AbstractMg based thin films are of increasing interest due to the potential in varying the corrosion properties in comparison to bulk alloys of the same nominal composition.
In this work the mechanical behaviour and the corrosion performance of sputtered thin films
consisting of magnesium alloys with the compositions Mg4Y3Gd and Mg4Y3Nd were investigated
by tensile tests and electrochemical corrosion tests, respectively.
The tensile tests showed that the sputtering parameters have an enormous influence on the
mechanical properties of the thin films. By variation of the Ar sputtering pressure and the DC
sputtering power it was possible to fabricate films with widely varying mechanical behaviour
reaching from brittle to very ductile films which could be strained to more than 30%. The
determined dependency between mechanical properties and deposition conditions was found to be
present in both investigated alloys. The corrosion tests revealed that the corrosion behaviour of the
investigated samples is not correlated to the mechanical properties of the thin films, as the rate of
corrosion and the tendency to localized corrosion do not change significantly upon the deposition
conditions, which dramatically influence the mechanical properties.