title: Microstructures, mechanical properties and corrosion resistances of extruded Mg-Zn-Ca-xCe/La alloys.
abstract: Magnesium alloys are considered as good candidates for biomedical applications, the influence of Ce/La microalloying on the microstructure, mechanical property and corrosion performance of extruded Mg-5.3Zn-0.6Ca (wt%) alloy has been investigated in the current study. After Ce/La addition, the conventional Ca2Mg6Zn3 phases are gradually replaced by new Mg-Zn-Ce/La-(Ca) phases (T1'), which can effectively divide the Ca2Mg6Zn3 phase. The Ca2Mg6Zn3/T1' structure in Mg-Zn-Ca-0.5Ce/La alloy is favorably broken into small particles during the extrusion, resulting in an obvious refinement of secondary phase. The dynamic recrystallized grain size is dramatically decreased after 0.5Ce/La addition, and the tensile yield strength is improved, while further addition reverses the effect, due to the grain coarsening. However, the corrosion resistance of extruded Mg-Zn-Ca alloy deteriorates after Ce/La addition, because the diameter of secondary phase particle is remarkably decreased, which increases the amount of cathodic sites and accelerates the galvanic corrosion process.
authors.affiliation: State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: L B
authors.initials: LB
authors.lastname: Tong
authors.affiliation: State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China.
authors.forename: Q X
authors.initials: QX
authors.lastname: Zhang
authors.affiliation: Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China.
authors.forename: Z H
authors.initials: ZH
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China; Key Lab of Automobile Materials, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun 130025, China.
authors.forename: J B
authors.initials: JB
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China.
authors.forename: J
authors.initials: J
authors.lastname: Meng
authors.affiliation: State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China. Electronic address: lrcheng@ciac.ac.cn.
authors.forename: L R
authors.initials: LR
authors.lastname: Cheng
authors.affiliation: State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China. Electronic address: hongjie@ciac.ac.cn.
authors.forename: H J
authors.initials: HJ
authors.lastname: Zhang
mesh_terms: D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D002118:Calcium; D002563:Cerium; D003343:Corrosion; D007811:Lanthanum; D008274:Magnesium; D008422:Materials Testing; D015032:Zinc
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D002563:Cerium; D007811:Lanthanum; D008274:Magnesium; D015032:Zinc; D002118:Calcium
keywords: Ce/La addition; Corrosion resistance; Mechanical properties; Mg–Zn–Ca alloy; Microstructure