title: Microstructure, mechanical and corrosion properties of Mg-Dy-Gd-Zr alloys for medical applications.
abstract: In previous investigations, a Mg-10Dy (wt.%) alloy with a good combination of corrosion resistance and cytocompatibility showed great potential for use as a biodegradable implant material. However, the mechanical properties of Mg-10Dy alloy are not satisfactory. In order to allow the tailoring of mechanical properties required for various medical applications, four Mg-10(Dy+Gd)-0.2Zr (wt.%) alloys were investigated with respect to microstructure, mechanical and corrosion properties. With the increase in Gd content, the number of second-phase particles increased in the as-cast alloys, and the age-hardening response increased at 200°C. The yield strength increased, while the ductility reduced, especially for peak-aged alloys with the addition of Gd. Additionally, with increasing Gd content, the corrosion rate increased in the as-cast condition owing to the galvanic effect, but all the alloys had a similar corrosion rate (~0.5 mm year(-1)) in solution-treated and aged condition.
authors.affiliation: Helmholtz Zentrum Geesthacht, Magnesium Innovation Centre, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany. Electronic address: lyang0522@gmail.com.
authors.forename: L
authors.initials: L
authors.lastname: Yang
authors.forename: Y
authors.initials: Y
authors.lastname: Huang
authors.forename: F
authors.initials: F
authors.lastname: Feyerabend
authors.forename: R
authors.initials: R
authors.lastname: Willumeit
authors.forename: C
authors.initials: C
authors.lastname: Mendis
authors.forename: K U
authors.initials: KU
authors.lastname: Kainer
authors.forename: N
authors.initials: N
authors.lastname: Hort
mesh_terms: D000497:Alloys / Q000494:pharmacology*; D001672:Biocompatible Materials / Q000494:pharmacology; D003343:Corrosion; D004602:Elements; D006244:Hardness; D008422:Materials Testing; D055595:Mechanical Phenomena / Q000187:drug effects*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D010316:Particle Size; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D004602:Elements
keywords: Corrosion properties; Mechanical properties; Mg–Dy–Gd–Zr alloys; Microstructure