Accession Number : ADA017668

Title :   Thermodynamics of Alloys. Vapour Pressure Studies of Manganese-Nickel and Manganese-Silicon Liquid Alloys.

Descriptive Note : Final technical rept. May 74-Apr 75,

Corporate Author : BIRMINGHAM UNIV (ENGLAND) DEPT OF PHYSICAL METALLURGY AND SCIENCE OF MATERIALS

Personal Author(s) : Pratt,J. N. ; Ahmad,N.

Report Date : JUN 1975

Pagination or Media Count : 38

Abstract : The vapor pressures of manganese over liquid manganese-nickel and manganese-silicon alloys have been measured using a high-temperature torsion-effusion technique. Some modifications of the previously described apparatus and technique are outlined. Alloys containing from 0 to 93 atomic per cent nickel were investigated over the temperature range 1316 to 1900K and the measured pressure values were used to calculate the partial and integral properties of the liquid alloys at 1750K. The activities of the components show moderate negative deviations from ideality, while the excess entropies are positive and integral heats of formation are negative and irregular in form. Similar studies of manganese-silicon liquids (0-90 atomic percent silicon) between 1365 and 1785K have been used to evaluate the thermodynamic properties of this system at 1700K.

Descriptors :   *Thermodynamics, *Liquid metals, *Alloys, Vapor pressure, Manganese alloys, Nickel alloys, Silicon alloys, Ferromagnetic materials, Great Britain

Subject Categories : Metallurgy and Metallography
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE