Spinodal Decomposition of Ni-Nb-Y metallic Glasses

Journal Article · Thu Jan 01 00:00:00 EST 2009 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2008.10.028· OSTI ID:946484

Mattern, Norbert ^[1]; G, Goerigk ^[2]; Vainio, U ^[3]; Miller, Michael K ^[4]; Gemming, T ^[1]; Eckert, J ^[1]

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1. IFW Dresden
2. Forschungszentrum Julich, Julich, Germany
3. HASYLAB at DESY, Hamburg, Germany
4. ORNL

Phase-separated Ni-Nb-Y metallic glasses were prepared by rapid quenching from the melt. The early stages of decomposition were characterized in Ni-Nb-Y alloys with Ni contents of more than 60 at.%. Strongly correlated chemical fluctuations with a nanometer length scale were found to exist in the as-quenched state. The observed fluctuation lengths range from 5 to 12 nm, depending on the actual composition of the glass. The 'frozen-in' early stages of decomposition occur in the deeply undercooled melt due to the reduction in the critical temperature of liquid-liquid phase separation with Ni content. Annealing of the phase-separated Ni{sub 70}Nb{sub 15}Y{sub 15} glass below the crystallization temperature leads to an increase in the amplitude of the fluctuations. However, the wavelength was unchanged, which provides evidence for the spinodal character of the decomposition.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 946484
• Journal Information: Acta Materialia, Vol. 57, Issue 3; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
AMPLITUDES
ANNEALING
CRITICAL TEMPERATURE
CRYSTALLIZATION
FLUCTUATIONS
GLASS
METALLIC GLASSES
QUENCHING
WAVELENGTHS