Metal treatment – Stock – Aluminum base
Reexamination Certificate
2003-01-22
2008-10-14
Sheehan, John P. (Department: 1793)
Metal treatment
Stock
Aluminum base
C419S038000, C419S066000, C148S437000
Reexamination Certificate
active
07435306
ABSTRACT:
High strength aluminum alloy rivets are provided in which the aluminum alloys exhibit high strength at atmospheric temperatures and maintain high strength and ductility at extremely low temperatures. The rivets are produced from an alloy which is made by blending about 89 atomic % to 99 atomic % aluminum, 1 atomic % to 11 atomic % of a secondary metal selected from the group consisting of magnesium, lithium, silicon, titanium, zirconium, and combinations thereof, and up to about 10 atomic % of a tertiary metal selected from the group consisting of Be, Ca, Sr, Ba, Ra, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, W, and combinations thereof. The alloy is produced by nanostructure material synthesis, such as cryomilling, in the absence of extrinsically added refractory dispersoids. The synthesized alloy is then consolidated and formed into a solid or blind rivet. Grain size within the rivet is less than 0.5 μm, and the rivet has exceptional thermal stability, resistance to strain localization cracking during rivet head upsetting, and resistance to stress corrosion cracking during service.
REFERENCES:
patent: 3172546 (1965-03-01), Schreiner
patent: 3740210 (1973-06-01), Bomford et al.
patent: 3771480 (1973-11-01), Johnson
patent: 3771729 (1973-11-01), Frable
patent: 3791800 (1974-02-01), McGee
patent: 3960607 (1976-06-01), Manzonelli et al.
patent: 4069042 (1978-01-01), Buchovecky et al.
patent: 4090874 (1978-05-01), Kaufman
patent: 4113472 (1978-09-01), Fister, Jr. et al.
patent: 4129443 (1978-12-01), Kaufman
patent: 4239159 (1980-12-01), Johns
patent: 4620886 (1986-11-01), Wincierz et al.
patent: 4627959 (1986-12-01), Gilman et al.
patent: 4647304 (1987-03-01), Petkovic-Luton et al.
patent: 4722751 (1988-02-01), Akechi et al.
patent: 4772342 (1988-09-01), Polmear
patent: 4818481 (1989-04-01), Luton et al.
patent: 4853179 (1989-08-01), Shiina
patent: 4909867 (1990-03-01), Masumoto et al.
patent: 4992242 (1991-02-01), Faure
patent: 4996014 (1991-02-01), Suvanto
patent: 5053084 (1991-10-01), Masumoto et al.
patent: 5565169 (1996-10-01), Webster
patent: 5580666 (1996-12-01), Dubensky et al.
patent: 5728479 (1998-03-01), Childree et al.
patent: 5775603 (1998-07-01), Kohler et al.
patent: 5902943 (1999-05-01), Schaffer et al.
patent: 6027582 (2000-02-01), Shahani et al.
patent: 6171038 (2001-01-01), Pratt et al.
patent: 6248188 (2001-06-01), Smolej et al.
patent: 6267684 (2001-07-01), Luhm
patent: 6315842 (2001-11-01), Shahani et al.
patent: 6402860 (2002-06-01), Hashikura et al.
patent: 6468468 (2002-10-01), Neubing et al.
patent: 6544357 (2003-04-01), Hehmann et al.
patent: WO 00/27559 (2000-05-01), None
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Liao, X.Z. et al., Deformation mechanisms at different grain sizes in a cryogenically ball—milled Al—Mg alloy, Ultrafine Grained Materials II (2002), 323-330, Photomicrographs, Diffraction Patterns, 16 Ref. Minerals, Metals and Materials Society/Aime, Warrendale, PA; Conference: Ultrafine Grained Materials II.
Aikin, B..J.M. et al, Improvements in cryomill processing. Advanced Particulate Materials & Processes 1997, 287-294, Graphs, 6 Ref. Metal Powder Industries Federation, Princeton, NJ; Conference: 5th International Conference on Advanced Particulate Materials & Proce.
Lee, Z. et al., Microstructural evolution of cryomilled nanocrystalline Al-Ti-Cu alloy, Ultrafine Grained Materials II (2002), 653-659, Diffraction Patters, Photomicrographs, Graphs, 10 Ref. Minerals, Metals and Materials Society/Aime, Warrendale, PA; Conference: Ultrafine Grained Materials II.
Choi, J.H. et al., Consolidation behavior of nanocrystalline Al -5at.%Ti alloys synthesized by cryogenic milling, Journal of Alloys and Compounds (Feb. 9, 2001) 315, (1-2), 178-186, Diffraction Patterns, Photomicrographs, Graphs, 22 Ref. ISSN: 0925-8388.
Han, B.Q. et al., High-temperature mechanical behavior of a nanostructured Al- 7.5%Mg-0.3%Sc alloy, First and Second International Symposia On Superplasticity and Superplastic forming Technology: Proceedings From material Solutions 2001 and 2002 (2003), 33-38, Graphs, Photomicrographs, 19 Ref. ASM Itnernational. Member/customer Service Center, MAT.
Zhou F. et al, Thermally Stable Nanocrystalline AL-MG Alloy Powders Produced by Cryomilling, Materials Science Forum vols. 386-388 (2002) pp. 409-414, 2002 Trans Tech Publications, Switzerland.
International Search Report for PCT/US2004/000701.
Written Opinion for PCT/US2004/000701.
Bampton Clifford C.
Wooten John R.
Alston & Bird LLP
Roe Jessee R.
Sheehan John P.
The Boeing Company
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