Fretting Fatigue Properties of Zr-Based Bulk Amorphous Alloy in Phosphate Buffered Saline Solution
Fretting Fatigue Properties of Zr-Based Bulk Amorphous Alloy in Phosphate Buffered Saline Solution
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DOI：
10.2320/jinstmet.69.481
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
N. Maruyama;S. Hiromoto;M. Ohnuma;T. Hanawa
中科院分区：
文献类型：
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作者：
N. Maruyama;S. Hiromoto;M. Ohnuma;T. Hanawa
采用zr基非晶合金（质量%为7.6Ni-12.3Cu-3.5Al-76.6Zr），研究了空气和模拟体液PBS（−）中的微动疲劳性能。在载荷控制下，采用应力比为0.1的正弦波，在空气中频率为20 Hz，在PBS（-）中频率为2 Hz，接触压力为30 MPa进行微动疲劳试验。在空气和PBS（−）环境下，平原疲劳试验的应力-失效循环数（S-N）曲线没有差异，两种环境下107周的疲劳强度都在150 MPa左右。空气中107次微动疲劳强度为平原疲劳强度的1 / 3，PBS（−）中2×106-cycle微动疲劳强度约为空气中微动疲劳强度的2倍。虽然影响微动疲劳强度的试样表面与微动垫之间的摩擦系数在空气和PBS（−）中几乎没有差异，但SEM观察表明，在空气中测试的微动垫在试样表面的实际接触面积比在PBS（−）中测试的小。因此，我们认为空气中微动疲劳强度的降低是由于垫块在空气中的接触压力高于PBS（−）。XPS分析还表明，在空气和PBS（−）中测试的试样表面氧化膜的组成不同，这表明氧化膜组成的差异影响了微动损伤，从而影响了微动疲劳强度。
Fretting fatigue properties were studied in air and in a simulated body fluid, PBS(−), using a commercial Zr-based amorphous alloy (7.6Ni-12.3Cu-3.5Al-76.6Zr in mass%). Fretting fatigue tests were carried out under load control using a sinusoidal wave with a stress ratio of 0.1, a frequency of 20 Hz in air and 2 Hz in PBS(−) and a contact pressure of 30 MPa for fretting. There was no difference between the stress-number of cycles to failure (S-N) curves of the plain fatigue test in air and in PBS(−), and the 107-cycle fatigue strength was approximately 150 MPa for both environments. The 107-cycle fretting fatigue strength in air was one-third as high as the plain fatigue strength, while the 2×106-cycle fretting fatigue strength in PBS(−) was approximately twice as high as that in air. Although the friction coefficient between the specimen surface and the fretting pad, which affects the fretting fatigue strength, was hardly different between air and PBS(−), SEM observations showed that the actual contact area of the fretting pad on the specimen surface tested in air was smaller than that tested in PBS(−). Thus, we considered that the decrease of the fretting fatigue strength in air was caused by the higher contact pressure of the pad in air than that in PBS(−). XPS analyses also showed that the specimens tested in air and in PBS(−) had the different compositions of the oxide films on their surfaces, suggesting that the difference in the composition of the oxide films affect the fretting damage and thus the fretting fatigue strength.