Ti-based bulk metallic glasses (BMGs) are potential biomedical materials due to their high corrosion resistance, excellent mechanical properties and good bioactivity. In this chapter, we report the fabrication and corrosion behavior of Ni-free TiZrCuPdSn BMGs prepared by copper mold casting method and spark plasma sintering (SPS) process. The thermal stability, microstructure, mechanical properoties and corrosion behavior of Ti-based BMGs have been investigated, respectively. The results reveal that minor addition of Sn increases the thermal stabilit and glass forming ability of as-cast Tibased BMGs. As-cast Ti-based BMGs are spontaneously passivated in Hanks' solution, and the increasing of Zr content in the alloy systmen improves the corrosion resistance due to the enrichment of Ti and Zr in the passive layer. TiZrCuPdSn nanocrystalline/glassy alloys with small nanoparticles prepared by melt-spinning also exhibit high corrosion resistance due to the uniform corrosion, while the alloy with larger size nanoparticles shows lower corrosion resistance. The effects of sintering temperature on densification, structure, mechanical properties and corrosion behavior of the SPS sintered Ti-based BMG samples were also investigated. The high strength of the sintered BMG samples with high densification and without crystallization, as that of as-cast BMG samples, was obtained at a sintering temperature of 643K. The anodic current density of the SPS sintered BMG samples is not as stable as that as-cast bulk or as-spun ribbons due to the crevice corrosion in Hanks' solution.
|Title of host publication||Titanium Alloys|
|Subtitle of host publication||Formation, Characteristics and Industrial Applications|
|Publisher||Nova Science Publishers, Inc.|
|Number of pages||26|
|Publication status||Published - 2013 Dec 1|
ASJC Scopus subject areas