US2248185A - Heat treatment of aluminum base alloys - Google Patents
Heat treatment of aluminum base alloys Download PDFInfo
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- US2248185A US2248185A US283995A US28399539A US2248185A US 2248185 A US2248185 A US 2248185A US 283995 A US283995 A US 283995A US 28399539 A US28399539 A US 28399539A US 2248185 A US2248185 A US 2248185A
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- 229910045601 alloy Inorganic materials 0.000 title description 64
- 239000000956 alloy Substances 0.000 title description 64
- 238000010438 heat treatment Methods 0.000 title description 34
- 229910052782 aluminium Inorganic materials 0.000 title description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title description 20
- 239000000243 solution Substances 0.000 description 24
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 16
- 229910052802 copper Inorganic materials 0.000 description 16
- 239000010949 copper Substances 0.000 description 16
- 239000011701 zinc Substances 0.000 description 16
- 229910052725 zinc Inorganic materials 0.000 description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 15
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 15
- 230000007797 corrosion Effects 0.000 description 15
- 238000005260 corrosion Methods 0.000 description 15
- 229910052749 magnesium Inorganic materials 0.000 description 15
- 239000011777 magnesium Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 15
- 239000000470 constituent Substances 0.000 description 11
- 238000010791 quenching Methods 0.000 description 10
- 230000000171 quenching effect Effects 0.000 description 10
- 230000032683 aging Effects 0.000 description 9
- 230000035882 stress Effects 0.000 description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 8
- 238000003483 aging Methods 0.000 description 8
- 229910052748 manganese Inorganic materials 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 8
- 238000011282 treatment Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241000518994 Conta Species 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 magneslum Chemical compound 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- 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
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- 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
- C22F1/053—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 zinc as the next major constituent
Definitions
- This invention relates to aluminum base alloys containing zinc, magnesium, copper, and manganese, and is more particularly concerned with the treatment of such alloys to prevent corrosion thereof.
- aluminum base alloys I mean alloys containing more than 50 per cent aluminum.
- a large number of aluminum base alloys are susceptible to improvement in tensile strength, yield strength, hardness, and other physical properties by various thermal treatments.
- One of the most common of these treatments which is usually employed in combination with a subsequent precipitation or age-hardening treatment and is often referred to as a solution heat-treatment, consists in subjecting the alloy to a tem:- perature and for a time sufiicient tocause solution of a substantial quantity of the soluble elements of the alloy but below the fusion temperature of the alloys lowest melting point constituent. These elements then may be retained in solution by a relatively rapid cooling or quenching to room temperature.
- the strength, hardness and other properties of some aluminum alloys may be further improved if the alloys are permitted to stand or age for a few days, or are artificially aged at a temperature of about 200 F. to 350F. for a shorter period of time.
- the object of my invention is to improve theresistance to corrosion of articles of thermally treated aluminum base alloys containing zinc, magnesium, copper, and manganese, and espeto stress. More particularly, the object of the invention is to "provide such a method for-im-' proving the resistance to corrosion of articles of alloys of the class above described, following their solution heat-treatment, which avoids the distortion resulting from the drastic quenching or rapid cooling of such articles.
- the specific object of my invention is to provide a method for'improvingthe resistance to corrosion of such articles of aluminum basealloys containing-zinc, magnesium, copper, and manganese which have 1 been subjected to solution heat-treatment and have been cooled ata relatively slow rate and subsequently artificially aged. Other.
- objects ing, and artificial aging are the aluminum base alloys containing zinc, magnesium, copper, and manganese.
- Such alloys are heated to a temperature between about 850 F. and 1000 F. and maintained at that temperature for a period of from about 5 minutes to about 10 hours in order to place a substantial portion of the soluble constituent of the alloy in solution, and, following quenching to'normal temperature, they are aged usually for about 2 to 30 hours at a temperature between about 200 F. and about 350 F.
