Effect of Ductile Thermal Spray Coatings on Fatigue Performance of 7075-T651 Aluminum Alloy

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TypeArticle
Journal titleCanadian Metallurgical Quarterly
Volume44
Issue4
Pages495504; # of pages: 9
AbstractThe fatigue behaviour of 7075-T651 Al alloy with ductile aluminum thermal sprayed coatings deposited by four different commercial arc spray devices (guns) has been characterized. Coated specimens as well as polished and shot peened specimens were evaluated under fully reversed uniaxial loading at a constant amplitude of ±225 MPa. While the shot peening pretreatment was observed to increase the fatigue resistance of polished specimens, application of the coatings subsequently reduced fatigue life to below that of the original polished coupons. Changes in the residual stress state of the shot peened surface were identified as the most likely source of these reductions, even though no microstructural changes in the substrate were perceptible. Variations in fatigue life were also observed between the coatings resulting from the four spray guns. The roles of surface roughness and coating delamination in producing these decreases were investigated and stress concentrations resulting from coating delamination were identified as the primary detrimental factor affecting fatigue resistance.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number47615
NPARC number15955053
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Record identifier7b1b97f7-5d25-43cc-8114-4dd852c4dce4
Record created2010-08-17
Record modified2016-05-09
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