SYMPOSIA PAPER Published: 01 January 1967
STP41321S

Gas Release and Compression Properties in Beryllium Irradiated at 600 and 750 C

Source

Helium released from beryllium irradiated at 600 and 750 C was measured and related to a macro-diffusion coefficient, D. The value of D at 600 C was 6.8 x 10-14 and at 750 C was 1.13 x 10-9 cm2Vsec. The magnitude of the macro-diffusion coefficient at 750 C agrees with that predicted for gas diffusion in beryllium, but that at 600 C agrees better with self-diffusion coefficient. The activation energy, G, for release of helium in the equation D = D0 exp - G/kT is then 5 ev, which corresponds to the activation energy for re-solution processes. The recoil mechanism for helium release was considered and shown to be small where appreciable gas was released from the specimens. The microstructure of the beryllium showed larger gas bubble formation in the grain boundaries than within the grains. The compression yield strength of the beryllium irradiated at 1 × 1021 neutrons (n)/cm2 E > 1 Mev at these temperatures increased only slightly, and the ultimate compression strength decreased, although appreciable plastic deformation was sustained in the compression testing.

Author Information

Beeston, J., M.
Idaho Nuclear Corp., Idaho Falls, Idaho
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E10
Pages: 135–148
DOI: 10.1520/STP41321S
ISBN-EB: 978-0-8031-6024-8
ISBN-13: 978-0-8031-6178-8