Amorphous metallic foam

Jan Schroers, Chris Veazey, William L. Johnson
2003 Applied Physics Letters  
The bulk glass forming alloy Pd 43 Ni 10 Cu 27 P 20 is processed into a low-density amorphous metallic foam. Pd 43 Ni 10 Cu 27 P 20 is mixed with hydrated B 2 O 3 , 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 Ϫ2 mbar, well-distributed bubbles expand to foam the material. Foam densities as low
more » ... s 1.4ϫ10 3 kg/m 3 were obtained, corresponding to a bubble volume fraction of 84%. The bubble diameter ranges between 2ϫ10 Ϫ4 and 1ϫ10 Ϫ3 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.
doi:10.1063/1.1537514 fatcat:ybwy6okamfhcnb5w5ixdo32wqa