scholarly journals A magnetic study of the two-phase iron-nickel alloys. II

1943 ◽  
Vol 181 (986) ◽  
pp. 303-313 ◽  
Keyword(s):  
Nickel Alloys ◽  
Equilibrium Diagram ◽  
Equilibrium Phase ◽  
Equilibrium Concentration ◽  
Phase Segregation ◽  
Two Phase ◽  
Saturation Intensity ◽  
Iron Nickel ◽  
Practical Limit ◽  
Iron Nickel Alloys

The method of using measurements of magnetic saturation intensity of annealed iron-nickel alloys for the determination of the equilibrium phase boundaries, as demonstrated by Pickles & Sucksmith, has been extended. The phase diagram of the system has been determined accurately between 525 and 365° C. The mechanism of phase segregation from the single-phase a-state has been studied, where it was found that contrary to the usual case, one of the phases crystallizes out in its equilibrium concentration whilst the residue of the alloy progressively and uniformly approaches equilibrium com position. It was possible to study and express quantitatively the rate of attainment of equilibrium , and on evidence obtained in this way the view is based that the lower practical limit of temperature where the equilibrium diagram can be studied by annealing experiments has been reached.

scholarly journals A magnetic study of the two-phase iron-nickel alloys

1940 ◽  
Vol 175 (962) ◽  
pp. 331-344 ◽  
Keyword(s):  
Thermal Hysteresis ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Two Phase ◽  
Saturation Intensity ◽  
Visual Evidence ◽  
Magnetic Investigation ◽  
Iron Nickel ◽  
Lower Temperature ◽  
Iron Nickel Alloys

The iron-rich alloys of iron and nickel resemble pure iron in that they undergo a phase change from body-centred cubic ( α ) structure to face-centred cubic ( γ ) structure on heating. On cooling the alloys, however, the return to the original state takes place at a much lower temperature, and on account of this thermal hysteresis the alloys are known as irreversible. A magnetic investigation of these alloys has been made by Peschard (1925), who measured the variation of the saturation intensity of the alloys with temperature. The change from the α to the γ lattice is accompanied by a decrease of the saturation intensity of the alloy, since the γ phase is non-magnetic at the temperature of the change. Curves showing the variation of intensity with temperature are very useful in the study of these alloys, since they give visual evidence of the irreversibility. The relation of the irreversible changes to the equilibrium phase diagram is not clearly understood. Recently, however, equilibrium diagrams of the iron-nickel system, determined by means of X-ray data, have been published by Bradley and Goldschmidt (1939) and Owen and Sully (1939).

scholarly journals Phase composition of galvanic iron-nickel alloys obtained using pulsed current

2021 ◽  
Vol 22 (1) ◽  
pp. 141-145
Author(s):  
R.P. Ganich ◽  
V.O. Zabludovsky ◽  
V.V. Artemchuk ◽  
Y.V. Zelenko ◽  
R.V. Markul
Keyword(s):  
Phase Composition ◽  
Nickel Alloys ◽  
Pulse Current ◽  
Equilibrium Diagram ◽  
Component Composition ◽  
Pulse Action ◽  
Unipolar Pulse ◽  
Iron Nickel ◽  
The Moment ◽  
Iron Nickel Alloys

The paper presents the results of studying the phase composition of iron-nickel alloys obtained by unsteady electrolysis. It was found that the use of a unipolar pulse current leads to a significant increase in the crystallization overvoltage at the crystallization front at the moment of the pulse action, which affects the component composition of the coatings. The phase composition of the alloys formed at the cathode differs from that shown in the iron-nickel equilibrium diagram.

Mass transport of carbon in one and two phase iron-nickel alloys in a temperature gradient

1982 ◽  
Vol 13 (10) ◽  
pp. 1713-1719 ◽  
Author(s):  
I. C. I. Okafor ◽  
O. N. Carlson ◽  
D. M. Martin
Keyword(s):  
Temperature Gradient ◽  
Mass Transport ◽  
Nickel Alloys ◽  
Two Phase ◽  
Iron Nickel ◽  
Iron Nickel Alloys

DIFFUSION OF Ni63 IN IRON, COBALT, NICKEL, AND TWO IRON–NICKEL ALLOYS

1959 ◽  
Vol 37 (10) ◽  
pp. 1629-1636 ◽  
Author(s):  
J. R. MacEwan ◽  
J. U. MacEwan ◽  
L. Yaffe
Keyword(s):  
Surface Activity ◽  
Nickel Alloys ◽  
Nickel Content ◽  
The Self ◽  
Iron Cobalt ◽  
Self Diffusion ◽  
Cobalt Nickel ◽  
Iron Nickel ◽  
Iron Nickel Alloys ◽  
Cobalt And Nickel

The self-diffusion of nickel and the diffusion of Ni63 into iron, cobalt, and two iron–nickel alloys was studied using the technique of decrease in surface activity, The nickel self-diffusion results are compared to previously reported values. Nickel is found to diffuse more slowly than iron in the iron-rich portion of the iron–nickel system. The rate of nickel diffusion increases with increasing nickel content. A comparison is made between the present results for diffusion of Ni63 into iron, cobalt, and nickel with reported values for diffusion of Co60 and Fe59 in the same metals. In each solvent, the magnitudes of the activation energies, Q, are such that QNi > QCo > QFe.

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