title: Effect of spark plasma sintering on plasma electrolytic oxidation coatings on gas-atomized Mg-Zn-Y alloy containing nano-sized powders.
abstract: Mg-1.0wt%Zn-2.0wt%Y alloy powders were produced by gas atomization, and subsequently sintered by spark plasma sintering (SPS). The SPSed Mg-1.0wt%Zn-2.0wt%Y alloy, which showed a microstructure of well-bonded grains containing nano-sized powders of approximately 100 nm in diameter, was coated by a plasma electrolytic oxidation (PEO) method. Microstructure, mechanical properties and corrosion properties of PEO coatings were investigated and compared to those of normally sintered Mg-1.0wt%Zn-2.0wt%Y and cast Mg-1.0wt%Zn alloys. All coatings consisted of MgO and Mg2SiO4. The micro-hardness and friction coefficient of coatings on the SPSed Mg-1.0wt%Zn-2.0wt%Y alloy were higher than those on normally sintered Mg-1.0wt%Zn-2.0wt%Y and cast Mg-l.0wt%Zn alloys. However, the corrosion resistance in 3.5% NaCl solution for the SPSed Mg-1.0wt%Zn-2.0wt%Y alloy was between that for normally sintered Mg-1.0wt%Zn-2.0wt%Y alloy and cast Mg-1.0wt%Zn alloy.
authors.affiliation: Korea Aerospace University, Gyeonggi-do, 412-791, Korea.
authors.forename: Du Hyung
authors.initials: du H
authors.lastname: Lee
authors.forename: Bo Sik
authors.initials: BS
authors.lastname: Kim
authors.forename: Yo-seung
authors.initials: YS
authors.lastname: Song
authors.forename: Sung Ho
authors.initials: SH
authors.lastname: Kim
authors.forename: Chan Bok
authors.initials: CB
authors.lastname: Lee
authors.forename: Si Young
authors.initials: SY
authors.lastname: Chang