The Effect of Pitting on Fatigue Lives of Peak-Aged and Overaged 7075 Aluminum Alloys |
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| Authors: | S Dey S K Das A Basumallick I Chattoraj |
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| Affiliation: | (1) National Metallurgical Laboratory (CSIR), Jamshedpur, 831007, India;(2) Department of Metallurgy and Materials Engineering, Bengal Engineering & Science University, Shibpur, Howrah, 711103, India; |
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| Abstract: | Fatigue lives at high peak stresses for peak-aged (T6) and overaged (T73) 7075 aluminum alloy were compared in the uncorroded
and precorroded (pitted) states. Absolute fatigue lives of T73 samples were much higher than that of T6 in the virgin as well
as precorroded condition, but the normalized life of T73 was less than that of T6, indicating an intrinsic crack initiation
resistance in the former, borne out by fractography, which showed that fatigue cracks almost always initiated at pits for
T73 but not for T6. The various crack initiation methodologies observed and the effect of pitting on fatigue lives in the
two aging conditions are discussed. |
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