Computer Science
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt.........5z&link_type=abstract
Thesis (PH.D.)--HARVARD UNIVERSITY, 1995.Source: Dissertation Abstracts International, Volume: 56-07, Section: B, page: 3970.
Computer Science
Scientific paper
A new method for the determination of the average interfacial enthalpy, sigma_sp{A -B}{H}, between unlike phases is presented. A differential scanning calorimeter is used to measure the heat released during precipitation of a superparamagnetic phase from a supersaturated solid solution. The volume fraction distribution of the precipitated phase is determined by maximum entropy modeling of the magnetization, measured to ultra-high fields, as a linear superposition of Langevin functions. Transmission electron microscopy is used to determine the aspect ratios of the precipitates, which is combined with the volume fraction distributions to calculate the total interfacial area in each specimen. The saturation magnetization is used to determine the total amount of the precipitated phase in each sample. The changes in enthalpy, interfacial area, and amount precipitated are used in a thermodynamic and kinetic model to calculate the interfacial enthalpy and heat of mixing. This method is applied to Ag-(5-10)at.% Ni alloys, produced in thin-film form by electron-beam co-evaporation. The average interfacial enthalpy between Ag and Ni, sigma_sp {Ag-Ni} {H}, and the heat of mixing are found to be, respectively, 0.779 +/- 0.076 J/m^2 and 3.59 +/- 0.03 kJ/mol for the average alloy composition of 6.89 at.% Ni.
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