Metastable phase equilibria in codeposited Ni(1x)Zr(x) thin films
Abstract
We determine the glass forming range (GFR) of codeposited Ni(1x)Zr(x) (0 less than x less than 1) thin films by measuring their electrical resistance during in situ constantheatingrate anneals. The measured GFR is continuous for 0.10 less than x less than 0.87. We calculate the GFR of NiZr melts as a function of composition and cooling rate using homogeneous nucleation theory and a published CALPHADtype thermodynamic modeling of the equilibrium phase diagram. Assuming that the main competition to the retention of the amorphous structure during the cooling of the liquid comes from the partitionless crystallization of the terminal solid solutions, we calculate that for dT/dt = 10(exp 12) K/s, the GFR extends to x = 0.05 and x = 0.96. Better agreement with the measured values is obtained assuming a lower effective cooling rate during the condensation of the films.
 Publication:

Presented at the Spring Meeting of the Materials Research Society (MRS
 Pub Date:
 1991
 Bibcode:
 1991mrs..meet.....R
 Keywords:

 Glass;
 Mathematical Models;
 Metastable State;
 Nickel Alloys;
 Phase Diagrams;
 Solidification;
 Thin Films;
 Zirconium Alloys;
 Amorphous Materials;
 Annealing;
 Cooling;
 Crystallization;
 Electrical Resistance;
 Nucleation;
 Solid Solutions;
 Thermodynamic Equilibrium;
 SolidState Physics