Author(s)

F. Findik & F. Rehman

Abstract

A spinodal Cu-Ni-Cr alloy F. Findik, F. Rehman EM Group Dept. of Materials, Imperial College ABSTRACT The Cu-Ni binary system is considered to be an ideal isomorphous system. However, the addition of a ternary alloying element such as Fe, Sn, or Cr is known to introduce miscibility gaps which make these alloys susceptible to heat treatment and change the properties of the binary alloys. Use is widely made of Cu-Ni-Fe alloys as magnetic materials, and Cu-Ni-Sn alloys, after appropriate heat treatment, possess very high elastic limits and are therefore attractive as spring materials. An application of Cu-Ni- Cr alloys is for condenser tubes in sea atmospheres. In this work, Cu-30wtNi-2.5wtCr alloy has been prepared by melting under vacuum and then homogenised. After that, it is heat treated in the range of 300-800°C, and the microstructure and strength of the alloy has been changed via spinodal decomposition. The best temperature and time are found for the optimum mechanical

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