The effect of minor addition of Al and Nb on bulk glass formability in Cu-50 Zr-50 alloy is investigated. Quenching rate effect was followed comparing the results obtained on ribbons and on different sections of cone-shaped ingots. The phase mixture has been clarified for each alloy, combining structural, microstructural and composition analyses. A fully amorphous phase has been found in ribbons, whereas only for (Cu-50 Zr-50) Al-96(4) a bulk metallic glasses has been obtained. Minor Al addition hinders the formation of the CuZr martensite phase. The effect of composition on the glass forming abilty has been evaluated with emprical parameters, but only the calculation of driving forces for nucleation of crystal phases, using the CALPHAD method, may explain the results.
Glass forming ability of (Cu-50 Zr-50)(96)M-4 (M=none, Al,Nb) bulk metallic glasses
BARICCO, Marcello
2008-01-01
Abstract
The effect of minor addition of Al and Nb on bulk glass formability in Cu-50 Zr-50 alloy is investigated. Quenching rate effect was followed comparing the results obtained on ribbons and on different sections of cone-shaped ingots. The phase mixture has been clarified for each alloy, combining structural, microstructural and composition analyses. A fully amorphous phase has been found in ribbons, whereas only for (Cu-50 Zr-50) Al-96(4) a bulk metallic glasses has been obtained. Minor Al addition hinders the formation of the CuZr martensite phase. The effect of composition on the glass forming abilty has been evaluated with emprical parameters, but only the calculation of driving forces for nucleation of crystal phases, using the CALPHAD method, may explain the results.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
