Calorimetric study of the crystallization kinetics of Cu{sub 47}Ti{sub 33}Zr{sub 11}Ni{sub 8}Si{sub 1} metallic glass

Journal Article · Thu Mar 01 04:00:00 EST 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.75.104206· OSTI ID:20957763

Venkataraman, S ^[1]; Hermann, H; Mickel, C; Schultz, L; Eckert, J ^[2]; Sordelet, D J ^[3]

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1. FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universitaet Darmstadt, Petersenstrasse 23, D-64287 Darmstadt (Germany)
2. Leibniz-Institut fuer Festkoerper- und Werkstoffforschung Dresden, Helmholtzstrasse 20, D-01069 Dresden (Germany)
3. Material and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50014 (United States)

The isochronal and isothermal activation energies for the primary crystallization process of Cu{sub 47}Ti{sub 33}Zr{sub 11}Ni{sub 8}Si{sub 1} metallic glass powders subjected to varying thermal treatments have been evaluated by differential scanning calorimetry and determined using the Kissinger approach and the Johnson-Mehl-Avrami (JMA) analysis, respectively. The values of the differential Avrami exponent are also determined from the isothermal data. Assuming diffusion-controlled growth, it is shown that thermal treatment of the samples in the supercooled liquid region considerably influences the behavior of the nucleation rate during the crystallization process. Microstructural investigations indicate that the thermal treatment is accompanied by precipitation of fine nanocrystals in an amorphous matrix. The values for the activation energies determined by both the Kissinger approach and the JMA analysis are similar for the as-prepared powder, but a significant difference is found for the thermally treated powders. This discrepancy is explained on the basis of the fundamental assumptions made in the models. It will be shown that the Kissinger method fails if the differential Avrami exponent changes significantly during the transformation process.

• OSTI ID: 20957763
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 10 Vol. 75; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
CALORIMETRY
COPPER ALLOYS
CRYSTALLIZATION
HEAT TREATMENTS
KINETICS
METALLIC GLASSES
MICROSTRUCTURE
NANOSTRUCTURES
NICKEL ALLOYS
NUCLEATION
POWDERS
PRECIPITATION
SILICON ALLOYS
TITANIUM ALLOYS
ZIRCONIUM ALLOYS