Abstract: In a fusion-metallurgical process of producing fine-grained hereogeneous, ductile alloys which contain Mg.sub.2 Si, the grain size of the Mg.sub.2 Si crystallites formed by primary solidification is kept below 30 .mu.m by doping the molten alloy with 0.05 to 2% by weight of phosphorus.
Type:
Grant
Filed:
May 7, 1991
Date of Patent:
August 25, 1992
Assignee:
Metallgesellschaft Aktiengesellschaft
Inventors:
Eberhard E. Schmid, Kersten V. Oldenburg, Georg Frommeyer
Abstract: Process for economically obtaining a magnesium alloy having improved mechanical characteristics and in particular a breaking strength of at least 290 MPa and an elongation at break of at least 5%, by spraying and deposition in solid form to provide an ingot with the following weight composition: Al 2-9%; Zn 0-4%; Mn 0-1%; Ca 0.5-5%; RE 0-4% (rare earths); and, with the main impurities, the remainder being magnesium. The ingot undergoes a consolidation treatment by thermal deformation at between 200.degree. and 250.degree. C. The alloys obtained by the process are constituted by a homogeneous magnesium matrix with the grain size between 3 and 25 .mu.m and particles of intermetallic compounds.
Abstract: Magnesium alloy having a breaking load of at least 290 MPa, more particularly at least 330 MPa, having the following composition by weight: Al 2-11%, Zn 0-12%, Mn 0-0.6%, Ca 0-7%, but with the presence of at least Zn and/or Ca, having a mean particle size less than 3 .mu.m, a homogeneous matrix reinforced with intermetallic compounds having a size less than 1 .mu.m precipitated at the grain boundaries, this structure remaining unchanged after storage at 200.degree. C. for 24 hours; and a process for producing it by rapid solidification and consolidation by extrusion at a temperature between 200.degree. and 350.degree. C.
Type:
Grant
Filed:
October 25, 1989
Date of Patent:
March 5, 1991
Assignees:
Pechiney Electrometallurgie, Norsk Hydro A.S.
Inventors:
Gilles Regazzoni, Gilles Nussbaum, Haavard T. Gjestland
Abstract: A complex part composed of rapidly solidified magnesium base metal alloy is produced by superplastic forming at a temperature ranging from 160.degree. C. to 275.degree. C. and at a rate ranging from 0.00021 m/sec. to 0.00001 m/sec., to improve the formability thereof and allow forming to be conducted at lower temperatures. The rapidly solidified magnesium based alloy has a composition consisting essentially of the formula Mg.sub.bal Al.sub.a Zn.sub.b X.sub.c, wherein X is at least one element selected from the group consisting of manganese, cerium, neodymium, praseodymium and yttrium, "a" range from 0 to about 15 atom percent, "b" ranges from 0 to about 4 atom percent and "c" ranges from about 0.2 to 3 atom percent, the balance being magnesium and incidental impurities, with the proviso that the sum of aluminum and zinc present ranges from about 2 to 15 atom percent. Such an alloy contains fine grain size and finely dispersed magnesium-, aluminum- rare earth intermetallic phases.
Type:
Grant
Filed:
May 23, 1988
Date of Patent:
July 3, 1990
Assignee:
Allied-Signal Inc.
Inventors:
Santosh K. Das, Chin-Fong Chang, Derek Raybould
Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be a highly desirable effective aluminum concentration by addition of vanadium and rapid solidification from the melt according to the approximate formula Ti.sub.49 Al.sub.48 V.sub.3.
Type:
Grant
Filed:
December 28, 1987
Date of Patent:
August 15, 1989
Assignee:
General Electric Company
Inventors:
Shyh-Chin Huang, Michael F. X. Gigliotti, Jr.
Abstract: A photoengraving article is provided formed of an essentially zinc-free magnesium-based alloy which also contains an amount of calcium effective to control lateral etching and improvement the sharpness of the resultant etched pattern. A method of forming a photoengraved article is also provided. The method comprises the steps of forming a photoengraving article from a photoengraving alloy and etching a pattern on the article in an etching bath. The improvement that comprises forming the photoengraving article from essentially zinc-free magnesium-based alloys containing an amount of calcium effective to control the lateral etching and improve the clarity of the resultant pattern. The article and method do not release zinc into the etching bath. Ultimate release of zinc into the environment is also reduced.
Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be highly desirable effective aluminum concentration by addition of tantalum according to the approximate formula Ti.sub.48 Al.sub.48 Ta.sub.4.
Type:
Grant
Filed:
December 28, 1987
Date of Patent:
June 27, 1989
Assignee:
General Electric Company
Inventors:
Huang Shyh-Chin, Michael F. X. Gigliotti, Jr.
Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be a highly desirable effective aluminum concentration by addition of chromium according to the approximate formula Ti.sub.52-50 Al.sub.46-48 Cr.sub.2.
Type:
Grant
Filed:
December 28, 1987
Date of Patent:
June 27, 1989
Assignee:
General Electric Company
Inventors:
Shyh-Chin Huang, Michael F. X. Gigliotti, Jr.
Abstract: A photoengraving article is provided formed of an essentially zinc-free magnesium-based alloy which also contains an amount of calcium effective to control lateral etching and improvement the sharpness of the resultant etched pattern. A method of forming a photoengraved article is also provided. The method comprises the steps of forming a photoengraving article from a photoengraving alloy and etching a pattern on the article in an etching bath. The improvement that comprises forming the photoengraving article from essentially zinc-free magnesium-based alloys containing an amount of calcium effective to control the lateral etching and improve the clarity of the resultant pattern. The article and method do not release zinc into the etching bath. Ultimate release of zinc into the environment is also reduced.
Abstract: A rapidly solidified magnesium based alloy contains finely dispersed magnesium intermetallic phases. The alloy has the form of a filament or a powder and is especially suited for consolidation into bulk shapes having superior mechanical properties and corrosion resistance.
Type:
Grant
Filed:
June 7, 1984
Date of Patent:
June 23, 1987
Assignee:
Allied Corporation
Inventors:
Santosh K. Das, Derek Raybould, Richard L. Bye, Jr., Chin-Fong Chang
Abstract: A composite material made of a matrix of a first metal and reinforcing first particles with average particle diameter less than or equal to about ten microns dispersed in the first metal matrix, with the reinforcing first particles each having a composite structure, being made up of a plurality of fine second particles of a ceramic made by reacting together a second metal and a gas and being combined with one another by a matrix of a third metal.
Abstract: A magnesium alloy contains the following additives: A1 1-9%, Zn 0-4%, Sn 0.1-5%, Mn 0-1%. It is useful as an anode in cells operating with a salt water electrolyte, especially in batteries powering equipment for deep-sea use in which a pulsed power source is required.