Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2006-09-12
2006-09-12
King, Roy (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S697000, C148S694000
Reexamination Certificate
active
07105067
ABSTRACT:
A method to increase the toughness of the aluminum-lithium alloy C458 and similar alloys at cryogenic temperatures above their room temperature toughness is provided. Increasing the cryogenic toughness of the aluminum-lithium alloy C458 allows the use of alloy C458 for cryogenic tanks, for example for launch vehicles in the aerospace industry. A two-step aging treatment for alloy C458 is provided. A specific set of times and temperatures to age the aluminum-lithium alloy C458 to T8 temper is disclosed that results in a higher toughness at cryogenic temperatures compared to room temperature. The disclosed two-step aging treatment for alloy 458 can be easily practiced in the manufacturing process, does not involve impractical heating rates or durations, and does not degrade other material properties.
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“Alternate Heat Treatments of C458 Aluminum Lithium Alloy”, Parrish et al, Materials Science Forum vols. 331-337 (2000) pp 655-662.
Babel Henry W.
Sankaran Krishnan K.
Sova Brian J.
King Roy
Morillo Janelle
Shimokaji & Associates P.C.
The Boeing Company
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