but zinc level is when raising, and the manganese level can raise.
The amount of other alloying element Ce and/or Sc is lower than 0.20, preferred 0.05-0.15, preferred approximately 0.10.
Have the preferred production process of the malleable high strength Al-Zn alloy product of improvement solidity to corrosion and toughness combination, the method comprises the steps:
A) casting has the ingot casting of following composition (by weight percentage):
Zn is 6.0-9.5 approximately
Cu is 1.3-2.4 approximately
Mg is 1.5-2.6 approximately
Mn<0.12
Zr<0.20, preferred 0.05-0.15
Cr<0.10
Fe<0.25
Si<0.25
Ti<0.10
Hf and/or V<0.25, Ce and/or Sc<0.20 alternatively,
Other each element is all lower than 0.05, and total amount is lower than 0.25, and surplus is aluminium, and wherein (by weight percentage):
0.1[Cu]+1.3<[Mg]<0.2[Cu]+2.15,
B) after the casting to ingot homogenization and/or preheat,
C) ingot casting is carried out hot-work and is cold worked into alternatively converted products,
D) solution heat treatment under being enough to make the temperature and time condition during all soluble components enter sosoloid basically of this alloy, and
E) by a kind of method in spray quenching or the quenching of the submergence in water or other quenchant, the solution heat treatment product is quenched.
Also can further realize characteristic of the present invention by preferred method, preferred method comprises carries out the artificial aging processing to processing and solution heat treatment product, wherein the timeliness step is included in temperature 105-135 ℃, the preferred approximately thermal treatment for the first time under 120 ℃ 2-20 hour, preferred approximately 8 hours, and higher than 135 ℃, but lower than 210 ℃, at the temperature of preferred 155 ℃ thermal treatment 4-12 hour for the second time, preferred approximately 8-10 hour.
By such two step ageing treatment, obtain and corrosive property like T76-tempering alloy corrosion property class.But, can also carry out artificial aging to processing and heat treated article, wherein this timeliness step is included at 105-135 ℃ of temperature thermal treatment for the third time more than 20 hours, below 30 hours.This T77-temper aging operation is known, and compares with two-step timeliness operation and can also improve its performance characteristic.But two-step timeliness operation can obtain thin alloy product, and these product sections and T77-tempered product quite and partly are better than T77-tempering goods.
In addition, also may adopt two-step timeliness operation will process with the heat treated article artificial aging and be processed into T79-or T76-tempering.After casting, after ingot casting is carried out homogenizing and/or preheats, preferably ingot casting is carried out hot-work, and optional this hot-work product is cold worked into the 15-45mm converted products, thereby obtain thin plate.
The alloy that employing has the alloy of above-mentioned composition or production according to the method described above can obtain this high strength Al-Zn sheet alloy product.Such plate product preferably can be used as thin aircraft component, more preferably as the structural shape member that extends.Even more preferably as the top wing member, be preferably used as the plate product of the thin skin member of aircraft top wing or stringer.
By the detailed description of following preferred embodiment, will become apparent according to aforementioned and further feature and the advantage of alloy of the present invention.
Embodiment 1
For comparing, the performance to alloy of the present invention and AA7150-T77 alloy tests.Find, the embodiment of alloy of the present invention demonstrates the improvement with respect to conventional AA7150-T77-tempering alloy.
According to technical scale, four kinds of different aluminum alloy casts are caused ingot, homogenizing, 410 ℃ of preheatings more than 6 hours and be rolled into the sheet material of 30 millimeters.After this, these sheet materials are carried out solution heat treatment at 475 ℃ and then carry out shrend.Then adopt two after this ,-step T79-T76 timeliness operation is carried out ageing treatment to the product that quenches.Chemical constitution is as shown in table 1.
Table 1
The chemical constitution of sheet alloy (take % by weight), surplus are aluminium and inevitable impurity, the Mn of alloy 1-4≤0.02:
After this according to following test conditions, this aging alloy is tested:
Measure tensile yield strength according to EN10.002, measure the anti-characteristic (" EXCO ") of degrading according to ASTM G-34-97, measure stress corrosion crack (" SCC ") according to ASTM G-47-98, all are measured Kahn-Tear (toughness) and measure compression yield strength (" CYS ") according to ASTM E-9 according to ASTM E-399 all along the ST-direction.
Listed the result of the T79-T76 timeliness plate product of four kinds of alloys as shown in table 1, wherein with the AA7150-T77 tempering alloy ratio of routine than the time in table 2a, and with the AA7150-T76/T74/T6 tempering alloy ratio of routine than the time in table 2b:
Table 2a
The intensity of table 1 alloy (30 millimeters sheet material) and the comparison overview of toughness and three kinds of reference alloys (AA7150-T77), with alloy 1-4 timeliness to T79-T76:
Do not lose efficacy after NF=40 days.
