Microstructure and Corrosion Resistance of Ti–Zr–Cu–Pd–Sn Glassy and Nanocrystalline Alloys

Abstract

The microstructure and corrosion behavior of the Ti 47:5 Zr 15 Cu 30 Pd 7:5 Sn 5 as-spun ribbons and as-cast rod have been investigated using HREM and potentiodynamic polarization study in simulated body fluids. The results of HREM reveal that, with decreasing cooling rate, the size and volume of nano-particles dispersed in glassy matrix increase for the Ti 47:5 Zr 15 Cu 30 Pd 7:5 Sn 5 as-prepared samples. The as-spun ribbons with small size nano-particle show high corrosion resistance in PBS(À) and Hanks' solution, may be due to the formation of CuZr phase, resulting in the enrichment of Ti and Pd in the glassy matrix, which is helpful to form protective passive film. Comparatively, poor corrosion resistance is observed for the as-cast rod sample with larger nano-particles in both solutions.

Palladium‐Based Metallic Glass with High Thrombogenic Resistance for Blood‐Contacting Medical Devices

“…As to the BMGs, we chose Ti 40 Zr 10 Cu 32 Pd 14 Sn 4 [41] and Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 , [42] because both base elements, Ti and Zr, and their alloys are wellaccepted biometals, with a report edly high corrosion resistance in physiological liquids exceeding that of Ti64. [43,44] Moreover, these compositions are known to have a fairly high glassforming ability, concomitant with a high critical casting thickness D c of 10 [41] and 16 mm, [42] respectively, and can thus be prepared in bulk form. As to the mechanical properties, the reader is referred to Table S1, Supporting Infor mation, where we provide, in comparison to crystalline Ti64, an overview of the mechanical properties characteristic for the bulk metallic glasses investigated in this study.…”

Enhanced Mechanical Properties, Corrosion Behavior and Bioactivity of Ti-based Bulk Metallic Glasses with Minor Addition Elements

“…Ti-based BMGs are expected as one of the most important metallic materials in orthopedics and dental surgery due to their low Young's modulus, high fracture strength, excellent strength-to-weight ratio, good corrosion resistance and superior biocompatibility of titanium [1][2][3][4]. Recently, the developments of Ni-free Ti-Zr-Cu-Pd and Ti-Zr-Cu-Pd-Sn BMGs with high glassforming ability (GFA) make it possible to create newgeneration metallic biomedical materials with acceptable properties [5][6][7][8][9][10]. Usually, BMG materials catastrophically fracture once the main shear band initiates and propagates without any obstacle.…”

Designing new biocompatible glass‐forming Ti75‐xZr10NbxSi15 (x = 0, 15) alloys: corrosion, passivity, and apatite formation

“…Similar investigations have been done by Qin et al for glass-forming Ti-Zr-Cu-Pd-Sn alloys and by Oak et al for Ti-Zr-Ta-Si alloys in body simulated fluids at 37 C. They conducted quasistatic polarization measurements up to 1.5 V versus SCE. 9,10,42,43 For Cu-containing alloys certain passivity break downs and pitting events occur at defined potentials less than 1.5 V versus SCE, but Ti-Zr-Ta-Si alloy systems demonstrate a similar stable behavior as that of our alloys up to 1.5 V versus SCE. In comparison, in the present study we proved for melt-spun Ti 75 Zr 10 Si 15 and Ti 60 Zr 10 Nb 15 Si 15 , a very high stability of the passive state in a wider anodic potential range, that is even beyond the water stability limit.…”

“…Similar investigations have been done by Qin et al for glass‐forming Ti‐Zr‐Cu‐Pd‐Sn alloys and by Oak et al for Ti‐Zr‐Ta‐Si alloys in body simulated fluids at 37°C. They conducted quasistatic polarization measurements up to 1.5 V versus SCE . For Cu‐containing alloys certain passivity break downs and pitting events occur at defined potentials less than 1.5 V versus SCE, but Ti‐Zr‐Ta‐Si alloy systems demonstrate a similar stable behavior as that of our alloys up to 1.5 V versus SCE.…”