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Biodegradable behaviour and fatigue life of ZEK100 magnesium alloy in simulated physiological environment
Author(s) -
Zhao J.,
Gao L.L.,
Gao H.,
Yuan X.,
Chen X.
Publication year - 2015
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.12262
Subject(s) - materials science , corrosion , magnesium , immersion (mathematics) , ultimate tensile strength , magnesium alloy , alloy , metallurgy , microstructure , corrosion fatigue , fatigue limit , elastic modulus , pitting corrosion , cyclic stress , composite material , mathematics , pure mathematics
The fatigue life of ZEK100 magnesium alloy in the phosphate buffered solution for various immersion intervals was investigated by experiments and theoretical predictions. The biodegradable behaviours of ZEK100 magnesium alloy were also studied. Microstructure observation showed that the corrosion behaviours were characterized by pitting corrosion. The corrosion rate decreased a lot in the initial 7 d and then almost stayed unchanged. After 28 d immersion, the elastic modulus almost kept stable, while the yield strength and the ultimate strength decreased a lot, which indicated that corrosion had important effects on the tensile mechanical properties. It showed that the fatigue life of the samples under the same stress conditions decreased with increasing immersion time under the asymmetric stress‐controlled cyclic loading. Considering the effect of corrosion on the material failure, a modified fatigue life model was proposed for magnesium alloy under corrosion.