title: Mechanical properties and corrosion behavior of Mg-Gd-Ca-Zr alloys for medical applications.
abstract: Magnesium alloys are promising candidates for biomedical applications. In this work, influences of composition and heat treatment on the microstructure, the mechanical properties and the corrosion behavior of Mg-Gd-Ca-Zr alloys as potential biomedical implant candidates were investigated. Mg5Gd phase was observed at the grain boundaries of Mg-10Gd-xCa-0.5Zr (x=0, 0.3, 1.2wt%) alloys. Increase in the Ca content led to the formation of additional Mg2Ca phase. The Ca additions increased both the compressive and the tensile yield strengths, but reduced the ductility and the corrosion resistance in cell culture medium. After solution heat treatment, the Mg5Gd particles dissolved in the Mg matrix. The compressive strength decreased, while the corrosion resistance improved in the solution treated alloys. After ageing at 200°C, metastable β' phase formed on prismatic planes and a new type of basal precipitates have been observed, which improved the compressive and tensile ultimate strength, but decreased the ductility.
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China. Electronic address: llshi@imr.ac.cn.
authors.forename: Ling-Ling
authors.initials: LL
authors.lastname: Shi
authors.affiliation: Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany.
authors.forename: Yuanding
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany.
authors.forename: Lei
authors.initials: L
authors.lastname: Yang
authors.affiliation: Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Feyerabend
authors.affiliation: Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany.
authors.forename: Chamini
authors.initials: C
authors.lastname: Mendis
authors.affiliation: Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany.
authors.forename: Regine
authors.initials: R
authors.lastname: Willumeit
authors.affiliation: Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany.
authors.forename: Karl
authors.initials: K
authors.lastname: Ulrich Kainer
authors.affiliation: Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany.
authors.forename: Norbert
authors.initials: N
authors.lastname: Hort
mesh_terms: D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry; D003343:Corrosion; D005682:Gadolinium / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry; D008422:Materials Testing; D055595:Mechanical Phenomena; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D005682:Gadolinium; D015040:Zirconium; D008274:Magnesium; D002118:Calcium
keywords: Biomedical Applications; Corrosion behavior; Gadolinium; Magnesium; Mechanical properties