TY - GEN
T1 - Understanding damage accumulation upon AA7075-T651 used in airframes from a microstructural point of view
AU - Birbilis, N.
AU - Cavanaugh, M. K.
AU - Buchheit, R. G.
AU - Harlow, D. G.
AU - Wei, R. P.
PY - 2005
Y1 - 2005
N2 - Corrosion and corrosion fatigue of aircraft components remains a critical issue for the service readiness of aging aircraft. The favorable mechanical properties of AA7075-T651 arise as a result of a heterogeneous microstructure that compromises the corrosion resistance of the alloy, ultimately resulting in localized corrosion. Understanding the factors that govern extent, rate and morphology of damage accumulation is essential in developing models to predict corrosion and corrosion fatigue resistance. The electrochemical properties of AA7075-T651 have recently been investigated on a phase-by-phase basis. As a result, quantitative microstructural characterization of AA7075-T651 takes on a critical importance in the understanding of corrosion damage accumulation, based on localized chemistry (and hence electrochemistry) of the alloy. This work presents results of a study using analytical microscopy (SEM, TEM, STEM, EDXS, EBKP) to reveal what phases, intermetallics and particles constitute AA7075-T651; allowing characterization and discrimination on a chemical basis. Knowledge of the type of localized chemistry that exists may be coupled with electrochemical results and used to typify damage accumulation processes on the nano and microscale.
AB - Corrosion and corrosion fatigue of aircraft components remains a critical issue for the service readiness of aging aircraft. The favorable mechanical properties of AA7075-T651 arise as a result of a heterogeneous microstructure that compromises the corrosion resistance of the alloy, ultimately resulting in localized corrosion. Understanding the factors that govern extent, rate and morphology of damage accumulation is essential in developing models to predict corrosion and corrosion fatigue resistance. The electrochemical properties of AA7075-T651 have recently been investigated on a phase-by-phase basis. As a result, quantitative microstructural characterization of AA7075-T651 takes on a critical importance in the understanding of corrosion damage accumulation, based on localized chemistry (and hence electrochemistry) of the alloy. This work presents results of a study using analytical microscopy (SEM, TEM, STEM, EDXS, EBKP) to reveal what phases, intermetallics and particles constitute AA7075-T651; allowing characterization and discrimination on a chemical basis. Knowledge of the type of localized chemistry that exists may be coupled with electrochemical results and used to typify damage accumulation processes on the nano and microscale.
KW - Aluminum alloys
KW - Intermetallics particles
KW - Localized corrosion
KW - Micro-electrochemistry
KW - Pitting
KW - SEM
KW - TEM
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M3 - Conference contribution
AN - SCOPUS:33845581076
SN - 0873396456
SN - 9780873396455
T3 - Materials Science and Technology
SP - 57
EP - 67
BT - Materials Science and Technology 2005 - Proceedings of the Conference
T2 - Materials Science and Technology 2005 Conference
Y2 - 25 September 2005 through 28 September 2005
ER -