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.

Subject
Risers, Environmental cracking, Test methods, Flow patterns, Crack growth, Materials, Aircraft, Extrusion, Structures, Corrosion resistance, Aluminum alloys, Grain, Conductivity
Keywords:
aging aircraft, AA7249, aluminum extrusions, environmentally assisted cracking, grain orientation
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2003
GOV
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