Amorphous metallic foam

Schroers, Jan; Veazey, Chris; Johnson, William L.
January 2003
Applied Physics Letters;1/20/2003, Vol. 82 Issue 3, p370
Academic Journal
The bulk glass forming alloy Pd[SUB43]Ni[SUB10]Cu[SUB27]P[SUB20] is processed into a low-density amorphous metallic foam. Pd[SUB43]Ni[SUB10]Cu[SUB27]P[SUB20] is mixed with hydrated B[SUB2]O[SUB3], 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[SUP-2] mbar, well-distributed bubbles expand to foam the material. Foam densities as low as 1.4 × 10[SUP3] kg/m[SUP3] were obtained, corresponding to a bubble volume fraction of 84%. The bubble diameter ranges between 2 × 10[SUP-4] and 1 × 10[SUP-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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