US2007102071A1PendingUtilityA1
High strength, high toughness, weldable, ballistic quality, castable aluminum alloy, heat treatment for same and articles produced from same
Est. expiryNov 9, 2025(expired)· nominal 20-yr term from priority
Inventors:Alan Druschitz
C22C 21/16C22C 21/12C22F 1/057
42
PatentIndex Score
0
Cited by
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References
0
Claims
Abstract
An aluminum alloy cast product is composed of: Cu 5.00-6.75 weight %, Mg 0.05-0.50 weight %, Mn 0.05-0.65 weight %, Ti 0.05-0.40 weight %, Ag 0.00-0.40 weight %, Cr 0.00-0.20 weight %, V 0.00-0.40 weight %, Zr 0.00-0.30 weight %, Fe <0.15 weight %, Si <0.15 weight %, Ni <0.05 weight %, Zn <0.05 weight %, impurities <0.05 each weight %, <0.25 total weight %, Al balance Such an aluminum alloy cast product is heat treated to eliminate the interdendritic network of second phase particles. The heat treatment of such an aluminum alloy casting alloy includes solution heat treatment before hot isostatic pressing.
Claims
exact text as granted — not AI-modified1 . An aluminum alloy cast product consisting essentially of:
Cu
5.00-6.75 weight %,
Mg
0.05-0.50 weight %,
Mn
0.05-0.65 weight %,
Ti
0.05-0.40 weight %,
Ag
0.00-0.40 weight %,
Cr
0.00-0.20 weight %,
V
0.00-0.40 weight %,
Zr
0.00-0.30 weight %,
Fe
<0.15 weight %,
Si
<0.15 weight %,
Ni
<0.05 weight %,
Zn
<0.05 weight %,
impurities
<0.05 each weight %,
<0.25 total weight %,
Al
balance
wherein an aluminum alloy cast product contains an interdendritic network of second phase particles in the as-cast condition.
2 . The cast product of claim 1 wherein the interdendritic network of second phase particles is eliminated by solution heat treatment prior to hot isostatic pressing.
3 . The cast product of claim 1 wherein the cast product after heat treatment exhibits relatively high strength, high toughness, high resistance to penetration from ballistic objects, high resistance to stress corrosion cracking and low weight.
4 . The cast product of claim 1 wherein the cast product is weldable.
5 . A method for producing a cast product of an aluminum alloy, comprising the steps of:
melting the following to form a cast alloy of: Cu 5.00-6.75 weight %, Mg 0.05-0.50 weight %, Mn 0.05-0.65 weight %, Ti 0.05-0.40 weight %, Ag 0.00-0.40 weight %, Cr 0.00-0.20 weight %, V 0.00-0.40 weight %, Zr 0.00-0.30 weight %, Fe <0.15 weight %, Si <0.15 weight %, Ni <0.05 weight %, Zn <0.05 weight %, impurities <0.05 each weight %, <0.25 total weight %, and Al balance; casting a product from the melted cast alloy; heat treating the cast product to eliminate an interdendritic network of second phase particles; hot isostatically pressing the heat treated cast product to eliminate porosity; and heat treating the hot isostatically pressed cast product to obtain desired mechanical and physical properties.
6 . A product made by the process of claim 5 .
7 . A cast product of an aluminum alloy consisting essentially of, in weight percent:
Cu
5.00-6.75 weight %,
Mg
0.05-0.50 weight %,
Mn
0.05-0.65 weight %,
Ti
0.05-0.40 weight %,
Ag
0.00-0.40 weight %,
Cr
0.00-0.20 weight %,
V
0.00-0.40 weight %,
Zr
0.00-0.30 weight %,
Fe
<0.15 weight %,
Si
<0.15 weight %,
Ni
<0.05 weight %,
Zn
<0.05 weight %,
impurities
<0.05 each weight %,
<0.25 total weight %,
Al
balance
wherein the aluminum alloy casting alloy is grain refined using aluminum-titanium-boron and/or aluminum-titanium-carbon containing grain refiner;
wherein the aluminum alloy casting alloy is cast in a sand, ceramic or metal mold to form the cast product;
wherein the aluminum alloy cast product is hot isostatically pressed (HIP'ed) at 950-975° F. (510-524° C.), 15,000+/−500 psi (103+/−3.4 MPa) for 2 to 3 hours, solution treated at 950-960° F. (510-516° C.) for 2-4 hours followed by 980-1005° F. (527-541° C.) for 16-120 hours followed by quenching in water and naturally aged at room temperature or artificially aged at 310-390° F. (154-199° C.) for 1 to 96 hours;
whereby the aluminum alloy product in the naturally aged condition T4 has a minimum ultimate tensile strength of 57,100 psi (394 MPa), a minimum 0.2% offset yield strength of 38,500 psi (265 MPa), a minimum elongation of 6.2%, a minimum unnotched impact strength of 88 joules/cm 2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 30,000 psi (207 MPa);
whereby the aluminum alloy product in the artificially aged condition T6 has a minimum ultimate tensile strength of 61,500 psi (424 MPa), a minimum 0.2% offset yield strength of 47,800 psi (330 MPa) and a minimum elongation of 3.1%;
whereby the aluminum alloy product in the artificially aged condition T7 has a minimum ultimate tensile strength of 48,600 psi (335 MPa), a minimum 0.2% offset yield strength of 43,900 psi (303 MPa), a minimum elongation of 1.0%, a minimum unnotched impact strength of 28 joules/cm 2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 40,000 psi (276 MPa);
whereby the aluminum alloy product in the artificially aged condition T61 has an average ultimate tensile strength of 69,660 psi (480 MPa), an average 0.2% offset yield strength of 59,390 psi (409 MPa), an average elongation of 6.3% an average unnotched impact strength of 41 joules/cm 2 and has similar ballistic performance to aluminum alloy wrought alloy 2519 in the T87 condition.
