Determination of solidus and liquidus in the system Cu-Ni by the spot technique

The solidus and liquidus in the system Cu-Ni over the entire composition range were determined by using the spot-technique. The solidus temperatures of some nickel rich alloys were also investigated using differential thermal analysis (DTA). The experimental data obtained were shown to be in agreement with the assessed values. The experimental set up used in this study was an improvised version of the apparatus used in earlier studies. It was demonstrated that by using this set up the temperatures of melting transitions could be determined within ±2 K. Temperature calibration was carried out by determining the melting points of pure metals viz., Au, Ni and Cu. The salient features and the utility of the 'spot-technique' were also demonstrated.