|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Magnesium-based Biodegradable Implants
||Influence of Precipitation Hardening in Mg-Y-Nd on Mechanical and Corrosion Properties
||Petra Maier, Raimund Peters, Chamini Mendis, Sören Müller, Norbert Hort
|On-Site Speaker (Planned)
Precipitation hardening in Mg-RE alloys is an effective strengthening mechanism to achieve high strength at moderate ductility. However, improved mechanical properties can affect corrosion by finely dispersed particles often being more noble than the matrix. Biodegradable implant material should show a certain corrosion rate, but should be free of pitting. Deep pits are notches causing higher mechanical stress concentration. WE43 has already shown an acceptable biological response. In this study a Mg-Y-Nd-Gd-Dy (WE32) alloy in extruded, solution and precipitation heat treated conditions has been investigated. Solution heat treatment causes grain growth and strength loss. A rather short ageing response is found, where peak hardening causes hardness values exceeding the initial extruded condition. Grain growth during ageing is not significant. Corrosion has been evaluated with potentiodynamic polarization in Ringer solution. The highest corrosion rate is found in the supersaturated a-phase. The peak aged alloy shows the most homogenous form of corrosion.
||Planned: A combination print-CD volume