8 . An aluminum alloy cast product according to claim 7 , wherein, before the aluminum alloy cast product is hot isostatically pressed, it is solution treated at 950-960° F. (510-516° C.) for 2-4 hours followed by 980-1005° F. (527-541° C.) for 16-120 hours followed by quenching in water.
9 . An aluminum alloy cast product according to claim 7 , wherein the sand cast aluminum alloy product is a seat frame of a military vehicle.
10 . An aluminum alloy cast product according to claim 7 , wherein the sand cast aluminum alloy product is a turret rotor of a military weapon system.
11 . An aluminum alloy cast product according to claim 7 , wherein the sand cast aluminum alloy product is a hatch of a military weapon system.
12 . An aluminum alloy cast product according to claim 7 , wherein the sand cast aluminum alloy product is ballistic armor.
13 . An aluminum alloy cast product according to claim 7 , wherein the aluminum alloy product is welding wire.
14 . An aluminum alloy cast product consisting essentially of:
Cu
5.00-6.25 weight %,
Mg
0.20-0.50 weight %,
Mn
0.20-0.65 weight %,
Ti
0.05-0.40 weight %,
Ag
0.00-0.40 weight %,
Cr
0.00-0.20 weight %,
V
0.05-0.25 weight %,
Zr
0.05-0.25 weight %,
Fe
<0.15 weight %,
Si
<0.15 weight %,
Ni
<0.05 weight %,
Zn
<0.05 weight %,
impurities
<0.05 each weight %,
<0.25 total weight %,
Al
balance
wherein the aluminum alloy casting alloy is grain refined using aluminum-titanium-boron and/or aluminum-titanium-carbon containing grain refiner;
wherein the aluminum alloy casting alloy is cast in a sand mold,
wherein the aluminum alloy cast product is hot isostatically pressed (HIP'ed) at 950-975° F. (510-524° C.), 15,000+/−500 psi (103+/−3.4 MPa) for 2 to 3 hours, solution treated at 980-1005° F. (527-541° C.) for 16-120 hours followed by quenching in water and naturally aged at room temperature or artificially aged at 310-390° F. (154-199° C.) for 12 to 96 hours.
15 . An aluminum alloy cast product according to claim 14 , wherein the sand cast aluminum alloy product is a seat frame of a military vehicle.
16 . An aluminum alloy cast product according to claim 14 , wherein the sand cast aluminum alloy product is a turret rotor of a military weapon system.
17 . An aluminum alloy cast product according to claim 14 , wherein the sand cast aluminum alloy product is a hatch of a military weapon system.
18 . An aluminum alloy cast product according to claim 14 , wherein the sand cast aluminum alloy product is ballistic armor.
19 . An aluminum alloy cast product according to claim 14 , wherein the aluminum alloy product is welding wire.
