MEASURED AND CALCULATED THERMOELASTIC PROPERTIES OF SUPERSATURATED FCC NI(AL) AND NI(ZR) SOLID-SOLUTIONS

Metastable face-centered cubic (fcc) solid solutions of Ni1-xAlx and N i1-xZrx have been prepared in thin-film form using de planar magnetron sputtering in a UHV system. In both these alloy systems, extended sol ubilities in the fee phase and a pronounced (111) texture are observed after sputter deposition. An amorphous phase is found to form in Ni1- xAlx for x greater than or equal to 0.30 and in Ni1-xZrx for x greater than or equal to 0.05. Lattice constants, thermal expansion coefficie nts, and Debye temperatures were derived from x-ray diffraction measur ements. These parameters were also calculated by using nb initio metho ds in the framework of the local-spin density and coherent potential a pproximations for the electronic subsystem and the Debye-Gruneisen mod el for the vibrational properties of the nuclei subsystem. Experiment and theory are compared and discussed.