Jen Chwen Lin

US Patent:

6733566, May 11, 2004

Filed:

Jun 9, 2003

Appl. No.:

10/457269

Inventors:

Jen C. Lin - Export PA
Timothy A. Kuhn - Frederick MD
Holger Haddenhorst - Gelsenkirchen, DE

Assignee:

Alcoa Inc. - Pittsburgh PA

International Classification:

C22B 2106

US Classification:

75709, 75604, 75684, 164 551, 164123, 420590

Abstract:

A method for preventing oxidation of molten aluminum alloy and magnesium alloy surfaces, the method comprising providing a molten aluminum alloy or magnesium alloy having a molten aluminum or magnesium alloy surface; covering the molten aluminum or magnesium alloy surface with an initial layer of petroleum coke, the initial layer of petroleum coke having an initial layer thickness of about 0. 75 inches; oxidizing a portion of the initial layer of petroleum coke to form a working layer of petroleum coke covering the molten metal surface, the working layer of coke having a working layer thickness of about 0. 5 inches, and a layer of carbon dioxide immediately adjacent to and contiguous with the working layer of petroleum coke; and adding additional petroleum coke to the working layer of petroleum coke to maintain the working layer thickness at about 0. 5 inches.

US Patent:

6773666, Aug 10, 2004

Filed:

Feb 27, 2003

Appl. No.:

10/376913

Inventors:

Jen C. Lin - Export PA
Carl E. Garesche - Streetsboro OH
Holger Haddenhorst - Gelsenkirchen, DE

Assignee:

Alcoa Inc. - Pittsburgh PA

International Classification:

C22C 2102

US Classification:

420546, 420548, 420544

Abstract:

An improved AlâSiâMgâMn casting alloy that consists essentially of: about 6. 0-9. 0 wt. % silicon, about 0. 2-0. 8 wt. % magnesium, about 0. 1-1. 2 wt. % manganese, less than about 0. 15 wt. % iron, less than about 0. 3 wt. % titanium and less than about 0. 04 wt. % strontium, the balance aluminum. Preferrably, this casting alloy is substantially copper-free, chromium-free and beryllium-free.

US Patent:

6783730, Aug 31, 2004

Filed:

Dec 20, 2002

Appl. No.:

10/325561

Inventors:

Jen C. Lin - Export PA
Vadim S. Zolotorevsky - Moscow, RU
Michael V. Glazoff - Pittsburgh PA
Shawn J. Murtha - Monroeville PA
Nicholas A. Belov - Moscow, RU

Assignee:

Alcoa Inc. - Pittsburgh PA

International Classification:

C22C 2100

US Classification:

420550, 420551, 420553

Abstract:

There is claimed an AlâNiâMn based alloy for die casting, squeeze casting, permanent mold casting, sand casting and/or semi-solid metal forming. The composition of this alloy includes, by weight percent: about 2-6% Ni, about 1-3% Mn, less than about 1% Fe, less than about 1% Si, the balance Al, incidental elements and impurities. It is suitable for aerospace and automotive cast parts.

US Patent:

7087125, Aug 8, 2006

Filed:

Jan 28, 2005

Appl. No.:

11/045845

Inventors:

Jen C. Lin - Export PA, US
Cagatay Yanar - Pittsburgh PA, US
Wenping Zhang - Murrysville PA, US
Pål S. Jacobsen - Farsund, NO
Geir Grasmo - Mandal, NO
Michael K. Brandt - Murrysville PA, US
Moustapha Mbaye - Ada MI, US
Martijn Vos - Böblingen, DE
Michael V. Glazoff - Murrysville PA, US
Knut Pettesen - Farsund, NO
Svein Jorgensen - Kristiansand, NO
Terje Johnsen - Vanse, NO

Assignee:

Alcoa Inc. - Pittsburgh PA

International Classification:

C22C 21/02

US Classification:

148417, 420532

Abstract:

An aluminum alloy for shaped castings, the alloy having the following composition ranges in weight percent: about 6. 0–8. 5% silicon, less than 0. 4% magnesium, less than 0. 1% cerium, less than 0. 2% iron, copper in a range from about 0. 1% to about 0. 5% and/or zinc in a range from about 1% to about 4%, the alloy being particularly suited for T5 heat treatment.

