Effect of heating rate on crystallization kinetics of amorphous Al91La5Ni4 alloys by DSC

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Abstract

Crystallization kinetics of Al91La5Ni4 amorphous ribbons produced by a melt-spinning method were studied by DSC analysis and X-ray diffraction. The effect of heating rate (from 4 to 200 °C min-1) was investigated in the temperature range from 298 to 700 K. Increases the heating rate from 4 to 200 °C min-1 resulted in increases of the temperature difference between the two stages of the transformation process: crystallization of Al and crystallization of the Al compounds from 148.9 to 167.4 K. The apparent activation energies for the first step, related to Al crystallization, and to the second step related to crystallization of Al4La and Al3Ni, were found to be 161±9 and 199±10 kJ mol-1, respectively. The results indicate the possibility of tailoring the heating treatment to produce the required fraction of the amorphous phase.

Original languageEnglish
Pages (from-to)437-446
Number of pages10
JournalJournal of Thermal Analysis and Calorimetry
Volume56
Issue number1
StatePublished - 1 Jan 1999
EventProceedings of the 1998 7th European Symposium on Thermal Analysis and Calorimetry - Balatonfured, Hung
Duration: 30 Aug 19984 Sep 1998

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