Abstract
Mg97Zn1Y2 (at %) alloy with a long period stacking ordered (LPSO) phase has attracted a great deal of attention due to its excellent mechanical properties. It has been reported that this alloy could be fabricated by warm extrusion of rapid solidified alloy powders. In this study, an alternative route combining mechanical milling and equal channel angular pressing (ECAP) was selected to produce the bulk Mg97Zn1Y2 alloy. Microstructural characterization, mechanical properties and corrosion behavior of the ECAP-compacted alloys were studied. The as-cast alloy contained α-Mg and LPSO-Mg12Zn1Y1 phase. In the as-milled powder, the LPSO phase decomposed and formed Mg24Y5 phase. The ECAP-compacted alloy had identical phases to those of the as-milled sample. The compacted alloy exhibited a hardness of 120 HV and a compressive yield strength of 308 MPa, which were higher than those of the as-cast counterpart. The compacted alloy had better corrosion resistance, which was attributed to the reduced volume fraction of the secondary phase resulting in lower microgalvanic corrosion in the compacted alloy. The increase in Y content in the α-Mg matrix also contributed to the improvement of corrosion resistance.
Highlights
In the recent years, developments of magnesium alloys have increased dramatically due to the demands for light-weight structural materials with high specific strength to weight ratio and recyclability in automotive and aerospace industries [1,2,3,4]
The compacted alloy exhibited a hardness of 120 HV and a compressive yield strength of 308 MPa, which were higher than those of the as-cast counterpart
The increase in Y content in the α-Mg matrix contributed to the improvement of corrosion resistance
Summary
Developments of magnesium alloys have increased dramatically due to the demands for light-weight structural materials with high specific strength to weight ratio and recyclability in automotive and aerospace industries [1,2,3,4]. The conventional AZ (Mg-Al-Zn), AM (Mg-Al-Mn) and ZK (Mg-Zn-Zr) series Mg alloys will not satisfy the extended industrial application for load-bearing components [5]. Among the newly developed Mg alloys, WZ (Mg-Zn-Y) series Mg alloy containing a long period stacking ordered (LPSO) structure has attracted much attention due to its excellent mechanical properties. The bulk alloy prepared by rapidly solidified powder metallurgy (RS/PM) method exhibited an ultra-high tensile strength of 610 MPa and modest elongation of 5%. The high strength was attributed to the fine Mg matrix with a grain size of 100–200 nm and the presence of the LPSO phase
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