Structure and mechanical properties of microcrystalline alloys of the system Ni?Fe?Zr

Abstract

1. Alloys of the system Ni−Fe−Zr with an atomic fraction of zirconium not more than 0.5% solidify from the melt by a cellular mechanism, but with a content of 3–8.5% Zr solidification from the melt occurs by a dendritic mechanism. 2. The crystallographic texture of Ni−Fe−Zr-alloys is characterized by orientations {100} . 3. During annealing at temperatures up to 900°C grain growth in alloys with ≤0.5% Zr does not occur. 4. On alloying with zirconium there is strengthening of microcrystalline Ni−Fe-alloys which is due to refinement of the structure and the presence of Ni5Zr phase particles. The maximum microhardness (1250 N) is obtained for alloy Ni-15% Fe-8.5% Zr after annealing at 600°C. The maximum ultimate breaking strength (σf = 1000 N/mm2) occurs for alloy Ni-15% Fe-3% Zr after annealing at 900°C.