Ti-46Al-2Cr-2Nb和Ti6Al4V合金的干摩擦学性能对比研究
Comparison on Dry Sliding Tribological Behavior of Ti-46Al-2Cr-2Nb and Ti6Al4V Alloys
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摘要: 本文以商业Ti-6Al-4V合金为参照,考察了Ti-46Al-2Cr-2Nb(原子比)金属间化合物在不同载荷和速率下的干摩擦学行为.结果表明:Ti-46Al-2Cr-2Nb和Ti6Al4V合金的摩擦系数几乎相同,而Ti-46Al-2Cr-2Nb金属间化合物比Ti-6Al-4V具有更好的抗磨性;Ti-46Al-2Cr-2Nb和Ti6Al4V合金的磨损率均随载荷的增加而增加,Ti-46Al-2Cr-2Nb合金磨损率随滑动速率增加而增加,Ti-6Al-4V合金磨损率却随滑动速率增加呈下降直至稳定的趋势;Ti-46Al-2Cr-2Nb合金的磨损机制主要为疲劳磨损,Ti-6Al-4V合金的磨损机制为塑性变形,犁沟和剥落.Abstract: The dry-sliding tribological behavior of a Ti-46Al-2Cr-2Nb intermetallic alloy was investigated. For comparative purposes, the tribological behavior of a common Ti-6Al-4V alloy was also examined under the same testing conditions. It was found that the wear resistance of the Ti-46Al-2Cr-2Nb alloy is superior to that of the commercial Ti-6Al-4V alloy. The friction coefficient of both the alloys is comparable. The wear rates of both the Ti-46Al-2Cr-2Nb and Ti-6Al-4V alloys increases with increasing applied load. The wear rate of the Ti-46Al-2Cr-2Nb alloy increases with increasing the sliding speed, but the opposite is true for Ti-6Al-4V alloy. The wear mechanism of the Ti-46Al-2Cr-2Nb alloy is fatigue wear, but that of Ti-6Al-4V alloy is dominated by plastic deformation, plowing and delamination.