Grain size and oxide content affect beryllium's properties
- Naval Air Development Center, Warminster, PA
The structure and mechanical properties of high purity beryllium powders, consolidated by hot isostatic pressing, has been determined for powders of -44 ..mu..m and finer. The combination of high purity (that is, absence of agglomerated-producing impurities) and hot isopressing (that is, low consolidation temperatures) has produced beryllium metal with up to 7 percent tensile elongation at average yield strengths of 205 to 275 MPa (30 to 40 ksi) and with elongation as great as 6.5 percent at yield strengths of 380 to 450 MPa (55 to 65 ksi). The structure of hot isopressed, high purity beryllium had a fine grain size stabilized with a fine grain boundary dispersion of beryllium oxide. Little grain growth was observed with isopressed material with heat treatments as high as 1230/sup 0/C (2250/sup 0/F). Extruded and hot cross-rolled material also exhibits excellent strength, but recrystallized in a more normal manner. Yield and tensile strength vs grain size follow normal Petch type behavior. A model is proposed to account for the effect of increased BeO content on the strength and ductility of beryllium. 5 figures, 6 tables.
- OSTI ID:
- 7339154
- Journal Information:
- Met. Eng. Q.; (United States), Journal Name: Met. Eng. Q.; (United States) Vol. 16:4; ISSN MENQA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
BERYLLIUM
BERYLLIUM COMPOUNDS
BERYLLIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
ELONGATION
FABRICATION
GRAIN SIZE
HOT PRESSING
MATERIALS WORKING
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PRESSING
SIZE
TENSILE PROPERTIES
YIELD STRENGTH