Impact of Sulfur on the melt dynamics of glass forming Ti75Ni25−xSx

Substitution of Nickel by Sulfur leads to bulk metallic glass formation in eutectic Ti75Ni25. In order to understand the improved glass forming ability, a detailed analysis of the melt dynamics was performed. We measured the density, the viscosity, and the self-diffusion of Ti75Ni25−xSx (x = 0, 5, 8...

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Bibliographic Details
Published in:Applied physics letters 2020-07, Vol.117 (1)
Main Authors: Wilden, J., Yang, F., Holland-Moritz, D., Szabó, S., Lohstroh, W., Bochtler, B., Busch, R., Meyer, A.
Format: Article
Language:English
Subjects:
Amorphous materials
Applied physics
Elastic scattering
Glass formation
Magnetic levitation
Melts
Metallic glasses
Microgravity
Neutron scattering
Packing density
Self diffusion
Sulfur
Titanium
Viscosity
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Summary:Substitution of Nickel by Sulfur leads to bulk metallic glass formation in eutectic Ti75Ni25. In order to understand the improved glass forming ability, a detailed analysis of the melt dynamics was performed. We measured the density, the viscosity, and the self-diffusion of Ti75Ni25−xSx (x = 0, 5, 8) melts as a function of temperature. Moreover, the viscosity was measured under reduced gravity conditions to benchmark ground-based data. The self-diffusion coefficients were probed by incoherent, quasi-elastic neutron scattering. All measurements were combined with electrostatic or electromagnetic levitation, in order to process these highly reactive Titanium-based melts. From the measured density, the packing fraction was calculated as a function of temperature. In contrast to other bulk metallic glasses, the decrease in melt dynamics comes along with the decrease in packing density.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0012409