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首页> 外文会议>American Society of Mechanical Engineers(ASME)/Society of Tribologists and Lubrication Engineers(STLE) International Joint Tribology Conference 2004(IJTC 2004) vol.1 pt.A; 20041024-27; Long Beach,CA(US) >Fretting Fatigue Behavior of Cu-Al Coated Ti-6Al-4V
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Fretting Fatigue Behavior of Cu-Al Coated Ti-6Al-4V

机译：Cu-Al涂层Ti-6Al-4V的微动疲劳行为

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摘要

Fretting fatigue behavior of Cu-Al coating deposited on the alumina-gritted Ti-6Al-4V substrate was investigated. Two types of tests were conducted. One series of tests involved fretting fatigue tests at different bulk stress amplitudes with a constant contact load and the other one at different contact loads with a constant bulk stress amplitude. The coefficient of friction (COF) was lower on the coated substrate than on the bare substrate before fretting. However, COFs of the coated and bare (i.e. uncoated) substrates were identical after the exposure to fretting fatigue cycles. Further, fretting fatigue caused the wear of coating. The coating thickness as a function of fretting fatigue cycles was monitored. The coating damage increased as the applied bulk stress amplitude increased. At lower bulk stress amplitudes, the coating damage was gradual and it survived over one million cycles. However, the coating delaminated from the gritted surface and/or caused the premature specimen failure at higher stress amplitudes. At a lowest contact load used in the present study, the contact condition was gross slip and life of coating was shortest due to fretting wear. On the other hand, the higher contact loads induced partial slip that caused less coating damage, and the coating life increased with increasing contact load.
机译：研究了沉积在氧化铝砂Ti-6Al-4V基体上的Cu-Al涂层的微动疲劳行为。进行了两种类型的测试。一系列测试涉及在具有恒定接触载荷的不同整体应力振幅下的微动疲劳试验，以及另一组在具有恒定接触应力的不同接触负荷下的微动疲劳试验。微动之前，涂覆的基材上的摩擦系数（COF）低于裸露的基材上的摩擦系数。然而，在经受微动疲劳循环之后，涂覆的和裸露的（即未涂覆的）基材的COF相同。此外，微动疲劳导致涂层的磨损。监测作为微动疲劳循环的函数的涂层厚度。涂层损伤随着所施加的整体应力幅度的增加而增加。在较低的整体应力振幅下，涂层损坏是逐渐的，并且可以承受一百万次循环。然而，涂层从磨砂表面分层和/或在较高的应力振幅下导致样品过早失效。在本研究中使用的最低接触载荷下，由于微动磨损，接触条件为毛滑，涂层寿命最短。另一方面，较高的接触载荷会引起部分滑移，从而导致较少的涂层损坏，并且涂层寿命会随着接触载荷的增加而增加。

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