Influence of Corrosion on the Fatigue Properties of Al 7075-T6

    Volume 26, Issue 3 (May 1998)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 9


    Du, ML
    Research assistant and leading professor, Department of Mechanical Engineering, and research assistant and professor, Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, NY

    Chiang, FP
    Research assistant and leading professor, Department of Mechanical Engineering, and research assistant and professor, Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, NY

    Kagwade, SV
    Research assistant and leading professor, Department of Mechanical Engineering, and research assistant and professor, Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, NY

    Clayton, CR
    Research assistant and leading professor, Department of Mechanical Engineering, and research assistant and professor, Department of Materials Science and Engineering, State University of New York at Stony Brook, Stony Brook, NY

    (Received 18 July 1996; accepted 10 November 1997)

    Abstract

    Chloride ion attack on Al 7075-T6 in aqueous hydrochloric acid leads to localized corrosion and subsequent initiation of fatigue cracks on the surface. Pitting is observed when the specimen is exposed to a corrosive environment. Microcracks, voids, extrusions, and intrusions are then formed during the fatigue process. From a global viewpoint, all of the corrosion and fatigue damage appears to be randomly oriented, resulting in a change in the surface roughness. The Laser Speckle Sensor technique is used to detect the minute surface texture change, associated with the damage caused by corrosion and fatigue. Nonuniform surface roughness is observed due to corrosion. The corrosion pits tend to coalesce along the rolling direction. The change in surface roughness is significant around the crack tip during the fatigue process. As a result there are synergistic activities; the surface roughness caused by corrosion and fatigue leads to crack initiation, and the crack growth further increases surface roughness.


    Paper ID: JTE12000J

    DOI: 10.1520/JTE12000J

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    Author
    Title Influence of Corrosion on the Fatigue Properties of Al 7075-T6
    Symposium , 0000-00-00
    Committee E28