Open AccessEffects of ageing on low-cycle fatigue (LCF) properties of AZ80 magnesium alloy wheel hub
Author(s) -
Jun Wang,
Fulai Yang,
Jin Ma,
TingYan Zhang,
Hui Cao,
Xin Che,
Liye Geng,
Zhimin Zhang,
Qiang Wang,
Yongbiao Yang
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abb0ae
Subject(s) - materials science , ageing , softening , metallurgy , magnesium alloy , alloy , microstructure , hardening (computing) , precipitation hardening , composite material , layer (electronics) , genetics , biology
A hollow billet Expanding-Reducing Extrusion (ERE) wheel hub forming process was carried out with AZ80 magnesium alloy. The effects of ageing on Low-cycle fatigue (LCF) properties were investigated, and the microstructure was characterized with scanning electronic microscopy (SEM). The LCF testing results exhibited that the stress amplitude increased with increasing ageing time, while the plastic strain decreased with increasing ageing time. Cyclic softening followed by hardening was observed for 0 h and 16 h aged samples; however, there was no obvious cyclic softening or hardening for 36 h aged sample. The tension-compression asymmetry were not obvious due to the low strain, precipitation and the non typical basal texture. Fracture observations indicated that the fatigue cracks were initiated on the surface, and the crack propagation area decreased with increasing ageing time. Thus, it can be concluded that ageing has strong effects on the fatigue life for the studied magnesium alloy.
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