- These alloys develop high tensile and yield strengths and other desirable properties when treated as above described. However, unless they are very rapidly or drastically cooled, following age-hardening they sometimes develop a susceptibility to a type of intergranular corrosion when exposed to corrosive conditions. This attack is believed to be due to the precipitation within the metal of a portionofuthe soluble alloying constituent will appear in the following description of the invention.
- My invention is predicated upon the discovery that the resistance to corrosion of solution treated and relatively slowly quenched articles of aluminum base alloys containing zinc, magnesium, copper, and manganese may be increased if they are given a comparativelylow temperature heattreatment following the normal artificial agehardening thereof.
- This treatment preferably is carried out by heating the articles at the termination of their artificial age-hardening period for a duration of between about 15 minutes and about 2 hours at a temperature of about 350 F. to 450 F.
- the articles then may be cooled to room temperature in any convenient manner, as, for instance, bynatural cooling or by quenching, without distortion of their shape.
- This treatment may be practiced at very little expense and is adaptedto be carried out in the heat-treating equipment commonly used.
- the above described method has been found to be particularly adapted to aluminum base alloys containing between about 3 per cent and about 10 per cent zinc, between about 0.75 per cent and about 4 per cent magnesium, between about .05 per cent and about 3 per cent copper,
- the invention may be practiced with advantage to increase the resistance to stress corrosion of articles of other aluminum base alloys containing zinc, magneslum, copper, and manganese which have been cooled from the solution heat-treatment temperature at a relatively slow rate and subsequently age-hardened; and the invention may be utilized with particular advantage where itis desirable to avoid distortion of the shape 01' articles of suchalloys which are .to be subjected to solution heat-treatment and age-hardening.
- a method of heat-treating an aluminum base alloy containing zinc, magnesium, copper, and manganese which comprises heating the alloy at a temperature and for a time sufficient to place a substantial portion of its soluble constituent in solution, quenching the alloy, artificially aging the alloy, and subsequently heating the alloy between 350 F. and 450 F. for from about 15 2.
- a method of heat-treating an aluminum base alloy containing zinc, magnesium, copper, and manganese which comprises heating the alloy between 850 F. and 1000 F. for from minutes to hours, quenching the alloy at a relatively slow rate, aging the alloy between 225 F. and 350 F.
- a met 0d of heat-treating an aluminum base alloy conta 'ng from about 3 per cent to about 10 per cent zinc, from about 0.75 per cent to about 4 per cent magnesium, from about 0.5 per cent to about 3 per cent copper, and .from about 0.1 per cent to about 1.5 per cent manganese,
- which method comprises heating said alloy at a temperature and for a time suflicient to place a substantial portion of the soluble constituent thereof in solution, quenching the alloy at a relatively slow rate, artificially aging the alloy, and subsequently heating the alloy at a temperature of between 350 F. and 450 F. for a period of from about 15 minutes to about 2 hours.
- a method of heat-treating an article of aluminum base alloy, said alloy containing zinc, magnesium, copper, and manganese which comprises heating the article at a temperature and for a time sufficient to place a substantial portion of the soluble constituent of said alloy in solution, quenching the article at a rate sumciently 510w to avoid distortion of the shape of the article and sufliciently rapid to retain a substantial portion of the constituent of said alloy in solid solution, artificially aging the article, and subsequently heating the article between 350 F.
- a method of heat-treating an aluminum base alloy containing zinc, magnesium, copper, and manganese which comprises heating the alloy at a temperature and for a time sufiicient to place a substantial portion of its soluble constituent in solution, air quenching the alloy, artificially aging the alloy, and subsequently heating the alloy between 350 F. and 450 F. for a period of from about 15 minutes to about 2 hours.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Resistance Heating (AREA)
- Conductive Materials (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Prevention Of Electric Corrosion (AREA)
Description
Patented July 8, 1941 HEAT TREATMENT OF ALUMINUM ALLOYS BASE Joseph A. Nock, Jr., Tarentum, Pa., assignor to Aluminum Companyot America, Pittsburgh, Pa., a corporation of Pennsylvania No Drawing.
