Non-isothermal crystallization and isothermal transformation kinetics of the Ni68.5Cr14.5P17 metallic glass

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1989 English Publisher:Springer Science and Business Media LLCJournal:Journal of Materials Science, volume 24, pages 139-142 (issn: 0022-2461, eissn: 1573-4803,

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Authors: C. F. Conde; H. Miranda; A. Conde; R. Marquez;

doi: 10.1007/bf00660945

Non-isothermal crystallization and isothermal transformation kinetics of the Ni68.5Cr14.5P17 metallic glass

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Abstract

Non-isothermal crystallization of the Ni68.5Cr14.5P17 alloy is characterized by differential scanning calorimetry (DSC) and X-ray techniques. Transformation occurs in two stages at peak temperatures 622±1 and 692±1 K (at 20 K min−1), with ΔH1=1.50+0.1 kJ mol−1 and ΔH2=3.0±0.1 kJ mol−1. Precipitation of a nickel phase occurs in the first stage and a (NiCr)3 P phase is formed during the second stage. An approach to the isothermal kinetics of the two crystallization events is derived within the frame work of the Johnson-Mehl-Avrami theory.

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