Application of Eddy Currents in Processed Materials Structural Evaluation

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


Eddy currents are based on electromagnetic induction and analysis of electrical currents on conductive materials. This method is used for thickness measurements, corrosion and defects detection, electrical conductivity and magnetic permeability measurements. Recently, it has been exploited as a materials characterization technique, namely in solid state welding, since, compared to hardness, it is based in distinct physical phenomena. Electrical conductivity is controlled by electronic mobility, while hardness depends on crystal defects and thus a scale factor exists. This paper presents results of this characterization technique applied to multipass solid state friction stir processing (FSP) of AA1100 alloy. These results were compared to microstructural analysis and hardness measurements and show that eddy current is a feasibly, reliable and expedite technique to characterize processed materials. The electrical conductivity measured by eddy currents, maps more precisely structural features, while hardness does not. Measurement of electrical conductivity field suggests having potential to constitute an alternative and/or complement to hardness evaluation with the further advantage of being a non-destructive method.
Original languageEnglish
Title of host publicationAdvanced Materials Forum VI
EditorsA. M. P. Pinto, A. S. Pouzada
PublisherTrans Tech Publications Ltd
Publication statusPublished - 2013
Event6th International Materials Symposium, Materiais 2011 - Guimaraes, Portugal
Duration: 18 Apr 201120 Apr 2011

Publication series

NameMaterials Science Forum
PublisherTrans Tech Publications Ltd
ISSN (Print)0255-5476


Conference6th International Materials Symposium, Materiais 2011


  • Aluminium alloys
  • Eddy currents
  • Electrical conductivity
  • Friction stir processing


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