Abstract
Immiscible Cu alloys (Cu–Ag, Cu–Ta, Cu–W) have been prepared by using the following two methods: (a) inert gas condensation followed by an integrated cold compaction step and (b) high-energy ball milling. Duplex microstructures obtained from evaporation of a prealloy or by ball milling of the respective elemental powder ingredients are thermally rather stable and show homogeneous grain growth. The specific heat of mechanically alloyed Cu–W shows an anomalous behaviour for milling times around 25 h indicating a minimum in the thermal stability at an intermediate stage of mechanical deformation.