Titanium-based metallic glasses for biomedical use

(Titanbasierte metallische Gläser für biomedizinische Anwendungen)

Metallic glasses are known to combine high strength and hardness with comparatively low Young‘s modulus values. This has raised the interest to evaluate in particular Ti-based glasses as possible biomaterials. However, alloy design demands a compromise between the achievement of high glass-forming ability and the use of non-toxic constituents. Alloys of the Ti-Zr-Si(-Nb) system can be rapidly quenched to glassy or glass-matrix (nanocomposite) states. Mechanical testing predicts high wear resistance. Corrosion tests in Ringer‘s solution revealed very low corrosion rates similar to those of beta-type Ti-Nb and stable anodic passivity. Nb addition improves the glass-forming ability and the mechanical properties and also supports a high pitting resistance even at extreme polarization. Thermal treatments are possible in a defined temperature-time window to preserve alloy’s microstructure and yield oxide films with characteristic morphologies The apatite-forming ability was proven. These properties recommend these new alloys for application as wear- and corrosion-resistant coating materials in the biomedical field.

S. Abdi et al., Corrosion behavior and apatite-forming ability of glassy Ti75-xZr10NbxSi15 (x=0,15) alloys – potential materials for implant applications,
J. Biomed. Mater. Res. Part B 104 (2016) 27.

S. Abdi et al., Effect of Nb adition on microstructure evolution and nanomechanical properties of a glass-forming Ti-Zr-Si alloy,
Intermetallics 46 (2014) 156.

M. Calin at al., Designing biocompatible Ti-based metallic glasses for implant applications,
Mater. Sci. Eng. C 33 (2013) 875.