2695.     HOSELITZ, K., AND SUCKSMITH, W.  Magnetic Study of the 2-Phase Iron-Nickel Alloy.  II.  Proc. Roy. Soc. (London), vol. 181, 1943, A, pp. 303-313; Chem. Abs., vol. 37, 1943, p. 6232.

        Earlier method for using the magnetic saturation intensity of annealed Fe-Ni alloys for the determination of the equilibrium phase boundaries is extended.  Lower temperatures are examined.  The mechanism and kinetics of phase changes are studied.  High magnetic fields are employed (16,000 gauss).  Various heat treatments are described, being carried out down to 325°.  The phase diagram of the system is accurately determined as 525°-325°.  The mechanism of the phase segregation from the single phase a state has been studied.  Contrary to the usual case, one of the phases crystallies out in its equilibrium concentration while the residue of the alloy progressively and uniformly approaches equilibrium composition.  The rate of attainment of equilibrium was determined.  It is considered that the lower practical limit of temperature where the equilibrium diagram can be studied by annealing experiments has been reached.