SURFACE DAMAGE IN BERYLLIUM
Journal Article
·
· Am. Soc. Metals, Trans. Quart.
OSTI ID:4740644
The nature and effects of surface damage in hot-pressed, hot-rolled, and hot-upset beryllium sheet were investigated. Metallographic examination showed that surface damage in as-received sheet and in sheet with ground surfaces consisted of twins and cracks. Annealing to remove twins and relieve residual stresses resulted in sharp increases in ductility for all types of sheet, as indicated by tensile, bend, and impact tests. In some cases, etching after annealing produced further increases in properties. Electron diffraction studies revealed the presence of a thin layer of basal planes oriented parallel to the surface of ground samples. The poor ductility in machined beryllium was attributed to highly twinned areas acting as the favored loci for crack formati on. Cracks did not appear to be as detrimental as twins. (auth)
- Research Organization:
- Lockheed Missiles and Space Co., Palo Alto, Calif.
- NSA Number:
- NSA-17-004937
- OSTI ID:
- 4740644
- Journal Information:
- Am. Soc. Metals, Trans. Quart., Journal Name: Am. Soc. Metals, Trans. Quart. Vol. Vol: 55
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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