EFFECT OF ANNEALING ON THE STRUCTURE AND HARDENING OF HEAT-RESISTANT CASTABLE ALUMINUM ALLOY AN2ZhMts

The structure and properties of castable alloy AN2ZhMts of the Al – Ni – Fe – Mn – Zr system based on an (Al) + Al9FeNi eutectic are studied after multistage annealing. The mode of annealing for maximum hardness is determined. The effect of the processes occurring during the annealing on the hardness and electric resistivity is estimated. The properties of alloy AN2ZhMts in annealed condition are compared to those of widely used heat treated copper-free silumins of types AK7ch and AK9ch.