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High‐Temperature Deformation of Stoichiometric 239 PuO 2
Author(s) -
PETROVIC J. J.,
LAND C. C.
Publication year - 1980
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1980.tb10692.x
Subject(s) - materials science , deformation (meteorology) , ductility (earth science) , dislocation , stoichiometry , composite material , diffusion , grain boundary , grain boundary sliding , activation energy , transgranular fracture , compression (physics) , metallurgy , thermodynamics , creep , chemistry , microstructure , physics , organic chemistry , intergranular fracture
The deformation behavior of Stoichiometric 239 PuO 2 was examined at 800° to 1500°C, using direct and diametral compression. Maximum ductility was observed at 1000°C, but above this temperature both strength and ductility decreased and the fracture mode changed from transgranular to inter‐granular. The deformation activation energy measured at 1000°C was 598 kJ/mol. Comparison to the deformation behavior of hypostoichiometric 239 PuO 2‐x suggests that high‐temperature dislocation motion becomes more difficult with increasing O/Pu ratio due to effects of stoichiometry on diffusion rates. Deformation mechanisms in 239 PuO 2 appear to be a combination of dislocation motion and grain‐boundary sliding.