Table 2b
The corrosive property of table 1 alloy (30 millimeters sheet material) and the comparison overview of three kinds of reference alloys (AA7150-T76, AA7150-T74, AA7150-T6); With alloy 1-4 timeliness to T79-T76:
? |
The SCC threshold value |
Alloy 1 |
NF when 172MPa |
Alloy 2 |
NF when 240MPa |
Alloy 3 |
NF when 240MPa |
Alloy 4 |
NF when 240MPa |
AA7150-T76 |
117-172MPa |
AA7150-T74 |
240MPa |
AA7150-T6 |
<48MPa |
Do not lose efficacy after NF=40 days.
2a, b can find out by table, and alloy 1,2 and 4 demonstrates better intensity/toughness combination.Alloy 2,3 and 4 all has acceptable EXCO performance, and its interalloy 2,3 and 4 has than the much higher compression yield strength of alloy 1 (AA7050-alloy).Alloy 2 and 4 has makes them be very suitable for the balancing performance that the top wing in aerospace is used, thereby shows the balancing performance that is better than conventional 7150T77 alloy.But, can also use the T77 tempering to alloy of the present invention, as shown in table 3.
Table 3
Carry out the alloy 2 and 4 of tempering according to the T77 tempered condition, intensity, toughness and corrosive property overview.
Alloy 4 likely has been carried out other SCC test, wherein prepare alloy 4-sample (measuring the standard test methods of the stress corrosion cracking cracking susceptibility of AA7000-series aluminium alloy products) according to the operation of describing in ASTM G-47-98, and be exposed to aggressive atmosphere (according to estimate the alternately immerse of the standard implementation method of metal and Alloy Anti stress corrosion crack by alternately immerse in 3.5%NaCl solution) according to ASTM G-44-94.
As shown in table 4, alloy 4 samples are selected four different stress levels.To each stress level, make three samples be exposed to testing circumstance (ASTM G-44).Take out a sample after 1 week, and make two other sample expose 40 days.When period of contact does not occur ftractureing, measure its tensile property, as shown in table 4.
Table 4
Alloy 4 is exposed to four tensile strength performance overviews after different stress levels, applies prestress along the LT direction.
As can be seen from Table 4, do not measure the reduction of residual strength along with the increase of load, for the tensile strength performance of paying close attention to, this means measurable stress corrosion not occur after 40 days.
Embodiment 2
When the higher strength level of needs and toughness properties when not too important, the alloy that preferred conventional AA7055-T77 alloy is used as top wing, rather than AA7150-T77 alloy.Therefore, the invention discloses copper and the magnesium compositing range of optimization, it demonstrates with conventional AA7055-T77 alloy phase works as or better properties.
11 kinds of different aluminum alloy casts are caused ingot, and they have the listed following chemical constitution of table 5.
Table 5
The chemical constitution of 11 kinds of alloys (take % by weight), surplus are aluminium and inevitable impurity, Zr=0.08, Si=0.05, Fe=0.08.
Alloy |
Cu |
Mg |
Zn |
Mn |
1 |
2.40 |
2.20 |
8.2 |
0.00 |
2 |
1.94 |
2.33 |
8.2 |
0.00 |
3 |
1.26 |
2.32 |
8.1 |
0.00 |
4 |
2.36 |
1.94 |
8.1 |
0.00 |
5 |
1.94 |
1.92 |
8.1 |
0.00 |
6 |
1.30 |
2.09 |
8.2 |
0.00 |
7 |
1.92 |
1.54 |
8.1 |
0.00 |
8 |
1.27 |
1.57 |
8.1 |
0.00 |
9 |
2.34 |
2.25 |
8.1 |
0.07 |
10 |
2.38 |
2.09 |
8.1 |
0.00 |
11 |
2.35 |
1.53 |
8.2 |
0.00 |
Preheat this casting alloy 6 hours under 410 ℃, then this alloy is rolled into and measures its intensity and property of toughness after 28 mm sizes.After this, carry out solution heat treatment and shrend at 475 ℃.120 ℃ of ageing treatment 8 hours and 155 ℃ of ageing treatment 8-10 hours (T79-T76-tempering).Result is as shown in table 6.
Table 6
Intensity and the toughness overview of 11 kinds of alloys of table 5 on the direction of indicating.
