Amorphization of nano-Mg layers in LPSO-containing magnesium alloy during cyclic deformation
SCRIPTA MATERIALIA(2024)
Abstract
Microstructural evolution during fatigue is of significance for understanding the fatigue cracking of metallic alloys. Here, we visualized amorphization near the fatigue facets for an Mg -Gd -Y -Zn -Zr alloy with long-period stacking ordered (LPSO) phase upon very high cycle fatigue (VHCF). The small amorphous patches occurred in the relatively soft nano-Mg layers, compared to the hard LPSO phase, and the amorphous band propagated along with the basal plane near the LPSO/Mg interface. This should be intimately related to the local dislocation accumulation and cumulative damage upon the cycle loading-unloading.
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Key words
Mg-Gd-Y-Zn-Zr alloy,Long-period stacking ordered (LPSO) phase,Amorphization,Very-high-cycle fatigue (VHCF)
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