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- W2382422876 abstract "The effects of an ultrasonic deep rolling(UDR) treatment on the fatigue behavior of pre-corroded 7A52-CZ aluminum alloys were investigated.7A52 aluminum alloy specimens were corroded in exfoliation corrosion(EXCO) solution at different durations.Some corroded specimens were treated by UDR.Fatigue tests were carried out for the uncorroded,corroded and UDR treated specimens.By means of X-ray diffraction stress measurements and scanning electron microscopy(SEM),residual stress and fractograph of 7A52 aluminum alloys with and without UDR treatment were analyzed.The results indicated that UDR produced compressive residual stresses with depth approaching 1mm.UDR treatment can extend the fatigue life of the pre-corroded 7A52 specimens to a large extent,depending on the level of corrosion and UDR parameter.For the light corroded specimens,UDR treatment changed the fatigue crack nucleation site from surface to the transition zone between the compressive residual stresses and tensile stresses,resulted in a much longer fatigue life.For the severely corroded specimens,the crack still nucleated by intergranular cracking,however,due to the compressive residual stresses introduced and the closure of the corrosion pits and corrosion microcracks,UDR treatment still improved fatigue performance of the pre-corroded 7A52 aluminum alloy substantially." @default.
- W2382422876 created "2016-06-24" @default.
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- W2382422876 date "2009-01-01" @default.
- W2382422876 modified "2023-09-24" @default.
- W2382422876 title "Mechanism on Improvement of Fatigue Performance of Pre-corroded 7A52-CZ Aluminum Alloy by Ultrasonic Deep Rolling Treatment" @default.
- W2382422876 hasPublicationYear "2009" @default.
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