Correlation of wear behaviour and microstructural evolution in Mg–Zn–Y alloys with long-period stacking ordered phase

The wear properties of extruded Mg–Zn–Y alloys containing a long-period stacking ordered (LPSO) phase were investigated during lubricated pin-on-disc (POD) type tests. The Mg96Zn2Y2 alloy with uneven LPSO-phase layers and α-Mg grains, including fine plate-like LPSO phase, exhibited smaller wear mass...

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Veröffentlicht in:Wear 2021-10, Vol.482-483, p.203983, Article 203983
Hauptverfasser: Takagi, Kosuke, Hashamova, Emilia, Dienwiebel, Martin, Mine, Yoji, Takashima, Kazuki
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Sprache:eng
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Zusammenfassung:The wear properties of extruded Mg–Zn–Y alloys containing a long-period stacking ordered (LPSO) phase were investigated during lubricated pin-on-disc (POD) type tests. The Mg96Zn2Y2 alloy with uneven LPSO-phase layers and α-Mg grains, including fine plate-like LPSO phase, exhibited smaller wear mass loss compared to that of the Mg97Zn1Y2 alloy without the fine plate-like LPSO phase. Transmission electron microscopy at the worn subsurface layer revealed that the dynamic crystallisation of the α-Mg grains increased the wear mass loss. The presence of a fine plate-like LPSO phase inside the α-Mg delayed the dynamic crystallisation of α-Mg grains under the lower normal load while it reduced the thickness of the dynamically crystallised layer after sliding deformation under the higher normal load in the Mg96Zn2Y2 alloy. •We studied wear properties of Mg–Zn–Y alloys using a pin-on-disc type tribometer.•The wear mass loss was significantly smaller in Mg96Zn2Y2 than Mg97Zn1Y2 alloy.•Strain localisation due to dynamic crystallisation of α-Mg dominated the wear resistance.•Fine plate-like LPSO phase in α-Mg suppressed the dynamic crystallisation.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2021.203983