A Ni- and Cu-free Zr-based bulk metallic glass with excellent resistance to stress corrosion cracking in simulated body fluids
A Ni- and Cu-free Zr-based bulk metallic glass with excellent resistance to stress corrosion cracking in simulated body fluids
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DOI：
10.1016/j.msea.2012.02.047
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发表时间：
2012-04
期刊：
影响因子：
6.4
通讯作者：
A. Kawashima;T. Wada;K. Ohmura;G. Xie;A. Inoue
中科院分区：
文献类型：
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作者：
A. Kawashima;T. Wada;K. Ohmura;G. Xie;A. Inoue
为了评估用于生物医学应用的无Ni和cu的zr56al16co28大块金属玻璃（BMG）的应力腐蚀开裂（SCC）敏感性，使用慢应变率技术（SSRT）研究了BMG在各种模拟体液（sbf）中的SCC行为，包括Hanks， PBS（-）和0.9% NaCl溶液，在37°C的空气中开放，在5×10−7至5×10−4s−1范围内的不同初始拉伸应变速率。结果表明，在所有测试条件下，Zr-Al-Co BMG均表现出优异的抗SCC性能。直径5mm的BMG盘释放的细胞毒性钴离子量低于目前使用的生物材料Co-Cr-Mo合金。XPS分析表明，锆和铝离子在空气形成膜和被动膜中都富集。此外，这些薄膜是由锆、铝和钴的双氢氧化物组成的。在SBFs中，Zr-Al-Co玻璃合金具有较高的耐蚀性和良好的抗SCC性能，其形成稳定且均匀的富含锆和铝阳离子的双氧化氢氧化物膜是主要原因。因此，Zr56Al16Co28BMG具有潜在的生物医学应用前景。
In order to evaluate stress corrosion cracking (SCC) susceptibility of a Ni- and Cu-free Zr56Al16Co28bulk 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 5×10−7to 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 Zr56Al16Co28BMG can be potentially promising material for biomedical applications.