THE INFLUENCE OF ANNEALING ATMOSPHERE ON THE FORMATION OF NANOCRYSTALS FROM DEVITRIFICATION OF A TI38.5CU32CO14AL10ZR5.5 AMORPHOUS ALLOY

Authors
BATTEZZATI L BARICCO M FORTINA P MYUNG WN
Citation
L. Battezzati et al., THE INFLUENCE OF ANNEALING ATMOSPHERE ON THE FORMATION OF NANOCRYSTALS FROM DEVITRIFICATION OF A TI38.5CU32CO14AL10ZR5.5 AMORPHOUS ALLOY, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 226, 1997, pp. 503-506
Citations number
11
Categorie Soggetti
Material Science
Journal title
Materials science & engineering. A, Structural materials: properties, microstructure and processing → ACNP
ISSN journal
09215093
Volume
226
Year of publication
1997
Pages
503 - 506
Database
ISI
SICI code
0921-5093(1997)226:<503:TIOAAO>2.0.ZU;2-8
Abstract
The kinetics of the polymorphic transformation of a Ti38.5Cu32Co14Al10 Zr5.5 glassy alloy to an ordered bcc phase was determined by means of combined DSC, XRD and TEM experiments. Samples annealed isothermally u nder Ar at 723 K for 5, 10, 15, 20 min contain crystals up to 20 nm in size. After the quick formation of nanocrystals, growth is almost blo cked. Samples contained in Al pans sealed in a glove box, gave DSC sig nals significantly displaced at longer times showing an effect of the annealing atmosphere on the crystallization kinetics. This was confirm ed by annealing other samples in vacuum. The size of the crystals afte r these longer annealings is still in the nanometer range. The size di stribution, determined on TEM micrographs is compatible with nucleatio n on homogeneously distributed impurities. (C) 1997 Elsevier Science S .A.