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Plastic Deformation in Alumina by Explosive Shock Loading
Author(s) -
BEAUCHAMP E.K.,
CARR M. J.,
GRAHAM R.A.
Publication year - 1985
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.1151-2916.1985.tb10127.x
Subject(s) - explosive material , materials science , crystal twinning , dislocation , shock (circulatory) , composite material , deformation (meteorology) , transmission electron microscopy , adiabatic process , shock wave , metallurgy , mineralogy , microstructure , thermodynamics , chemistry , nanotechnology , medicine , physics , organic chemistry
Spherical alumina powder, composed of α‐Al 2 O 3 and transitional alumina phases, was compacted by explosive shock loading with maximum pressures of 13 to 26 GPa and a maximum adiabatic temperature rise of ∼400°C. A final density >90% of theoretical was achieved. The powder densified primarily by plastic deformation, with only occasional particle fracture. Transmission electron microscopy showed dislocation densities of at least 10 11 cm −2 in all phases and extensive twinning in transitional alumina phases.