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High‐Temperature Deformation of Hypostoichiometric 239 PuO 2
Author(s) -
PETROVIC J. J.
Publication year - 1979
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.1151-2916.1979.tb19051.x
Subject(s) - strain rate , deformation (meteorology) , materials science , ductility (earth science) , strain (injury) , grain boundary , dislocation , deformation mechanism , microstructure , compression (physics) , composite material , metallurgy , crystallography , creep , chemistry , medicine
The high‐temperature deformation of hypostoichiometric 239 PuO 2 was investigated using constant‐displacement‐rate compression tests. Considerable ductility (10 to 25% true strain) was observed at 800° to 1500°C. Yield stresses decreased with increasing temperature and decreasing strain rate. Strain‐rate sensitivity values increased from 0.011 at 800° to 0.205 at 1500°C, whereas deformation activation energies were 121 to 157 kcal/mol. Deformed microstructures showed no evidence of grain‐boundary cracking, suggesting that dislocation motion is the dominant high‐temperature deformation mechanism.