A Study on Fatigue Properties of Sc Added Al 2519 Alloy

Baek, Un Bong; Park, Jong Seo; Chung, In Hyun; Nahm, Seung Hoon; Hwa, Young; Lee, Yong Yun

doi:10.4028/www.scientific.net/kem.297-300.2483

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“…In terms of fatigue behavior, a substantial amount of investigations have been dedicated to aluminum-copper alloys (2xxx series) in recent years, mostly because of their wide use in the aircraft industry [3,27,28,31,[40][41][42][43][44][45]. In this scientific literature, there are also investigations concerned with AA2519 and AA2219, which is the precursor of AA2519 [31,43,46]. Mohamed et al revealed that low cycle fatigue behavior of AA2024 is influenced by the size of grains-the alloy with the grain size of 90 µm exhibited lower saturation stress and longer plateau in cyclic stress strain curve than alloy with the grain size of 150 µm [44].…”

Section: Introductionmentioning

confidence: 99%

“…Owolabi et al reported that the fracture surface of AA2519-T8 depicted higher resistance to fatigue cracks nucleation and propagation compared to AA2219-T8, and the failure mechanism of AA2519 has dual character (brittle and ductile) with predominance of ductile fracture [43]. Baek et al discovered that addition of 0.1% Sc to AA2519 results in higher resistance against fatigue crack nucleation due to presence of Al 3 (Sc,Zr) precipitates and fine subgrain structure [46]. Nowadays, the fatigue properties of Sc-modified 2xxx alloys are still a gap in the current state of the art, but undoubtedly, this gap will be gradually filled together with further development of light alloys in the years to come.…”

Section: Introductionmentioning

confidence: 99%

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Low Cycle Fatigue Properties of Sc-Modified AA2519-T62 Extrusion

et al. 2020

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This investigation presents the results of research on low cycle fatigue properties of Sc-modified AA2519-T62 extrusion. The basic mechanical properties of the investigated alloy have been established in the tensile test. The low cycle fatigue testing has been performed on five different levels of total strain amplitude: 0.4%; 0.5%; 0.6%; 0.7% and 0.8% with cycle asymmetry coefficient R = 0.1. For each level of total strain amplitude, the graphs of variations in stress amplitude and plastic strain amplitude in the number of cycles have been presented. The obtained results allowed to establish Ramberg-Osgood and Manson-Coffin-Basquin relationships. The established values of the cyclic strength coefficient and cyclic strain hardening exponent equal to k’ = 1518.1 MPa and n’ = 0.1702. Based on the Manscon-Coffin-Basquin equation, the values of the following parameters have been established: the fatigue strength coefficient σ’f = 1489.8 MPa, the fatigue strength exponent b = −0.157, the fatigue ductility coefficient ε’f = 0.4931 and the fatigue ductility exponent c = −1.01. The fatigue surfaces of samples tested on 0.4%, 0.6% and 0.8% of total strain amplitude have been subjected to scanning electron microscopy observations. The scanning electron microscopy observations of the fatigue surfaces revealed the presence of cracks in striations in the surrounding area with a high concentration of precipitates. It has been observed that larger Al2Cu precipitates exhibit a higher tendency to fracture than smaller precipitates having a higher concentration of scandium and zirconium.

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