Application July 12, 1939,
Serial No. 283,995
(Cl. 148-Z1.1)
8 Claims.
This invention relates to aluminum base alloys containing zinc, magnesium, copper, and manganese, and is more particularly concerned with the treatment of such alloys to prevent corrosion thereof. By the term aluminum base alloys, I mean alloys containing more than 50 per cent aluminum.
A large number of aluminum base alloys are susceptible to improvement in tensile strength, yield strength, hardness, and other physical properties by various thermal treatments. One of the most common of these treatments, which is usually employed in combination with a subsequent precipitation or age-hardening treatment and is often referred to as a solution heat-treatment, consists in subjecting the alloy to a tem:- perature and for a time sufiicient tocause solution of a substantial quantity of the soluble elements of the alloy but below the fusion temperature of the alloys lowest melting point constituent. These elements then may be retained in solution by a relatively rapid cooling or quenching to room temperature. Following this solution heat-treatment and quenching, the strength, hardness and other properties of some aluminum alloys may be further improved if the alloys are permitted to stand or age for a few days, or are artificially aged at a temperature of about 200 F. to 350F. for a shorter period of time.
Among the alloys which are susceptible to improvement by solution heat-treatment, quenchcially of such articles which are subjected in use i jected to stress, either internal or external in;
source, which tends to fracture the alloy, thereby exposing fresh surfaces to corrosive agents..
Such corrosion in alloys of this type can be substantially prevented if the alloy article is very rapidly or drastically quenched in cold water following solution heat-treatment, but this pro cedure is often impractical because it is apt to produce distortion or warpage of the article.
The object of my invention is to improve theresistance to corrosion of articles of thermally treated aluminum base alloys containing zinc, magnesium, copper, and manganese, and espeto stress. More particularly, the object of the invention is to "provide such a method for-im-' proving the resistance to corrosion of articles of alloys of the class above described, following their solution heat-treatment, which avoids the distortion resulting from the drastic quenching or rapid cooling of such articles. The specific object of my invention is to provide a method for'improvingthe resistance to corrosion of such articles of aluminum basealloys containing-zinc, magnesium, copper, and manganese which have 1 been subjected to solution heat-treatment and have been cooled ata relatively slow rate and subsequently artificially aged. Other. objects ing, and artificial aging are the aluminum base alloys containing zinc, magnesium, copper, and manganese. Such alloys are heated to a temperature between about 850 F. and 1000 F. and maintained at that temperature for a period of from about 5 minutes to about 10 hours in order to place a substantial portion of the soluble constituent of the alloy in solution, and, following quenching to'normal temperature, they are aged usually for about 2 to 30 hours at a temperature between about 200 F. and about 350 F. These alloys develop high tensile and yield strengths and other desirable properties when treated as above described. However, unless they are very rapidly or drastically cooled, following age-hardening they sometimes develop a susceptibility to a type of intergranular corrosion when exposed to corrosive conditions. This attack is believed to be due to the precipitation within the metal of a portionofuthe soluble alloying constituent will appear in the following description of the invention.
My invention is predicated upon the discovery that the resistance to corrosion of solution treated and relatively slowly quenched articles of aluminum base alloys containing zinc, magnesium, copper, and manganese may be increased if they are given a comparativelylow temperature heattreatment following the normal artificial agehardening thereof. This treatment preferably is carried out by heating the articles at the termination of their artificial age-hardening period for a duration of between about 15 minutes and about 2 hours at a temperature of about 350 F. to 450 F. The articles then may be cooled to room temperature in any convenient manner, as, for instance, bynatural cooling or by quenching, without distortion of their shape. This treatment may be practiced at very little expense and is adaptedto be carried out in the heat-treating equipment commonly used.
