DEVELOPMENT OF VERY HIGH STRENGTH BERYLLIUM WIRE.
Abstract
The beryllium-iron alloys could not be deformed at temperatures used for the warm drawing technique. It was found that the 2% copper level gives improved mechanical properties to extruded forms over the 5% copper level. Both copper beryllium alloys showed very poor strain hardening characteristics during the warm drawing operation. The drawability of the fine grained materials from the same starting material was found to decrease with decreased grain size with increased oxide content. A 15% increase in tensile strength with a substantial increase in wire ductility at 0.00477-inch diameter was shown for wire, as-drawn from 0.210-inch diameter, from starting material having -20 +10 micron particle size. Similar strength levels with excellent ductility were obtained with high purity -15 +1 electrorefined material at wire sizes of 0.001278-inch diameter. A 25% increase in tensile strength was obtained after pickling. The data suggest that the optimum tensile strength for wrought beryllium wire would occur at some narrow fractional cut with the minimum particle size well over 1 micron at a high purity level. This would permit maximum work hardenability while still retaining grain size control. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 07, 1964
- Accession Number
- AD0610316
Entities
People
- E. A. Murphy
- R. G. O'rourke