The fatigue crack behavior of 7N01-T6 aluminum alloy in different particle environments
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(2020) 20:129
ORIGINAL ARTICLE
The fatigue crack behavior of 7N01‑T6 aluminum alloy in different particle environments Y. Q. Chen1 · Z. H. Tang1 · S. P. Pan2 · W. H. Liu1 · Y. F. Song1 · B. W. Zhu1 · Y. Liu1 · Z. L. Wen3 Received: 12 December 2019 / Revised: 7 September 2020 / Accepted: 26 September 2020 © Wroclaw University of Science and Technology 2020
Abstract An experimental method of evaluating the fatigue behavior of alloys in different particle environments was designed, and the effects of four kinds of particles (i.e., graphite, CaO, Al2O3, and MnO2) on the crack propagating behavior of 7N01-T6 behaviour alloys were investigated. The results show that the particles deposited on the crack surface exert significant influence on the fatigue crack propagation behavior thereof. This influence strongly depends on the elastic moduli of the particles (Ep). As Ep is less than that of aluminium alloy (EAl), the particle accelerates the fatigue-crack-growth rate (FCGR) in the alloys due to the lubrication of the particles on the mating fracture surfaces. When the difference between Ep and EAl is small, the particle effect on the FCGRs of the alloys is small due to the counteraction between the decrease in friction and the promotion on the crack closure of mating fracture surfaces. When Ep is greater than EAl, the particles slow down the FCGRs of the alloys on account of significant crack closure effect. As Ep is much greater than EAl, the particles increase the FCGRs because of the increasing stress concentration at the crack tip. Keywords Aluminium alloys · Fatigue crack growth · Particles · Crack closure · Microstructure List of symbols E Elastic modulus Ep The elastic moduli of particles EAl The elastic moduli of aluminium alloy Egra The elastic moduli of graphite particles ECaO The elastic moduli of CaO particles EAl2 O3 The elastic moduli of Al2O3 particles EMnO2 The elastic moduli of MnO2 particles EFe3 O4 The elastic moduli of Fe3O4 particles FCGR Fatigue-crack-growth rate OICC Oxide-induced crack closure RICC Roughness-induced crack closures * Y. Q. Chen [email protected] * W. H. Liu [email protected] 1
Hunan Provincial Key Laboratory of New Energy Storage and Conversion of Advanced Materials, Hunan University of Science and Technology, Xiangtan 411201, People’s Republic of China
2
Advanced Research Center, Central South University, Changsha 410083, People’s Republic of China
3
School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, People’s Republic of China
SEM Scanning electron microscope EDS Energy-dispersive spectroscopy COD Crack-tip opening displacement CODmax Maximum crack-tip opening displacement CODmin Minimum crack-tip opening displacement a The crack size B The thickness of specimen W The width of specimen P The applied force V Displacement between measurement points R Stress ratio K The stress intensity factor Kmax The maximum K value at crack tip during each loading cycle Kmin The minimum K value at crack tip during
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