Effect of grain size and crystallographic structure on the corrosion and tribocorrosion behaviour of a CoCrMo biomedical grade alloy in simulated body fluid
Effect of grain size and crystallographic structure on the corrosion and tribocorrosion behaviour of a CoCrMo biomedical grade alloy in simulated body fluid
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DOI：
10.1016/j.wear.2021.203884
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发表时间：
2021-04
期刊：
影响因子：
5
通讯作者：
R. Namus;W. M. Rainforth;Yi Huang;T. Langdon
中科院分区：
文献类型：
--
作者：
R. Namus;W. M. Rainforth;Yi Huang;T. Langdon
钴铬钼合金因其出色的长期存活率而用于髋关节和膝关节置换术。然而，最近观察到与不良组织反应相关的高失败率。CoCrMo合金表面在磨损过程中发生微观结构变化，包括ε-马氏体的形成，偶尔也会形成纳米晶表面层。目前尚不清楚这些变化对组件的性能是有利还是有害。因此，高压扭转（HPT）是用来产生不同的晶粒尺寸和晶体结构的CoCrMo合金和腐蚀和摩擦腐蚀行为进行了严格的研究作为晶粒尺寸的函数。结果表明HTP处理的样品的耐腐蚀性降低。摩擦腐蚀中的机械和腐蚀材料损失的贡献也进行了研究。
CoCrMo alloys are used in hip and knee replacements due to their excellent long-term survival rates. However, high failure rates have recently been observed associated with adverse tissue reactions. CoCrMo alloy surfaces undergo microstructural changes during wear, including the formation of ε-martensite and, occasionally, a nanocrystalline surface layer. It is not clear whether these changes are beneficial or detrimental to the performance of the component. Thus, high-pressure torsion (HPT) was employed to produce different grain sizes and crystallographic structures in a CoCrMo alloy and the corrosion and tribocorrosion behaviour were critically investigated as a function of grain size. The results reveal a degradation of the corrosion resistance for the HTP processed samples. The contributions of mechanical and corrosion material loss in tribocorrosion is also examined.