加载方式与模拟体液环境对植入用Ti-6Al-7Nb合金疲劳性能的影响
Effect of Loading Mode and Simulated Body Fluid Environment on Fatigue Properties of Implanted Ti-6Al-7Nb Alloy
DOI: 10.12677/IJM.2019.81008, PDF,    国家自然科学基金支持
作者: 李权, 王清远, 刘永杰：四川大学建筑与环境学院破坏力学与工程防灾减灾四川省重点实验室，四川 成都
关键词: Ti-6Al-7Nb；加载方式；模拟体液；疲劳寿命；裂纹萌生；Ti-6Al-7Nb； Loading Mode； Simulated Body Fluid； Fatigue Life； Crack Initiation
摘要: Ti-6Al-7Nb合金近年来已发展成为医用植入物较理想的功能结构材料，为了保证植入材料的可靠性和安全性，需要对其服役状态下的力学行为进行评估。本文采用宏观力学测试结合微观显微观察的方法，研究了加载方式和模拟体液环境对植入用Ti-6Al-7Nb合金的疲劳行为的影响。结果显示，加载方式对Ti-6Al-7Nb合金的疲劳行为有较大影响，弯曲加载比轴向加载得到的疲劳强度更高；模拟体液环境下，Ti-6Al-7Nb合金的疲劳性能略低于常规空气环境，这是因为模拟体液环境中，疲劳加载可能会破坏试样表面的钝化膜，导致疲劳性能降低；疲劳裂纹均萌生于试样表面。
Abstract: Ti-6Al-7Nb alloy has been developed as an ideal functional structural material for surgical implants in recent years. In order to ensure the reliability and safety of the implants, it is necessary to evaluate the mechanical behavior of the implants in service. In this paper, the effects of loading mode and simulated body fluid environment on the fatigue behavior of Ti-6Al-7Nb alloy for im-plantation were studied by means of macromechanics test and microscopic observation. The results show that the fatigue behavior of Ti-6Al-7Nb alloy is greatly affected by loading mode, and the fatigue strength under bending loading is higher than that under axial loading; the fatigue performance of Ti-6Al-7Nb alloy under simulated body fluid environment is slightly lower than that under conventional air environment, because in simulated body fluid environment, fatigue loading may destroy the passivation film on the surface of the sample, leading to the decrease of fatigue performance. The fatigue crack initiation occurs on the surface of the specimen.
文章引用：李权, 王清远, 刘永杰. 加载方式与模拟体液环境对植入用Ti-6Al-7Nb合金疲劳性能的影响[J]. 力学研究, 2019, 8(1): 65-72. https://doi.org/10.12677/IJM.2019.81008

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