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首页> 外文会议>ASME/STLE International Joint Tribology Conference >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的烦恼行为

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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磨削的Ti-6AL-4V基板上的Cu-Al涂层的疲劳疲劳行为。进行了两种类型的测试。一系列测试涉及在不同的散装应力幅度下的疲劳试验，其具有恒定的接触载荷，另一个在不同的接触载荷中具有恒定的散装应力幅度。在涂覆的基材上比在涂覆之前较低的摩擦系数（COF）较低。然而，在暴露于微动疲劳循环后，涂覆和裸（即，未涂层）底物的COF是相同的。此外，微动疲劳导致涂层的磨损。监测作为疲劳循环功能的涂层厚度。随着施加的散装应力幅度增加，涂层损坏增加。在较低散装应力振幅下，涂层损伤是渐进的，它在超过一百万个周期中存活。然而，涂层从砂砾表面分层和/或在更高的应力幅度下引起过早的样品失效。在本研究中使用的最低接触载荷，接触条件是总体滑移，由于磨损磨损，涂层的寿命是最短的。另一方面，较高的接触载荷引起造成较少涂层损坏的部分滑动，并且涂布寿命随着接触载荷的增加而增加。

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