BERYLLIUM RESEARCH AND DEVELOPMEENT PROGRAM
Rept. for 17 Jun 1959-1 Oct 1963
TEXTRON INC WEST CONCORD MA NUCLEAR METALS DIV
Pagination or Media Count:
The projects reported in this volume are primarily conccnooncerned with effects of grain size and purity of beryllium. Section II describes the efforts to produce the purest beryllium possible by double vacuum distillation. The distilled beryllium when converted to powder and subsequently extruded exhibited greater bend ductility than any of the other forms of less pure beryllium utilized in the evaluation. In Section III, the work involves the evaluation of the ductility and critical resolved shear stress for basal slip of cast single crystals of Pechiniiney SR grade and single distilled seed beryllium. The data were compared with previous work on cast commercial grade and zone-refined single crystals. Sections IV and V were aimed at achieving finer grain size powder, while minimizing contamination, than had ever been produced. In Section IV, the powder of particle sizes less than 5 microns was produced by improved attritioning methods. Section V reports the attainment of powder sizes of approximately 300 angstroms by evaporation and condensation. Section VI was concerned with the conssolidation and evaluation of powders produced in Section V. The hot pressed powder had exceptionally high hardness and was very brittle, prohibiting the preparation of mechanical test specimens.
- Inorganic Chemistry
- Metallurgy and Metallography