Abstract The crystallization of the amorphous Cu60Zr40 alloy has been studied by differential scanning calorimetry (DSC), scanning Auger microprobe (SAM) and transmission electron microscopy (TEM). The DSC trace showed that the sample exhibited a glass transition at 750 K and a strong exothermic effect beginning from 782 K. An enrichment of the element Zr and significant oxygen contamination in a zone near the surface to a depth of about 10 nm were revealed by SAM in the analysis of surface competition and depth profiles of the Cu60Zr40 sample. Also, the change of concentration ratio of Ca to Zr in amorphous matrix at the clean Cu60Zr40 surface as a function of annealing temperature was examined in detail, and it was found that the concentration of Zr at the surface is slightly higher than that in the bulk until 780K and that the concentration ratio of Cu to Zr in matrix has an abrupt increase in the temperature range of 780-800K. The observations by high resolution TEM revealed the appearance of cluster-like regions of approximately 1.5-2.0 nm in size just before crystallization and they distributed randomly throughout the sample. This phenomenon is analogous to the results obtained using field ion microscopy (FIM) by the present authors. The microstructural changes of the sample daring heating show the gradual crystallization of the amorphous matrix.
Received: 06 June 1994
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China.
Cite this article:
BAO CHANG-LIN (包昌林), LU HUA (陆华), XUE QI-KUN (薛其坤), ZHANG XIAO-JUN (张小军), CUI YU-DE (崔玉德) A STUDY OF THE CRYSTALLIZATION OF AMORPHOUS Cu60Zr40 ALLOY 1995 Acta Physica Sinica (Overseas Edition) 4 268
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