Effect of conditions of ion-plasma deposition of aluminides on structure and hardness of aluminium and dural substrates

摘要

The changes in microhardness and structure of substrates made of pure aluminium and alloy D16T after the ion-plasma deposition of coatings of Al{sub}55Cu{sub}20Fe{sub}20Ni{sub}14Si alloy are investigated. It is shown that the hardness of thecoating itself and a transition layer, as well as its depth significantly depends on the shear stress on the substrate, other conditions being equal. It was established that the strengthened sublayer exceeds the thickness of the coating itself by 2...3orders. The. distribution of iron in depth corresponds to the presence of iron-containing intermetallic phases and to the high level of sublayer strengthening (150...200mkm). The strengthening of the transition layer at a large depth is associated withstructural changes caused by diffusion-initiating polygonization and recrystallization.