US Patent:

7449073, Nov 11, 2008

Filed:

Sep 7, 2005

Appl. No.:

11/220424

Inventors:

Jen C. Lin - Export PA, US
John M. Newman - Export PA, US
Paul E. Magnusen - Pittsburgh PA, US
Gary H. Bray - Murrysville PA, US

Assignee:

Alcoa Inc. - Pittsburgh PA

International Classification:

C22C 21/12

US Classification:

148417, 420533, 420539

Abstract:

The invention provides a 2000 series aluminum alloy having enhanced damage tolerance, the alloy consisting essentially of about 3. 0-4. 0 wt % copper; about 0. 4-1. 1 wt % magnesium; up to about 0. 8 wt % silver; up to about 1. 0 wt % Zn; up to about 0. 25 wt % Zr; up to about 0. 9 wt % Mn; up to about 0. 5 wt % Fe; and up to about 0. 5 wt % Si, the balance substantially aluminum, incidental impurities and elements, said copper and magnesium present in a ratio of about 3. 6-5 parts copper to about 1 part magnesium. The alloy is suitable for use in wrought or cast products including those used in aerospace applications, particularly sheet or plate structural members, extrusions and forgings, and provides an improved combination of strength and damage tolerance.

US Patent:

7547366, Jun 16, 2009

Filed:

Jul 15, 2004

Appl. No.:

10/893003

Inventors:

Jen C. Lin - Export PA, US
John M. Newman - Export PA, US
Paul E. Magnusen - Pittsburgh PA, US
Gary H. Bray - Murrysville PA, US

Assignee:

Alcoa Inc. - Pittsburgh PA

International Classification:

C22C 21/12

US Classification:

148417, 420533, 420539

Abstract:

The invention provides a 2000 series aluminum alloy having enhanced damage tolerance, the alloy consisting essentially of about 3. 0-4. 0 wt % copper; about 0. 4-1. 1 wt % magnesium; up to about 0. 8 wt % silver; up to about 1. 0 wt % Zn; up to about 0. 25 wt % Zr; up to about 0. 9 wt % Mn; up to about 0. 5 wt % Fe; and up to about 0. 5 wt % Si, the balance substantially aluminum, incidental impurities and elements, said copper and magnesium present in a ratio of about 3. 6-5 parts copper to about 1 part magnesium. The alloy is suitable for use in wrought or cast products including those used in aerospace applications, particularly sheet or plate structural members, extrusions and forgings, and provides an improved combination of strength and damage tolerance.

US Patent:

7625454, Dec 1, 2009

Filed:

Jul 28, 2005

Appl. No.:

11/191757

Inventors:

Jen C. Lin - Export PA, US
Xinyan Yan - Murrysville PA, US
Cagatay Yanar - Pittsburgh PA, US
Larry D. Zellman - Yorktown VA, US
Xavier Dumant - Laval, FR
Robert Tombari - Dollard des Ormeaux, CA

Assignee:

Alcoa Inc. - Pittsburgh PA

International Classification:

C22C 21/02

US Classification:

148549, 148698, 148417, 420532, 420548

Abstract:

The present invention provides an aluminum casting alloy with a composition including 4%-9% Si; 0. 1%-0. 7% Mg; less than or equal to 5% Zn; less than 0. 15% Fe; less than 4% Cu; less than 0. 3% Mn; less than 0. 05% B; less than 0. 15% Ti; and the remainder consisting essentially of aluminum. The inventive AlSiMg composition provides increased mechanical properties (Tensile Yield Strength and Ultimate Tensile Strength) in comparison to similiarly prepared E357 alloy at room temperature and high temperature. The present invention also includes a shaped casting formed from the inventive composition and a method of forming a shaped casting from the inventive composition.

US Patent:

8083871, Dec 27, 2011

Filed:

Oct 26, 2006

Appl. No.:

11/553236

Inventors:

Jen C. Lin - Export PA, US
Moustapha Mbaye - Ada MI, US
Jan Ove Löland - Farsund, NO
Russell S. Long - Murrysville PA, US
Xinyan Yan - Murrysville PA, US

Assignee:

Automotive Casting Technology, Inc. - Fruitport MI

International Classification:

C22C 21/02
C22C 21/04

US Classification:

148440, 420546

Abstract:

The present invention provides a casting having increased crashworthiness including an aluminum alloy of about 6. 0 wt % to about 8. 0 wt % Si; about 0. 12 wt % to about 0. 25 wt % Mg; less than or equal to about 0. 35 wt % Cu; less than or equal to about 4. 0 wt % Zn; less than or equal to about 0. 6 wt % Mn; and less than or equal to about 0. 15 wt % Fe, wherein the cast body is treated to a T5 or T6 temper and has a tensile strength ranging from 100 MPa to 180 MPa and has a critical fracture strain greater than 10%. The present invention further provides a method of forming a casting having increased crashworthiness.