N. I. Noskova*, E. G. Ponomareva*, and M. M. Myshlyaev**
* Institute of Metal Physics, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 18, Ekaterinburg, 620219 Russia
** Baikov Institute of Metallurgy, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 117334 Russia
Received June 25, 1996
Abstract—High-resolution transmission electron microscopy (HREM) was used to study the structure of
nanophase crystals and their interfaces in multiphase nanocrystalline Fe73Ni0.5Cu1Nb3Si13.5B9 alloy. It was
shown that the interfaces between chemically similar nanophases may have different structures; they may rep-
resent crystalline junctions (with a transition region of no more than 0.2 nm in width) between nanocrystals
whose lattices are misoriented by 2–70°; be twin boundaries; or have a more complex structure with disloca-
tions; or even have an amorphous structure. Interphase interfaces between nanophases with different chemical
compositions may represent a transition crystalline layer, or a strongly elastically distorted quasi-amorphous
layer of up to 2 nm in thickness or even may have a different chemical composition. When grains of chemically
different nanophases are joined, their lattices undergo internal elastic distortions and dislocation dipoles are
formed inside nanocrystals. Defect stability in nanocrystal and nanophase interfaces is different and is deter-
mined by the method of production of the nanocrystalline structure.
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