SEDL / STP / STP1405-EB / STP10554S

Post-Irradiation Deformation Microstructures in Fe-9Cr

Gelles, DS
Staff Engineer and Senior Scientist, PNNL Materials Research Department, Richland, WA

Hamilton, ML
Staff Engineer and Senior Scientist, PNNL Materials Research Department, Richland, WA

Schäublin, R
Research Associate, EPFL-CRPP Fusion Technology, Villigen PSI,

Pages: 12    Published: Jan 2001

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Abstract

The deformed microstructures of both irradiated and unirradiated Fe-9Cr uniaxial tensile specimens have been examined to identify controlling mechanisms. Deformation following irradiation is found to occur in poorly defined channels, causing formation of discrete steps at surfaces and delineated by nonuniformly distributed highly elongated voids. Deformation is by motion of a∕2<111> dislocations, which interact with and decompose irradiation-induced a<100> loops. The structure formed after extensive deformation consists of highly complex cell walls and moderate densities of individual slip dislocations.