The crystallisation of CoZr amorphous alloys in the range Co92Zr8to Co21Zr79

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Abstract
The authors present a crystallisation study of sputter-deposited Co100-xZrx amorphous alloys prepared at zirconium concentrations between 7 and 80 at.%. The transformation of these alloys from the amorphous to the equilibrium crystalline state has been investigated by thermal analysis, X-ray diffraction and electrical resistance measurements. Their crystallisation temperatures were determined by differential scanning calorimetry (DSC) and by resistance measurements as a function of temperature. X-ray diffraction was used to identify the final phases after heating. The behaviour of the activation energy with composition suggests that there may be a eutectic at the composition Co40.8Zr59.2. The activation energies of the samples are calculated by means of Kissinger plots and the heats of crystallisation are also calculated. Correlations between the thermal analysis and resistance results are discussed.