20 . An aluminum alloy cast product consisting essentially of:
Cu
5.00-6.25 weight %,
Mg
0.20-0.50 weight %,
Mn
0.20-0.65 weight %,
Ti
0.05-0.40 weight %,
Ag
0.00-0.40 weight %,
Cr
0.00-0.20 weight %,
V
0.05-0.25 weight %,
Zr
0.05-0.25 weight %,
Fe
<0.15 weight %,
Si
<0.15 weight %,
Ni
<0.05 weight %,
Zn
<0.05 weight %,
impurities
<0.05 each weight %,
<0.25 total weight %,
Al
balance
wherein the aluminum alloy casting alloy is grain refined using aluminum-titanium-boron and/or aluminum-titanium-carbon containing grain refiner;
wherein the aluminum alloy casting alloy is cast in a sand mold;
wherein the aluminum alloy product is solution treated at 950-960° F. (510-516° C.) for 2-4 hours followed by 980-1005° F. (527-541° C.) for 16-120 hours followed by quenching in water, hot isostatically pressed (HIP'ed) at 950-975° F. (510-524° C.), 15,000+/−500 psi (103+/−3.4 MPa) for 2 to 3 hours, solution treated at 980-1005° F. (527-541° C.) for 16-120 hours followed by quenching in water and naturally aged at room temperature or artificially aged at 310-390° F. (154-199° C.) for 12 to 96 hours;
whereby the aluminum alloy product in the naturally aged condition T4 has a minimum ultimate tensile strength of 61,000 psi (420 MPa), a minimum 0.2% offset yield strength of 38,500 psi (265 MPa), a minimum elongation of 10.9%, a minimum unnotched impact strength of 88 joules/cm 2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 30,000 psi (207 MPa);
whereby the aluminum alloy product in the artificially aged condition T6 has a minimum ultimate tensile strength of 66,600 psi (459 MPa), a minimum 0.2% offset yield strength of 47,800 psi (330 MPa), a minimum elongation of 4.9%, a minimum unnotched impact strength of 40 joules/cm 2 and nearly passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 40,000 psi (276 MPa);
whereby the aluminum alloy product in the artificially aged condition T61 has an average ultimate tensile strength of 69,660 psi (480 MPa), an average 0.2% offset yield strength of 59,390 psi (409 MPa), an average elongation of 6.3%, an average unnotched impact strength of 41 joules/cm 2 and similar ballistic performance to aluminum alloy wrought alloy 2519 in the T87 condition;
whereby the aluminum alloy product in the artificially aged condition T7 has a minimum ultimate tensile strength of 59,700 psi (412 MPa), a minimum 0.2% offset yield strength of 43,900 psi (303 MPa), a minimum elongation of 3.9%, a minimum unnotched impact strength of 28 joules/cm 2 and passes the ASTM G47 test for resistance to stress corrosion cracking at an applied stress of 40,000 psi (276 MPa).
21 . An aluminum alloy cast product according to claim 20 , wherein the sand cast aluminum alloy product is a seat frame of a military vehicle.
22 . An aluminum alloy cast product according to claim 20 , wherein the sand cast aluminum alloy product is a turret rotor of a military weapon system.
23 . An aluminum alloy cast product according to claim 20 , wherein the sand cast aluminum alloy product is a hatch of a military weapon system.
24 . An aluminum alloy cast product according to claim 20 , wherein the sand cast aluminum alloy product is ballistic armor.
25 . An aluminum alloy cast product according to claim 20 , wherein the aluminum alloy product is welding wire.
26 . An aluminum alloy casting alloy consisting essentially of:
Cu
5.00-6.25
weight %,
Mg
0.20-0.50
weight %,
Mn
0.20-0.65
weight %,
Ti
0.05-0.40
weight %,
Ag
<0.40
weight %,
Cr
<0.20
weight %,
V
<0.05
weight %,
Zr
<0.10
weight %,
Fe
<0.15
weight %,
Si
<0.15
weight %,
Ni
<0.05
weight %,
Zn
<0.05
weight %,
impurities
<0.05
eachweight %,
<0.25
total weight %,
Al
balance
wherein the aluminum alloy casting alloy is grain refined using aluminum-titanium-boron and/or aluminum-titanium-carbon containing grain refiner;
wherein the aluminum alloy casting alloy is cast in a sand mold to form a cast product; and
wherein the aluminum alloy cast product is solution treated at 950-960° F. (510-516° C.) for 2-4 hours followed by 980-1005° F. (527-541° C.) for 16-120 hours followed by quenching in water, hot isostatically pressed (HIP'ed) at 950-975° F. (510-524° C.), 15,000+/−500 psi (103+/−3.4 MPa) for 2 to 3 hours, solution treated at 980-1005° F. (527-541° C.) for 16-120 hours followed by quenching in water and naturally aged at room temperature or artificially aged at 310-390° F. (154-199° C.) for 12 to 96 hours;
whereby the aluminum alloy cast product in the naturally aged condition T4 has a minimum ultimate tensile strength of 60,800 psi (419 MPa), a minimum 0.2% offset yield strength of 40,800 psi (287 MPa) and a minimum elongation of 12.4%; and
whereby the aluminum alloy product in the artificially aged condition T6 has a minimum ultimate tensile strength of 67,300 psi (464 MPa), a minimum 0.2% offset yield strength of 52,600 psi (362 MPa) and a minimum elongation of 6.5%;
27 . An aluminum alloy cast product according to claim 26 , wherein the sand cast aluminum alloy product is a seat frame of a military vehicle.
28 . An aluminum alloy cast product according to claim 26 , wherein the sand cast aluminum alloy product is a turret rotor of a military weapon system.
29 . An aluminum alloy cast product according to claim 26 , wherein the sand cast aluminum alloy product is a hatch of a military weapon system.
30 . An aluminum alloy cast product according to claim 26 , wherein the sand cast aluminum alloy product is ballistic armor.
31 . An aluminum alloy cast product according to claim 26 , wherein the aluminum alloy product is welding wire.Join the waitlist — get patent alerts
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