Low cycle fatigue behavior of the extruded AZ80 magnesium alloy under different strain amplitudes and strain rates

Low cycle fatigue behavior of extruded AZ80 magnesium alloy was investigated under uniaxial tension-compression at different strain amplitudes and strain rates. The results show that the extruded AZ80 magnesium alloy exhibits cyclic hardening at strain amplitudes ranging from 0.4% to 1.0%, the asymm...

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Bibliographic Details
Published inJournal of magnesium and alloys Vol. 4; no. 3; pp. 181 - 187
Main Authors Wang, Cong, Luo, Tianjiao, Yang, Yuansheng
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2016
KeAi Communications Co., Ltd
Subjects
Extruded AZ80
Low cycle fatigue
Magnesium alloy
Strain amplitude
Strain rate
Extruded AZ80
Strain amplitude
Low cycle fatigue
Magnesium alloy
Strain rate
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Summary:Low cycle fatigue behavior of extruded AZ80 magnesium alloy was investigated under uniaxial tension-compression at different strain amplitudes and strain rates. The results show that the extruded AZ80 magnesium alloy exhibits cyclic hardening at strain amplitudes ranging from 0.4% to 1.0%, the asymmetry of hysteresis loops becomes increasingly obvious when the strain amplitude increases. Higher strain rates correspond to higher stress amplitudes, high mean stresses and short fatigue life. {10–12} extension twins play a role in the cyclic deformation under higher strain amplitudes (0.8%, 1.0%). The relationship between total strain energy density and fatigue life can be described by the modified Morrow model. The effect of strain rate on the fatigue life can also be predicted by the model.
ISSN:2213-9567
2213-9567
DOI:10.1016/j.jma.2016.07.002