INVESTIGATION OF THE MECHANICAL CHARACTERISTICS OF ZONE-LEVELED BERYLLIUM.
Abstract
Zone-leveling has been shown to produce beryllium single crystals of intermediate purity, having moderately high basal glide capacity, while retaining reasonably high strength. Properties of the zone-leveled crystals are dependent upon zone travel rate, but not upon the number of zone passes. The enhanced basal glide corresponds to an agglomeration of insoluble impurities, and a retention of the soluble elements in solid solution. The process results in some bulk purification, but does not alter significantly the plastic anisotropy of the crystals. Application of the zone-leveling concepts, in a modified manner, to commercial hot-pressed polycrystalline metal has resulted in an improvement in roomtemperature tensile elongation, with only minor strength alterations. The implication of these results is that a refinement of the thermal and chemical parameters involved in the process could possibly lead to a materially improved engineering metal of available purity, thus precluding the high-purity approach. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0612696
Entities
People
- A. J. Stonehouse
- D. G. Fetsko
- J. A. Carrabine
- W. W. Beaver