When alloy 3-8 and 11 demonstrated good property of toughness, alloy 1-5 and 9 and 10 demonstrated good strength characteristics.Therefore, alloy 3,4 and 5 demonstrates the well balanced of intensity and toughness, therefore, is clear that very zinc content (take % by weight) is at 8.1 o'clock, and copper content is higher than 1.3, and Mg content is higher than 1.6.This tittle is the lower limit of copper and magnesium scope.As can be seen from Table 6, when the level of copper and magnesium is too high (alloy 1,2,9 and 10), toughness will drop to unacceptable low-level.
Embodiment 3
Studied the impact of manganese on alloy property of the present invention.Discovery has in the alloy of high zinc content, and best manganese level is 0.05-0.12.As shown in table 7 and table 8.The chemical property that all are not mentioned and machined parameters be similar with embodiment 2 all.
Table 7
The chemical constitution (in % by weight) of three kinds of alloys (Mn-0, Mn-1 and Mn-2), surplus are aluminium and inevitable impurity, Zr=0.08, Si=0.05, Fe=0.08.
Alloy |
Cu |
Mg |
Zn |
Mn |
Mn-0 |
1.94 |
2.33 |
8.2 |
0.00 |
Mn-1 |
1.94 |
2.27 |
8.1 |
0.06 |
Mn-2 |
1.96 |
2.29 |
8.2 |
0.12 |
Table 8
3 kinds of alloys of table 7 are in intensity and the toughness overview of indicating direction.
As shown in table 8, when strength characteristics increases, property of toughness reduces.For the alloy of Gao Xinliang, the manganese level of optimization is 0.05-0.12.
Embodiment 4
When the higher strength level of needs and toughness properties when not too important, the alloy that preferred conventional AA7055-T77 alloy is used as top wing, rather than AA7150-T77 alloy.Therefore, the invention discloses copper and the magnesium compositing range of optimization, it demonstrates with conventional AA7055-T77 alloy phase works as or better properties.
Two kinds of different aluminum alloy casts are caused ingot, and they have following chemical constitution as listed in table 9.
Table 9
The chemical constitution of three kinds of alloys (in % by weight), surplus are aluminium and inevitable impurity, Zr=0.08, Si=0.05, Fe=0.08; (Ref=AA7055 alloy).
Alloy |
Si |
Fe |
Cu |
Mn |
Mg |
Cr |
Zn |
Ti |
Zr |
1 |
0.05 |
0.09 |
2.24 |
0.01 |
2.37 |
0.01 |
7.89 |
0.04 |
0.10 |
2 |
0.04 |
0.07 |
1.82 |
0.08 |
2.18 |
0.00 |
8.04 |
0.03 |
0.10 |
Ref. |
? |
? |
2.1-2.6 |
? |
1.8-2.2 |
? |
7.6-8.4 |
? |
? |
Tested the strength characteristics of alloy 1 and 2.These characteristics are as shown in table 10.Alloy 2 carries out temper (T79-T76 and T77) according to two kinds of tempered condition.Measure reference alloy A A7055 (M-Ref) under the T77 tempering, given simultaneously the technical data (showing bright with Ref) of the AA7055 reference alloy under the T77 tempering.
Table 10
Alloy 2 under two kinds of alloys of the present invention of table 9, two kinds of tempered condition, the reference alloy (AA7055) measured are (M-Ref) and the intensity overview of technique thin plate (Ref).
Alloy |
Tempering |
Rp-L |
Rp-LT |
Rp-ST |
Rm-L |
Rm-LT |
Rm-ST |
1 |
T79-T76 |
604 |
593 |
559 |
634 |
631 |
613 |
2 |
T79-T76 |
612 |
598 |
571 |
645 |
634 |
618 |
2 |
T77 |
619 |
606 |
569 |
640 |
631 |
610 |
Ref |
T77 |
614 |
614 |
- |
634 |
641 |
- |
M-Ref |
T77 |
621 |
611 |
537 |
638 |
634 |
599 |
Along the property of toughness of LT and TL direction and as shown in table 11 along compression yield strength characteristic and the corrosive property feature of L and LT direction.
Table 11
Toughness and the CYS performance of two kinds of alloys of the present invention on different tempered condition and different tests direction in table 9, NF=did not lose efficacy after 40 days at the stress level of appointment, otherwise pointed out the number of days that sample lost efficacy.
Alloy of the present invention has and tensile property like conventional AA7055-T77 alloy type.But, be better than conventional AA7055-T77 alloy in the performance of ST direction.In addition, stress corrosion characteristics is better than the AA055-T77 alloy.Therefore, alloy of the present invention can be used as and also can be used for the cheaper alternative of the AA7055-T77 tempering alloy of timeliness-creep forming, thereby shows excellent compression yield strength and solidity to corrosion.
Fully describe now the present invention, obviously for those skilled in the art, can make many changes and modification in the situation that do not deviate from purport and the scope of invention as herein described.The appended claims are to limit the present invention.