Hot-pressing of shock-activated aluminum nitride

Journal Article · Wed Dec 31 23:00:00 EST 1986 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1987.tb00058.x· OSTI ID:6173793

Beauchamp, E K; Carr, M J; Graham, R A ^[1]

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1. Sandia National Labs., Albuquerque, NM (USA)

Aluminum nitride powders were subjected to explosive shock treatment at 17 and 22 GPa and then hot-pressed. The ram pressure required to obtain equivalent densification behavior in hot-pressing was 16 MPa lower in shocked powders than in unshocked powders in the pressure regime in which deformation is attributed to dislocation motion. Transmission electron microscopy on hot-pressed samples confirmed that dislocation processes were active in both shocked and unshocked powders. The higher densification rates in shocked material are related to dynamic recrystallization which is promoted by the high dislocation densities and results in enhanced dislocation motion.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6173793
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 2:1; ISSN 0883-5551; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FABRICATION
HOT PRESSING
INFORMATION
LATTICE PARAMETERS
MATERIALS WORKING
MICROSCOPY
NITRIDES
NITROGEN COMPOUNDS
NUMERICAL DATA
PNICTIDES
PRESSING
SHOCK WAVES
TRANSMISSION ELECTRON MICROSCOPY
VERY HIGH PRESSURE