Process for thermal aging of aluminum alloy plate
First Claim
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1. In a method of producing an aluminum alloy product prepared from an 8090 Al-Li-Cu-Mg-Zr alloy cast ingot wherein the cast ingot is hot worked into a wrought product then solution heat treated, quenched, stretched 2 to 4 percent to the T351 condition, the improvement comprising subsequently subjecting the product to a thermal aging treatment by a single exposure to a temperature of about 170°
- C. +/-2°
C. for about 32 +/-0.5 hours to obtain improved fracture toughness and fatigue resistance.
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Abstract
A method is disclosed for preparing an improved aluminum alloy plate product wherein the plate produced from an Al-Li-Cu-Mg alloy in the T351 condition is subjected to a thermal aging treatment wherein the plate is exposed to a temperature of about 170° C.±2° C. for about 32 hours ±0.5 hours.
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2 Claims
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1. In a method of producing an aluminum alloy product prepared from an 8090 Al-Li-Cu-Mg-Zr alloy cast ingot wherein the cast ingot is hot worked into a wrought product then solution heat treated, quenched, stretched 2 to 4 percent to the T351 condition, the improvement comprising subsequently subjecting the product to a thermal aging treatment by a single exposure to a temperature of about 170°
- C. +/-2°
C. for about 32 +/-0.5 hours to obtain improved fracture toughness and fatigue resistance. - View Dependent Claims (2)
- C. +/-2°
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Current AssigneeNorthrop Corporation
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Original AssigneeNorthrop Corporation
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InventorsOzelton, Malcolm W., Averill, Stephan W., Scuttl, James J., Scarich, Gregory V., Bohlen, James W.
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Primary Examiner(s)Lechert, Jr., Stephen J.
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Application NumberUS06/917,630Time in Patent Office872 DaysField of Search148/11.5 A, 148/12.7 A, 148/159, 148/439US Class Current148/693CPC Class CodesC22F 1/04 of aluminium or alloys base...
