Fatigue behavior of AW7075 aluminum alloy in ultra-high cycle fatigue region

0523973 - ÚFM 2021 RIV CH eng J - Journal Article
Fintová, Stanislava - Kuběna, Ivo - Trško, L. - Horník, Vít - Kunz, Ludvík
Fatigue behavior of AW7075 aluminum alloy in ultra-high cycle fatigue region.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 774, FEB (2020), č. článku 138922. ISSN 0921-5093. E-ISSN 1873-4936
R&D Projects: GA MŠMT(CZ) EF16_013/0001823
Institutional support: RVO:68081723
Keywords : precipitate-free zones * anodic-oxidation * mechanisms * performance * damage * life * Fatigue * Ultra-high cycle fatigue * Fatigue crack initiation * Fatigue damage * aw7075
OECD category: Materials engineering
Impact factor: 5.234, year: 2020
Method of publishing: Limited access
https://doi.org/10.1016/j.msea.2020.138922

Advanced electron microscopy methods were used with the aim to explain the differences in the response of strengthened AW 7075 T6511 aluminum alloy to fatigue loading at 5 Hz and 20 kHz. The shift of the S-N curve to higher number of cycles to fracture for the specimens tested at high frequency was experimentally determined. This effect is not connected with a change of the fatigue crack initiation mechanism and site from the surface to material interior. The absence of slip markings and cracking of primary intermetallic particles on the surface of cycled specimens were characteristic features. A difference in the dislocation density and dislocation arrangement in the vicinity of the fatigue crack initiation sites was shown to be the only observable effect. However, consistent with the strengthened structure of the alloy, no specific dislocation structure due to the cyclic loading was observed, regardless of the loading frequency and stress amplitude.
Permanent Link: http://hdl.handle.net/11104/0308284