Flexible and Tough Superelastic Co-Cr Alloys for Biomedical Applications
Flexible and Tough Superelastic Co-Cr Alloys for Biomedical Applications
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DOI：
10.1002/adma.202202305
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发表时间：
2022-06-03
影响因子：
29.4
通讯作者：
Kainuma, Ryosuke
中科院分区：
文献类型：
--
作者：
Odaira, Takumi;Xu, Sheng;Kainuma, Ryosuke
随着世界范围内老年人口的增加，对生物材料的需求沿着增加。金属生物材料的机械性能和高耐磨性使其非常适合用作受损硬组织的替代品或支撑物。然而，除非这些生物材料也具有类似于人骨的低杨氏模量，否则骨萎缩不可避免地发生。因为低杨氏模量通常与差的耐磨性相关联，所以难以同时实现低杨氏模量和高耐磨性。此外，形状记忆合金的超弹性使其适用于生物医学应用，如血管支架和导丝。然而，由于传统的生物相容性形状记忆合金的低可恢复应变，对新的合金系统的需求很高。本工作中的新型体心立方钴铬基合金为这两个问题提供了解决方案。取向单晶钴铬基合金的杨氏模量为10-30 GPa，这与人骨的杨氏模量相似，并且它们还表现出高的耐磨性和耐腐蚀性。它们还表现出超弹性，具有高达17.0%的巨大可恢复应变。由于这些原因，新型钴铬基合金可能是生物医学应用的有前途的候选者。
The demand for biomaterials has been increasing along with the increase in the population of elderly people worldwide. The mechanical properties and high wear resistance of metallic biomaterials make them well-suited for use as substitutes or as support for damaged hard tissues. However, unless these biomaterials also have a low Young's modulus similar to that of human bones, bone atrophy inevitably occurs. Because a low Young's modulus is typically associated with poor wear resistance, it is difficult to realize a low Young's modulus and high wear resistance simultaneously. Also, the superelastic property of shape-memory alloys makes them suitable for biomedical applications, like vascular stents and guide wires. However, due to the low recoverable strain of conventional biocompatible shape-memory alloys, the demand for a new alloy system is high. The novel body-centered-cubic cobalt-chromium-based alloys in this work provide a solution to both of these problems. The Young's modulus of -oriented single-crystal cobalt-chromium-based alloys is 10-30 GPa, which is similar to that of human bone, and they also demonstrate high wear and corrosion resistance. They also exhibit superelasticity with a huge recoverable strain up to 17.0%. For these reasons, the novel cobalt-chromium-based alloys can be promising candidates for biomedical applications.