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03211 ENVIRONMENTALLY ASSISTED CRACKING PROPERTIES OF AA7249 EXTRUSIONS FOR AEROSPACE APPLICATIONS

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Product Number: 51300-03211-SG
ISBN: 03211 2003 CP
Author: Kristen L. Deffenbaugh, Michelle G. Koul and Angela L. Moran
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Two candidate replacement alloys are being considered as possible drop-in replacements for A7075-T6 extruded components on the P-3C aircraft (AA7150 and AA7249). Preliminary evaluation indicates that these alloys exhibit improved corrosion resistance without a sacrifice in strength. This paper describes an experimental program that contributes to the body of knowledge required to safely employ AA7249 in lieu of AA7075-T6. This study examines three extrusions and compares the mechanical and EAC properties of each. Keywords: orientation. aging aircraft, AA7249, aluminum extrusions, environmentally assisted cracking, grain
Two candidate replacement alloys are being considered as possible drop-in replacements for A7075-T6 extruded components on the P-3C aircraft (AA7150 and AA7249). Preliminary evaluation indicates that these alloys exhibit improved corrosion resistance without a sacrifice in strength. This paper describes an experimental program that contributes to the body of knowledge required to safely employ AA7249 in lieu of AA7075-T6. This study examines three extrusions and compares the mechanical and EAC properties of each. Keywords: orientation. aging aircraft, AA7249, aluminum extrusions, environmentally assisted cracking, grain
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