Grain size and oxide content affect beryllium's properties

Journal Article · Mon Nov 01 00:00:00 EST 1976 · Met. Eng. Q.; (United States)

OSTI ID:7339154

London, G J ^[1]; Keith, G H; Pinto, N P

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1. 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), Vol. 16:4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BERYLLIUM
TENSILE PROPERTIES
BERYLLIUM OXIDES
ELONGATION
GRAIN SIZE
HOT PRESSING
YIELD STRENGTH
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
BERYLLIUM COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
MATERIALS WORKING
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PRESSING
SIZE
360103* - Metals & Alloys- Mechanical Properties