Abstract
The wear and friction behavior of materials depends on the structure of the surface layers that can develop during sliding contact. The evolving dynamic recrystallization process of the friction layer of Ni3Al matrix composites (NMCs) at different contact loads was characterized. A pin-on-disk contact geometry was used. Silicon nitride ceramic was chosen as the pin material because of its inertness. A wear-induced tribo-layer composed of a grain growth layer and a nanocrystalline (NC) structured layer was formed. The soft wear-induced (0.6GPa) layer, supported by the harder NC structure layer (7.4GPa), is proposed to be beneficial both to achieving a low friction coefficient and a high wear resistance for the NMCs.
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