TY - JOUR
T1 - A Ni- and Cu-free Zr-based bulk metallic glass with excellent resistance to stress corrosion cracking in simulated body fluids
AU - Kawashima, Asahi
AU - Wada, Takeshi
AU - Ohmura, Kazuyo
AU - Xie, Guoqiang
AU - Inoue, Akihisa
PY - 2012/4/30
Y1 - 2012/4/30
N2 - In order to evaluate stress corrosion cracking (SCC) susceptibility of a Ni- and Cu-free Zr 56Al 16Co 28 bulk metallic glass (BMG) for biomedical application, the SCC behaviour of the BMG in various simulated body fluids (SBFs) including Hanks', PBS(-) and 0.9% NaCl solutions open to air at 37°C has been investigated using a slow strain rate technique (SSRT) at various initial tensile strain rates in the region of 5×10 -7 to 5×10 -4s -1. It was found that the Zr-Al-Co BMG exhibited excellent resistance to SCC in all of tested conditions. The amounts of cytotoxic cobalt ions released from the BMG disks of 5mm in diameter were lower than those from the currently used biomaterial Co-Cr-Mo alloy. XPS analysis revealed that zirconium and aluminium ions were enriched in both air-formed and passive films. Moreover, these films were composed of double oxyhydroxide of zirconium, aluminium and cobalt. The formation of the stable and homogeneous double oxyhydroxide film enriched with zirconium and aluminium cations seems to be responsible for the high corrosion resistance and hence good SCC resistance of the Zr-Al-Co glassy alloy in SBFs. Thus, the Zr 56Al 16Co 28 BMG can be potentially promising material for biomedical applications.
AB - In order to evaluate stress corrosion cracking (SCC) susceptibility of a Ni- and Cu-free Zr 56Al 16Co 28 bulk metallic glass (BMG) for biomedical application, the SCC behaviour of the BMG in various simulated body fluids (SBFs) including Hanks', PBS(-) and 0.9% NaCl solutions open to air at 37°C has been investigated using a slow strain rate technique (SSRT) at various initial tensile strain rates in the region of 5×10 -7 to 5×10 -4s -1. It was found that the Zr-Al-Co BMG exhibited excellent resistance to SCC in all of tested conditions. The amounts of cytotoxic cobalt ions released from the BMG disks of 5mm in diameter were lower than those from the currently used biomaterial Co-Cr-Mo alloy. XPS analysis revealed that zirconium and aluminium ions were enriched in both air-formed and passive films. Moreover, these films were composed of double oxyhydroxide of zirconium, aluminium and cobalt. The formation of the stable and homogeneous double oxyhydroxide film enriched with zirconium and aluminium cations seems to be responsible for the high corrosion resistance and hence good SCC resistance of the Zr-Al-Co glassy alloy in SBFs. Thus, the Zr 56Al 16Co 28 BMG can be potentially promising material for biomedical applications.
KW - Bulk metallic glass
KW - Simulated body fluid
KW - Stress corrosion cracking
KW - X-ray photoelectron spectroscopy
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U2 - 10.1016/j.msea.2012.02.047
DO - 10.1016/j.msea.2012.02.047
M3 - Article
AN - SCOPUS:84858443825
VL - 542
SP - 140
EP - 146
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -