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Mechanical Properties of Fine‐Grained Magnesium Oxide at Large Compressive Strains
Author(s) -
CRAMPON J.,
ESCAIG B.
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.tb09860.x
Subject(s) - materials science , superplasticity , equiaxed crystals , grain size , crystallite , plasticity , magnesium , composite material , strain rate , metallurgy , deformation (meteorology) , strain hardening exponent , compression (physics) , microstructure
Fine‐grained polycrystalline MgO specimens were deformed in compression at constant strain rates of ∼6.7×10 −6 s −1 to 6.7×10 −5 s −1 at 1173 to 1423 K. Both mechanical data and microstructural observations are distinctive of a diffusion‐accommodated flow, where the grain‐size parameter is of prime importance in enhancing plasticity. Under suitable experimental conditions, superplastic strain was achieved in specimens; no change was detected in the equiaxed‐grain shape configuration. Finally, the effect of grain growth during deformation was considered; specimens of initial grain size ∼0.1 μm showed an apparent hardening which was quasi‐linear with time.