Understanding damage accumulation upon AA7075-T651 used in airframes from a microstructural point of view

N. Birbilis, M. K. Cavanaugh, R. G. Buchheit, D. G. Harlow, R. P. Wei

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationMaterials Science and Technology 2005 - Proceedings of the Conference
Pages57-67
Number of pages11
Volume1
Publication statusPublished - 1 Dec 2005
Externally publishedYes
EventMaterials Science and Technology 2005 Conference - Pittsburgh, PA, United States of America
Duration: 25 Sep 200528 Sep 2005

Conference

ConferenceMaterials Science and Technology 2005 Conference
CountryUnited States of America
CityPittsburgh, PA
Period25/09/0528/09/05

Keywords

  • Aluminum alloys
  • Intermetallics particles
  • Localized corrosion
  • Micro-electrochemistry
  • Pitting
  • SEM
  • TEM

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