THE FEATURES OF THE PHASE TRANSFORMATIONS IN INTERMETALLIC PHASES IN ZIRCONIUM ALLOYS

Abstract

On the basis of experimental data the analysis of phase changes in intermetallic phases in alloys on the basis of zirconium (Zr – 1,03 ат.% Fe; Zr – 0,51 ат.% Fe; Zr – 0,51 ат.% Fe – М (М = Nb, Sn,Ta) is carried out. We used experimental techniques: Mössbauer spectroscopy on 57Fe nuclei in backscattering geometry with the registration of the internal conversion electrons, X-ray analysis, X-ray diffraction and electron microscopy. As a result is found the interrelation between process of growth of inclusions of intermetallic phases and segregation of these phases. The growth of particles derived by phase transformation, recrystallization and interrelated. In our case the detected phase separation of two types, so iron is transferred from one phase to another at short diffusion paths. The kinetics growth of inclusions is not controlled by bulk diffusion, and a lower value of the activation energy of migration of iron atoms can be bound with existence of enhanced diffusion paths and interphase borders.

Keywords

• zirconium
• alloys
• phases
• growth
• segregation