[미국특허]
Hot and cold rolling high strength L12 aluminum alloys
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B22F-003/14
B22F-003/24
C22C-001/04
출원번호
US-0589039
(2009-10-16)
등록번호
US-8409497
(2013-04-02)
발명자
/ 주소
Pandey, Awadh B.
출원인 / 주소
United Technologies Corporation
대리인 / 주소
Kinney & Lange, P.A.
인용정보
피인용 횟수 :
1인용 특허 :
78
초록
A method and apparatus for producing high strength aluminum alloys from a powder containing Ll2 intermetallic dispersoids. The powder is degassed, sealed under vacuum in a container, consolidated by vacuum hot pressing, extruded into a rolling preform and rolled into a usable part.
대표청구항▼
1. A method for forming a high strength aluminum alloy billet containing Ll2 dispersoids, comprising the steps of: placing in a container a quantity of an aluminum alloy powder containing an Ll2 dispersoid Ll2 comprising Al3X dispersoids wherein X is at least one first element selected from the grou
1. A method for forming a high strength aluminum alloy billet containing Ll2 dispersoids, comprising the steps of: placing in a container a quantity of an aluminum alloy powder containing an Ll2 dispersoid Ll2 comprising Al3X dispersoids wherein X is at least one first element selected from the group consisting of: about 0.1 to about 4.0 weight percent scandium, about 0.1 to about 20.0 weight percent erbium, about 0.1 to about 15.0 weight percent thulium, about 0.1 to about 25.0 weight percent ytterbium, and about 0.1 to about 25.0 weight percent lutetium;at least one second element selected from the group consisting of about 0.1 to about 20.0 weight percent gadolinium, about 0.1 to about 20.0 weight percent yttrium, about 0.05 to about 4.0 weight percent zirconium, about 0.05 to about 10.0 weight percent titanium, about 0.05 to about 10.0 weight percent hafnium, and about 0.05 to about 5.0 weight percent niobium; andthe balance substantially aluminum;the alloy powder having a mesh size of less than 450 mesh in a container,vacuum degassing the powder at a temperature of about 300° F. (149° C.) to about 900° F. (482° C.) for about 0.5 hours to about 8 days;sealing the degassed powder in the container under vacuum;heating the sealed container at about 300° F. (149° C.) to about 900° F. (482° C.) for about 15 minutes to eight hours;vacuum hot pressing the heated container to form a billet;removing the container from the formed billet;extruding the billet into a rolling preform with a rectangular cross section; androlling the preform into a useful shape, wherein the rolling is carried out after soaking the material at temperature from about 250° F. (121° C.) to about −900° F. (482° C.) for about 2 hours to 8 hours and include a plurality of passes wherein the rolling is carried out with an intermediate anneal after each pass at temperatures from about 250° F. (121° C.) to about 900° F. (482° C.) for about 0.25 hour to 1 hour. 2. The method of claim 1, wherein the degassing includes rotating the aluminum alloy powder to heat and expose all the powder to vacuum. 3. The method of claim 1, wherein the vacuum hot pressing is carried out at a temperature of from about 400° F. (204° C.) to about 1000° F. (537° C.). 4. The method of claim 1, wherein the rolling is carried out in a plurality of reduction passes at a temperature selected from about 250° F. (121° C.) to about 900° F. (482° C.), at a strain rate of from about 0.1 min−1 to about 25 min−1 with strain for each reduction pass at about 5 percent to 30 percent and at room temperature with strain for each reduction pass from about 2 percent to 10 percent. 5. The method of claim 1, wherein the aluminum alloy powder contains at least one third element selected from the group consisting of silicon, magnesium, manganese, lithium, copper, zinc, and nickel, and wherein the third element comprises at least one of about 4 to about 25 weight percent silicon, about 1 to about 8 weight percent magnesium, (0.1-3) weight percent manganese, about 0.5 to about 3 weight percent lithium, about 0.2 to about 6 weight percent copper, about 3 to about 12 weight percent zinc, about 1 to about 12 weight percent nickel. 6. A method for forming a high strength aluminum alloy billet containing Ll7 dispersoids, comprising the steps of: placing in a container a quantity of an aluminum alloy powder containing an Ll2 dispersoid Ll2 comprising Al3X dispersoids wherein X is at least one first element selected from the group consisting of: about 0.1 to about 4.0 weight percent scandium, about 0.1 to about 20.0 weight percent erbium, about 0.1 to about 15.0 weight percent thulium, about 0.1 to about 25.0 weight percent ytterbium, and about 0.1 to about 25.0 weight percent lutetium;at least one second element selected from the group consisting of about 0.1 to about 20.0 weight percent gadolinium, about 0.1 to about 20.0 weight percent yttrium, about 0.05 to about 4.0 weight percent zirconium, about 0.05 to about 10.0 weight percent titanium, about 0.05 to about 10.0 weight percent hafnium, and about 0.05 to about 5.0 weight percent niobium; andthe balance substantially aluminum;the alloy powder having a mesh size of less than 450 mesh in a container,vacuum degassing the powder at a temperature of about 300° F. (149° C.) to about 900° F. (482° C.) for about 0.5 hours to about 8 days;sealing the degassed powder in the container under vacuum;heating the sealed container at about 300° F. (149° C.) to about 900° F. (482° C.) for about 15 minutes to eight hours;vacuum hot pressing the heated container to form a billet;removing the container from the formed billet;extruding the billet into a rolling preform with a rectangular cross section; and rolling the preform into a useful shape, wherein the tensile strength of rolled Ll2 alloy billet is about 117 ksi (807 MPa), the yield strength of rolled alloy billet is about 110 ksi (758 MPa), the elongation of rolled Ll2 alloy billet is over 12 percent, the reduction in area of rolled Ll2 alloy billet is over 21 percent, and the rolled Ll2 aluminum alloys have tensile strengths of about 40 ksi (276 MPa) at a temperature of 650° F. (343° C.).
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