Studies on the crystallization kinetics of Cu-reinforced partially crystalline Cu47Ti33Zr11Ni8Si1 metallic glass composite

TitleStudies on the crystallization kinetics of Cu-reinforced partially crystalline Cu47Ti33Zr11Ni8Si1 metallic glass composite
Publication TypeJournal Article
Year of Publication2007
AuthorsVenkataraman S, Eckert J, Schultz L, Sordelet DJ
Journal TitleJournal of Alloys and Compounds
Volume434
Pages203-206
Date PublishedMay
Type of ArticleProceedings Paper
ISBN Number0925-8388
Accession NumberISI:000246286900053
Keywordsalloys, AVRAMI EXPONENT, BULK, CU47TI34ZR11NI8, kinetics, LOCAL VALUE, metallic glasses, microstructure, phase transition, powder metallurgy, powders, thermal analysis
Abstract

The crystallization kinetics of partially crystalline Cu47Ti33Zr11Ni8Si1 gas atomized powder (GAP) and composites was studied by differential scanning calorimetry. The activation energy for crystallization as determined by the Kissinger equation is nearly equal for the particle-free powder (3.43 +/- 0.40 eV) and the composite (3.11 +/- 0.22 eV). The activation energy of crystallization derived from isothermal annealing experiments is nearly similar for the GAP (4.53 +/- 0.40 eV) and the composite (4.25 +/- 0.40 eV). The values of the Avrami exponent suggest that the crystallization is diffusion controlled. The local Avrami exponent suggests that surface nucleation is active in GAP but bulk crystallization dominates in milled composite powder. (C) 2006 Elsevier B.V. All rights reserved.

DOI10.1016/j.jallcom.2006.08.140
Alternate JournalJ. Alloy. Compd.