The above described method has been found to be particularly adapted to aluminum base alloys containing between about 3 per cent and about 10 per cent zinc, between about 0.75 per cent and about 4 per cent magnesium, between about .05 per cent and about 3 per cent copper,
and between about 0.1 per cent and about 1.5 per cent manganese. Various amounts of other elements also may be present to modify or improve certain properties of the alloys, as for example,
alternating immersion oi the specimens into the solution andexposure to the atmosphere was continued ior a period of 48 hours, after which the specimens were tested for the usual physical titanium-y vanadium, zirconium, chromium, co- 5 pmperties,ashereinafter disclosed. belt, tungsten, columbium, or tantalum. The tests showed that the specimens which In a specific application of my invention,1 have had been relatively slowly coole from the sotested specimens of an alloy containing 5.46 per lution heat-treating temperature had suflered cent zinc, 2.21 per cent magnesium, 1.51 per cent much greater losses in properties due to corrosion copper, 0.42 per cent manganese, 0.28 per cent than had those which had been very rapidly iron, 0.17 per cent silicon, and 0.09 per cent tiquenched; and of the slowly cooled specimens, tanium, the remainder of the alloy'being alumithose which had been subjected to=stress during num. These specimens were given a solution exposure to corrosive conditions showed a much heat-treatment often employed for this alloy at greater loss in properties than did the unstressed a temperature of 900 F. for a period of between specimens. These observations indicate that rela- 15 and minutes. Some of the specimens were tively slowly cooled objects of the particular althen very rapidly quenched in cold water andloy have a much lower resistance to corrosion, the others were more slowly cooled by a. high veparticularly it they are subjected to stress while locity air blast. Although all of the specimens exposed to corrosive conditions, than the drastiwere cooled rapidly enough to effect a supersatu- 20 cally quenched objects. rated solution of the alloying constituent in the- Some of the age-hardened specimens which metal at room temperature, the specimens which had been relatively slowly quenched and aged for had been drastically quenched were distorted and 8 hours at 275 F. were then heated for /2 hour twisted by their very rapid cooling, while" the at temperatures of 375, 400, and 425 F. These specimens which had been cooled at a relatively were exposed to the corrosive conditions described slow rate retained their shape. All specimens above, some of the specimens being subjected to were then given an artificial aging treatment for stress during exposure and the others being un- 8 hours at a temperature of 275 F., following stressed. Following 48 hours of alternating exwhich it was found that there was no material posin'e to the salt solution and to the atmosdiiference between the strength and elongation phere, the specimens were tested. The tests of the specimens which had been very rapidly showed that the percentage loss of properties cooled and of those which had been more slowly was not appreciably greater in the slowly cooled from the solution temperature. quenched specimens which had been given a sec- These specimens were then exposed to corrosive ondary relatively low temperature heat-treatment conditions. More specifically, they were repeatthan it had been in the drastically quenched edly subjected to short periods of immersion in specimens, indicating that the resistance to corn n rma 1 11111 m'i q s 801 1 21 11 rosion oi the slowly cooled specimens, even uncontaining 0.3 per cent hydrogen peroxide and der stress, was substantially equivalent to that to short intervening periods of exposure to the of the drastically cooled specimens as a result of atm sp r rin his procedure some of the 40 the above described thermal treatment subsespecimens were subjected to stress equivalent to quent to age-hardening. 75 per-cent oi the yield strength of the alloy The test results are tabulated herewith. The in order that their resistance to stress corrosion numbers preceding the test results are identified might be determined. This repeated cycle of at the end of the'table.
Properties of heat-treated, Percentage loss in properties following quenched, and aged articles exposure to corrosion Unstressed Stressed as; 3%
a mug on s frz h g th Elong' 52 123 1 1251 I Elong Lbalsq. in. Lita/again. Percent Percent Percent Percent Percent 74, 810 64,750 12.8 -4. 43 5 -49 15,900 I 000. 14.0 -10 os -24 -s1 Properties oiheat-treated, quenched,
enthusias Wm I Instressed Stressed E it are. ar a 5 n3 Tensile Tensile strength Elong strength Elong Lba/og. in Lbs/sq. in. Percent Percent Percent Percent Percent 1 Very rapid] quenched from solution heat-treatment temperature.
Relatively owl quenched irom heat-treatment temperature.
