FISSION-FRAGMENT-INDUCED EXPANSION IN SINGLE-CRYSTAL ALPHA ALUMINA

Technical Report · Sun Sep 01 04:00:00 EDT 1963

OSTI ID:4659243

Elleman, T S; Price, R B; Sunderman, D N

Fission fragments were recoiled into flat Al/sub 2/O/sub 3/ specimens, and the height of the expansion step formed at the boundary between irradiated and unirradiated regions of the surface was measured by interferometry techniques. Expansion normal to the surface was found to be independent of crystal orientation for specimens cut along three different axes. Expansion was not a linear function of fission-fragment concentration as a factor of ten increase in exposure produced only a factor of three increase norimal to the specimen surface were at least three times larger than expansion coefficients calculated from the bending moment of thin, fission-fragment-irradiated Al/sub 2/O/sub 3/ disks. This result indicates that fission-fragment-induced expansion is not isotropic but that the stresses are preferentially relieved by expansion normal to the free surface. (auth)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• DOE Contract Number: W-7405-ENG-92
• NSA Number: NSA-17-037564
• OSTI ID: 4659243
• Report Number(s): BMI-1646
• Country of Publication: United States
• Language: English

Related Subjects

ALUMINUM OXIDES
ANISOTROPY
CRYSTALS
EXPANSION
IRRADIATION
LATTICES
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MONOCRYSTALS
PLATES
RADIATION EFFECTS
RECOILS
SPECTRA
STRESSES
SURFACES