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Amorphization of nano-Mg layers in LPSO-containing magnesium alloy during cyclic deformation

X. H. Shao, C. He, H. Q. Liu, N. Su, Y. J. Wu, Q. Chen, X. L. Ma

SCRIPTA MATERIALIA(2024)

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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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