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

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    0523973 - ÚFM 2021 RIV CH eng J - Článek v odborném periodiku
    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. Roč. 774, FEB (2020), č. článku 138922. ISSN 0921-5093
    Grant CEP: GA MŠk(CZ) EF16_013/0001823
    Institucionální podpora: RVO:68081723
    Klíčová slova: precipitate-free zones * anodic-oxidation * mechanisms * performance * damage * life * Fatigue * Ultra-high cycle fatigue * Fatigue crack initiation * Fatigue damage * aw7075
    Kód oboru RIV: JG - Hutnictví, kovové materiály
    Obor OECD: Materials engineering
    Impakt faktor: 4.652, rok: 2019

    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.
    Trvalý link: http://hdl.handle.net/11104/0308284
Počet záznamů: 1