Influence of neutron irradiation on dislocation structure and phase composition of Zr-base alloys
- A.A. Bochvar All-Russia Scientific Research Inst. of Inorganic Materials, Moscow (Russian Federation)
- Research and Design Inst. of Power Engineering, Zarechny (Russian Federation)
- V.I. Lenin Scientific Research Inst. of Atomic Reactors, Dimitrovgrad (Russian Federation)
Studied were evolution of dislocation structure, phase, and element composition of binary alloys Zr-1Nb and Zr-2.5Nb and multicomponent alloys Zr-1Nb-1.2Sn-0.4Fe and Zr-1.25n-0.4Fe under neutron irradiation. The investigations were carried out using cladding and pressure tubes before and after irradiation to a fluence of {approximately}10{sup 26} n/m{sup 2} (E {ge} 0.1 MeV) in experimental and commercial reactors at 300 to 350 C using TEM, EDX, and XRD. In most cases, irradiation-induced defects are in the form of dislocation loops with Burgers vector 1/3 <11{bar 2}0>. The density of dislocations with a component is less than 2 {times} 10{sup 14} m{sup {minus}2}. A higher fluence or the presence of strain results in the ordering of the dislocation structure of component and -type dislocation loops. Before irradiation, the multicomponent alloys contain fine precipitates of Zr-Nb-Fe composition, and the matrix is depleted in Fe. Under irradiation, recrystallization proceeds intensely (as distinct from Zr-Nb alloys), changes take place in size, distribution, and composition of precipitates (with a relative decrease of Fe content compared to Nb), and the Fe content of {alpha}-Zr matrix is increased. None of the materials studied showed any significant evidence of secondary phase particle amorphization. The density of dislocations with and components and irradiation-induced defects, their mean size, the extent of ordering, and the planes of their occurrence were determined. A comparison was made between irradiation-induced evolutions of microstructures of the different alloys.
- OSTI ID:
- 479455
- Report Number(s):
- CONF-950926-; TRN: 97:010524
- Resource Relation:
- Conference: 11. international symposium on zirconium in the nuclear industry, Garmisch-Partenkirchen (Germany), 11-14 Sep 1995; Other Information: PBD: 1996; Related Information: Is Part Of Zirconium in the nuclear industry: Eleventh international symposium; Bradley, E.R. [ed.] [Sandvik Special Metals Corp., Kennewick, WA (United States)]; Sabol, G.P. [ed.] [Westinghouse Electric Corp., Pittsburgh, PA (United States)]; PB: 911 p.; American Society for Testing and Materials STP 1295
- Country of Publication:
- United States
- Language:
- English
Similar Records
Zirconium alloy E635 as a material for fuel rod cladding and other components of VVER and RBMK cores
Evolution of microstructure in zirconium alloys during irradiation