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High‐Temperature Steady‐State Creep in Rutile
Author(s) -
HIRTHE WALTER M.,
BRlTTAIN JOHN O.
Publication year - 1963
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.1151-2916.1963.tb11767.x
Subject(s) - creep , materials science , rutile , activation energy , strain rate , stoichiometry , atmospheric temperature range , hydrogen , thermodynamics , composite material , chemistry , physics , organic chemistry
The primary objective of this research was to study the interaction of point defects and dislocations in rutile at elevated temperatures. The steady‐state creep rate was obtained for near‐stoichiometric and vacuum‐reduced compression specimens in the range 1050° to 1325°K and for stresses from 2(10 8 ) to 9(10 8 ) dynes per cm 2 . For a constant stress, strain, and temperature, the activation energy for creep varies continuously from 67 kcal per mole for the near‐stoichiometric condition to about 33 kcal per mole for the highest degree of reduction. The activation energy for creep in hydrogen‐reduced rutile is about 80 kcal per mole and this leads to the conclusion that the rate‐controlling mechanism and/or defect are not the same for hydrogen‐ and vacuum‐reduced rutile. A model based on the interaction of piled‐up dislocations on a single slip system and high‐density polygon walls formed during creep is proposed to explain steady‐state creep in rutile.