Amorphous metallic foam | Zendy

Jan Schroers | Zendy; Chris Veazey | Zendy; William L. Johnson | Zendy

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Amorphous metallic foam

Author(s) -

Jan Schroers,

Chris Veazey,

William L. Johnson

Publication year - 2003

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1537514

Subject(s) - liquidus , amorphous metal , materials science , differential scanning calorimetry , amorphous solid , bubble , alloy , composite material , metal foam , volume fraction , viscosity , superheating , thermodynamics , porosity , chemistry , crystallography , physics , parallel computing , computer science

The bulk glass forming alloy Pd43Ni10Cu27P20 is processed into a low-density amorphous metallic foam. Pd43Ni10Cu27P20 is mixed with hydrated B2O3, which releases gas at elevated temperature and/or low pressure. Very homogeneous foams are achieved due to the high viscosity of the alloy even at its liquidus temperature. By processing at the liquidus temperature and decreasing the pressure to 10^–2 mbar, well-distributed bubbles expand to foam the material. Foam densities as low as 1.4×10^3 kg/m^3 were obtained, corresponding to a bubble volume fraction of 84%. The bubble diameter ranges between 2×10^–4 and 1×10^–3 m. Thermal analysis by differential scanning calorimetry confirms the amorphous nature of the foam. Furthermore, it reveals that the foam's thermal stability is comparable to the bulk material.

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