Journal
ACTA MATERIALIA
Volume 52, Issue 17, Pages 5031-5041Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2004.07.005
Keywords
metallic glasses; rapid solidification; X-ray diffraction; differential scanning calorimetry; phase transformation kinetics
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The crystallisation behaviour of melt spun amorphous ribbon of Al87Ni7La5Zr alloy was studied. The transformed fraction of the alpha-Al phase which forms in a primary reaction from the amorphous matrix was determined by means of WAXS, SAXS and DSC measurements. There is a marked difference in the results given by different techniques. Transformed fractions obtained with XRD refer to the real crystal weight (volume) fraction which is lower than that obtained from DSC. The difference may be accounted for by the heat released due to matrix homogenisation, which is diffusion controlled and overlaps with this stage of crystallisation. Crystal shape, size and distribution were analysed by TEM and SAXS obtaining a clear picture of the microstructure made of fine alpha-Al crystals grouped in clusters. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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