Abstract
Cu58Zr42 amorphous/nanocrystalline composite particles were prepared by ball-milling. The powders were used as base-material of compact samples produced by powder metallurgy (PM). After 3.5h mechanical milling, the powders were predominantly amorphous, which were analysed by XRD to define the amorphous fraction, by TEM and SEM to reveal the microstructure, by DSC to observe the processes during heating in the powder. The structure of the powder shows that in the amorphous part coexist crystalline areas sized 10–20nm and short range order sized below 10nm. By PM, cylindrical green compacts were produced using uniaxial cold pressing at 1GPa and without any lubricant. The aim was to obtain compact samples without any changes in the amorphous/nanocrystalline fraction. The sintering temperature is restricted by the onset of crystallisation temperature (Tx) which causes the change of the amorphous/crystalline structure. Based on the DSC plots of the powders, temperature of 563K and 723K were chosen for sintering.
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