Relatively slow y quenched from heat-treatment temperature and treated at 375 F. iollowhg age-hardenin Relatively iollo Relatively 425 F. allowing age-hardening;
g. i owly quenched from heat-treatment temperature and treated at age-hardening. I
owly quenched from heat-treatment temperature and treated at minutes to about 2 hours.
nection with the treatment of a specific alloy, it
may be practiced with advantage to increase the resistance to stress corrosion of articles of other aluminum base alloys containing zinc, magneslum, copper, and manganese which have been cooled from the solution heat-treatment temperature at a relatively slow rate and subsequently age-hardened; and the invention may be utilized with particular advantage where itis desirable to avoid distortion of the shape 01' articles of suchalloys which are .to be subjected to solution heat-treatment and age-hardening.
I claim:
1. A method of heat-treating an aluminum base alloy containing zinc, magnesium, copper, and manganese which comprises heating the alloy at a temperature and for a time sufficient to place a substantial portion of its soluble constituent in solution, quenching the alloy, artificially aging the alloy, and subsequently heating the alloy between 350 F. and 450 F. for from about 15 2. A method of heat-treating an aluminum base alloy containing zinc, magnesium, copper, and manganese which comprises heating the alloy between 850 F. and 1000 F. for from minutes to hours, quenching the alloy at a relatively slow rate, aging the alloy between 225 F. and 350 F.
for a period of between 2 and 30 hours, and subsequently heating the alloy at a temperature of between 350 F. and 450 F. for a period of from about minutes to about 2 hours.
3. A met 0d of heat-treating an aluminum base alloy conta 'ng from about 3 per cent to about 10 per cent zinc, from about 0.75 per cent to about 4 per cent magnesium, from about 0.5 per cent to about 3 per cent copper, and .from about 0.1 per cent to about 1.5 per cent manganese,
which method comprises heating said alloy at a temperature and for a time suflicient to place a substantial portion of the soluble constituent thereof in solution, quenching the alloy at a relatively slow rate, artificially aging the alloy, and subsequently heating the alloy at a temperature of between 350 F. and 450 F. for a period of from about 15 minutes to about 2 hours.
4. A method of heat-treating an article of aluminum base alloy, said alloy containing zinc, magnesium, copper, and manganese, which comprises heating the article at a temperature and for a time sufficient to place a substantial portion of the soluble constituent of said alloy in solution, quenching the article at a rate sumciently 510w to avoid distortion of the shape of the article and sufliciently rapid to retain a substantial portion of the constituent of said alloy in solid solution, artificially aging the article, and subsequently heating the article between 350 F.
and 450 F. for from about 15 minutes to about 2 hours.
5. A method of heat-treating an aluminum base alloy containing zinc, magnesium, copper, and manganese, which comprises heating the alloy at a temperature and for a time sufiicient to place a substantial portion of its soluble constituent in solution, air quenching the alloy, artificially aging the alloy, and subsequently heating the alloy between 350 F. and 450 F. for a period of from about 15 minutes to about 2 hours. I
6. The method of increasing corrosion resistance of an aluminum base alloy containing zinc; magnesium, copper, and manganese, which has been relatively slowly cooled from the solution heat-treatment temperature and artificially agehardened, which method comprises heating said alloy to a temperature ofbetween about 350 F. and about 450 F. and maintaining the alloy at said temperature for a period of about 15 minutes to about 2 hours.
7. In the treatment of an aluminum base alloy containing zinc, magnesium, copper, and manganese to increase its strength and hardness by heating said alloy at a temperature and for a time suificient to place a substantial portion of the soluble constituent thereof in solution, cooling the alloy at a relatively slow rate, and artificially aging the alloy, the subsequent step of heatingsaid alloy for a period of from about 15 minutes to about 2 hours at a temperature of between about 350 F. and 425 F. to improve the resistance of said alloy to corrosion.
