Structural Transformations in Quasibinary System Alloys
with L1₂ Superlattice

V. I. Goman’kov*, S. M. Tret’yakova*, and L. E. Fykin**

* Russian Federation Scientific Center, Institute of Precision Alloys, Bardin Central Research Institute
for the Iron and Steel Industry, Vtoraya Baumanskaya ul. 9/23, Moscow, 107005 Russia
** Russian Federation Scientific Center, Karpov Institute of Physical Chemistry,
ul. Vorontsovo Pole 10, Moscow, 103064 Russia

Received June 9, 1997

Abstract—Structural order–disorder transformations in Ni₃Fe–Ni₃Al, Ni₃Mn–Ni₃Al, and Ni₃Mn–Ni₃Ga
alloys were studied by neutron diffraction and calorimetry. Concentration transformations in the L1₂-type
superstructures were established to be isomorphic. Kurnakov points (order–disorder transformation tempera-
tures) were measured and phase diagrams were constructed showing the two-phase ( + ') fields. A mechanism
for the + ' field formation was suggested, based on the local structure of the alloys. Site preference of alloying
elements in the L1₂ superlattice was determined.

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