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High‐Temperature Plastic Deformation of Polycrystalline Beryllium Oxide
Author(s) -
BARMORE WILLIS L.,
VANDERVOORT RICHARD R.
Publication year - 1965
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.1151-2916.1965.tb14648.x
Subject(s) - creep , materials science , deformation (meteorology) , composite material , beryllium oxide , diffusion creep , beryllium , crystallite , compression (physics) , tension (geology) , activation energy , deformation mechanism , oxide , stress (linguistics) , grain boundary , metallurgy , microstructure , chemistry , organic chemistry , linguistics , philosophy
High‐density specimens were plastically deformed under four‐point transverse bending. Tests were conducted in vacuum in the region 1400° to 1700°C under stresses of 1000 to 4500 psi. The activation energy for creep was 99.0 kcal/mole. Creep rate was directly proportional to the applied stress and inversely proportional to the square of the grain diameter. The deformation behavior is ascribed to a Nabarro‐Herring type mechanism. Results show that creep was the same in tension and compression.