8. The method of increasing the strength and hardness of an article of aluminum base alloy containing zinc, magnesium, copper, and manganese, said method. being characterized by a resulting increase in the resistance of the article to corrosion and the absence of substantial distortion to the shape of the article, which method comprises heating said article at a temperature and for a time sufiicient to place a substantial part of the soluble constituent of said alloy in solution, cooling the article at arelatively slow rate, artificially aging the article, and then heating the article at a temperature of between about 350 F. and 450 F. for a period of from about 15 minutes to about 2 hours.
JOSEPH A. NOCK, JR.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US283995A US2248185A (en) | 1939-07-12 | 1939-07-12 | Heat treatment of aluminum base alloys |
GB8005/40A GB544439A (en) | 1939-07-12 | 1940-05-03 | Improvements in or relating to the heat-treatment of aluminium base alloys |
FR868271D FR868271A (en) | 1939-07-12 | 1940-05-23 | Improvements in the heat treatment of aluminum-based alloys |
CH226273D CH226273A (en) | 1939-07-12 | 1940-05-23 | Process for the heat treatment of objects made of an aluminum alloy. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US283995A US2248185A (en) | 1939-07-12 | 1939-07-12 | Heat treatment of aluminum base alloys |
Publications (1)
Publication Number | Publication Date |
---|---|
US2248185A true US2248185A (en) | 1941-07-08 |
Family
ID=23088447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US283995A Expired - Lifetime US2248185A (en) | 1939-07-12 | 1939-07-12 | Heat treatment of aluminum base alloys |
Country Status (4)
Country | Link |
---|---|
US (1) | US2248185A (en) |
CH (1) | CH226273A (en) |
FR (1) | FR868271A (en) |
GB (1) | GB544439A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2887422A (en) * | 1950-02-25 | 1959-05-19 | United Eng Foundry Co | Method of continuously heat treating aluminum strip |
US3290187A (en) * | 1964-06-01 | 1966-12-06 | Kaiser Aluminium Chem Corp | Metallurgy |
US3856584A (en) * | 1972-04-12 | 1974-12-24 | Israel Aircraft Ind Ltd | Reducing the susceptibility of alloys, particularly aluminium alloys, to stress corrosion cracking |
US4832758A (en) * | 1973-10-26 | 1989-05-23 | Aluminum Company Of America | Producing combined high strength and high corrosion resistance in Al-Zn-MG-CU alloys |
US4861391A (en) * | 1987-12-14 | 1989-08-29 | Aluminum Company Of America | Aluminum alloy two-step aging method and article |
US4863528A (en) * | 1973-10-26 | 1989-09-05 | Aluminum Company Of America | Aluminum alloy product having improved combinations of strength and corrosion resistance properties and method for producing the same |
EP0392844A1 (en) * | 1989-04-14 | 1990-10-17 | Nkk Corporation | Treatment of aluminium alloy |
US5221377A (en) * | 1987-09-21 | 1993-06-22 | Aluminum Company Of America | Aluminum alloy product having improved combinations of properties |
US5496426A (en) * | 1994-07-20 | 1996-03-05 | Aluminum Company Of America | Aluminum alloy product having good combinations of mechanical and corrosion resistance properties and formability and process for producing such product |
US6869490B2 (en) | 2000-10-20 | 2005-03-22 | Pechiney Rolled Products, L.L.C. | High strength aluminum alloy |
CN102952981A (en) * | 2012-11-19 | 2013-03-06 | 宁波福士汽车部件有限公司 | Alloy material of water pipe for vehicle and preparation method of alloy material |
CN102965552A (en) * | 2012-11-19 | 2013-03-13 | 宁波福士汽车部件有限公司 | Alloy material for automotive water tube |
CN107365928A (en) * | 2017-09-06 | 2017-11-21 | 湖南鑫海环保科技有限公司 | A kind of magnalium kirsite and preparation method |
