Severe plastic deformation of four FCC metals during friction under lubricated conditions
Severe plastic deformation of four FCC metals during friction under lubricated conditions
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DOI：
10.1016/j.wear.2017.05.018
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发表时间：
2017-09
期刊：
影响因子：
5
通讯作者：
A. Moshkovich;I. Lapsker;Y. Feldman;L. Rapoport
中科院分区：
文献类型：
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作者：
A. Moshkovich;I. Lapsker;Y. Feldman;L. Rapoport
利用销盘摩擦磨损试验机研究了层错能(SFE)对面心立方金属(Ag、Cu、Ni、Al)与1040钢滑动摩擦磨损的影响。摩擦结果以Stribeck曲线表示。研究了弹性流体动力润滑(EHL)向边界润滑(BL)的转变。在试验过程中测量了摩擦磨损系数和接触附近的温度。研究发现，在BL区的摩擦以形成具有稳态硬度(应力)的纳米晶结构为特征。结果表明，磨损系数与稳态硬度/应力(σ，S)和超临界流体力学性能有很好的相关性。结果表明，超临界流体能量和熔化温度在磨损过程中起着重要作用。然而，晶粒度或接触温度并不直接表明磨损率的降低或增加。所研究的面心立方金属的摩擦磨损主要由形变硬化和动态回复决定。与其他金属相比，Ni摩擦(高SFE)下更容易发生位错湮没。镍和铜在较低温度(~0.14 Tm)下的退火表明，在摩擦接触过程中发生了恢复过程。铝的熔化温度较低是其行为与其它面心立方金属不同的原因。
The effects of stacking fault energy (SFE) on the sliding friction and wear of FCC metals (Ag, Cu, Ni, and Al) against Type 1040 steel were studied using a pin-on-disk rig. Friction results were presented as Stribeck curves. The transition from elasto-hydrodynamic lubrication (EHL) to boundary lubrication (BL) was studied. Friction and wear coefficients and the temperature near the contact were measured during the tests. It was found that friction in the BL region is characterized by formation of a nanocrystalline structure with a steady-state hardness (stress) for all studied metals. It was shown that the wear coefficient correlates well with the steady-state hardness/stress (σs) and SFE. It was found that SFE and melting temperature play import roles in the wear process. However, the grain size or contact temperature do not directly indicate a decreasing or increasing wear rate. Friction and wear of the investigated FCC metals is mainly determined by deformation hardening and dynamic recovery. The annihilation of dislocations occurs much more easily under Ni friction (high SFE) than the other metals. Annealing of Ni and Cu at relatively low temperature (~0.14 Tm) suggests that a recovery process occurred during frictional contact. The difference in behavior of Al compared with the other FCC metals is explained by its low melting temperature.