title: Influence of biocorrosion on microstructure and mechanical properties of deformed Mg-Y-Er-Zn biomaterial containing 18R-LPSO phase.
abstract: The microstructure and mechanical properties of as-extruded Mg-8Y-1Er-2Zn (wt%) alloy containing long period stacking ordered (LPSO) phase are comparatively investigated before and after corrosion in a simulated body fluid (SBF) at 37°C. The as-extruded alloy consists of a long strip-like 18R-LPSO phase and some fine lamellae grains formed by primary recrystallization during the extrusion process. The hydrogen evolution volume per day fluctuates between 0.21 and 0.32ml/cm(2) in the immersion test for 240h, and the corresponding corrosion rate is calculated as 0.568mm/y. The corrosion product is determined as Mg(OH)2, whilst a Ca(H2PO4)2 compound is also observed on the surface of the samples. The corrosion site preferentially occurs at the interface between LPSO phase and Mg matrix. Before immersing, the tensile yield strength (TYS), ultimate tensile strength (UTS) and elongation of the alloy are 275MPa, 359MPa, and 19%, respectively. More attractively, these mechanical properties can be maintained even after immersing in SBF for 240h (TYS, UTS and elongation are 216MPa, 286MPa and 6.8%, respectively) because of the existence of high anti-corrosion LPSO phase.
authors.affiliation: Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China.
authors.forename: Zhe
authors.initials: Z
authors.lastname: Leng
authors.forename: Jinghuai
authors.initials: J
authors.lastname: Zhang
authors.forename: Tingting
authors.initials: T
authors.lastname: Yin
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Xuying
authors.initials: X
authors.lastname: Guo
authors.forename: Qiuming
authors.initials: Q
authors.lastname: Peng
authors.forename: Milin
authors.initials: M
authors.lastname: Zhang
authors.forename: Ruizhi
authors.initials: R
authors.lastname: Wu
mesh_terms: D000497:Alloys / Q000737:chemistry* / Q000378:metabolism*; D001672:Biocompatible Materials / Q000737:chemistry* / Q000378:metabolism*; D001826:Body Fluids / Q000378:metabolism; D003343:Corrosion; D004871:Erbium / Q000737:chemistry; D007101:Immersion; D008274:Magnesium / Q000737:chemistry; D008422:Materials Testing; D055595:Mechanical Phenomena; D015019:Yttrium / Q000737:chemistry; D015032:Zinc / Q000737:chemistry
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D015019:Yttrium; D004871:Erbium; D008274:Magnesium; D015032:Zinc
keywords: Biocorrosion; Long period stacking ordered phase; Mechanical properties; Mg alloys