CN109252076A (en) * | 2018-11-13 | 2019-01-22 | 中南大学 | A kind of anticorrosion stress-resistant Al-Zn-Mg- (Cu) alloy and preparation method thereof containing Ta |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1175001B (en) * | 1958-08-16 | 1964-07-30 | Ver Leichtmetallwerke Gmbh | Process for the production of light metal objects with high spring force |
US3171760A (en) * | 1963-04-29 | 1965-03-02 | Aluminum Co Of America | Thermal treatment of aluminum base alloy products |
US3231435A (en) * | 1964-11-25 | 1966-01-25 | Harvey Aluminum Inc | Method of eliminating stress corrosion cracking in copper-magnesium-zinc series aluminum alloys |
IL156386A0 (en) * | 2000-12-21 | 2004-01-04 | Alcoa Inc | Aluminum alloy products and artificial aging method |
-
1939
- 1939-07-12 US US283995A patent/US2248185A/en not_active Expired - Lifetime
-
1940
- 1940-05-03 GB GB8005/40A patent/GB544439A/en not_active Expired
- 1940-05-23 CH CH226273D patent/CH226273A/en unknown
- 1940-05-23 FR FR868271D patent/FR868271A/en not_active Expired
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2887422A (en) * | 1950-02-25 | 1959-05-19 | United Eng Foundry Co | Method of continuously heat treating aluminum strip |
US3290187A (en) * | 1964-06-01 | 1966-12-06 | Kaiser Aluminium Chem Corp | Metallurgy |
US3856584A (en) * | 1972-04-12 | 1974-12-24 | Israel Aircraft Ind Ltd | Reducing the susceptibility of alloys, particularly aluminium alloys, to stress corrosion cracking |
US4832758A (en) * | 1973-10-26 | 1989-05-23 | Aluminum Company Of America | Producing combined high strength and high corrosion resistance in Al-Zn-MG-CU alloys |
US4863528A (en) * | 1973-10-26 | 1989-09-05 | Aluminum Company Of America | Aluminum alloy product having improved combinations of strength and corrosion resistance properties and method for producing the same |
US5221377A (en) * | 1987-09-21 | 1993-06-22 | Aluminum Company Of America | Aluminum alloy product having improved combinations of properties |
US4861391A (en) * | 1987-12-14 | 1989-08-29 | Aluminum Company Of America | Aluminum alloy two-step aging method and article |
US5035754A (en) * | 1989-04-14 | 1991-07-30 | Nkk Corporation | Heat treating method for high strength aluminum alloy |
EP0392844A1 (en) * | 1989-04-14 | 1990-10-17 | Nkk Corporation | Treatment of aluminium alloy |
US5496426A (en) * | 1994-07-20 | 1996-03-05 | Aluminum Company Of America | Aluminum alloy product having good combinations of mechanical and corrosion resistance properties and formability and process for producing such product |
US6869490B2 (en) | 2000-10-20 | 2005-03-22 | Pechiney Rolled Products, L.L.C. | High strength aluminum alloy |
US20050189048A1 (en) * | 2000-10-20 | 2005-09-01 | Alex Cho | High strength aluminum alloy |
US7125459B2 (en) | 2000-10-20 | 2006-10-24 | Pechiney Rolled Products Llc | High strength aluminum alloy |
CN102952981A (en) * | 2012-11-19 | 2013-03-06 | 宁波福士汽车部件有限公司 | Alloy material of water pipe for vehicle and preparation method of alloy material |
CN102965552A (en) * | 2012-11-19 | 2013-03-13 | 宁波福士汽车部件有限公司 | Alloy material for automotive water tube |
CN107365928A (en) * | 2017-09-06 | 2017-11-21 | 湖南鑫海环保科技有限公司 | A kind of magnalium kirsite and preparation method |
CN109252076A (en) * | 2018-11-13 | 2019-01-22 | 中南大学 | A kind of anticorrosion stress-resistant Al-Zn-Mg- (Cu) alloy and preparation method thereof containing Ta |
CN109252076B (en) * | 2018-11-13 | 2020-10-27 | 中南大学 | Ta-containing stress corrosion resistant Al-Zn-Mg- (Cu) alloy and preparation method thereof |
Also Published As
Publication number | Publication date |
---|---|
GB544439A (en) | 1942-04-14 |
CH226273A (en) | 1943-03-31 |
FR868271A (en) | 1941-12-26 |
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