FABRICATION AND PROPERTIES OF TUNGSTEN SINGLE CRYSTALS
Abstract
A new set of master seeds were prepared similarly to those used in the previous program. Ten tungsten crystals were grown by the arc-verneuil process from which three were selected on the basis of minimum crystal misorientation and deviation from cylindrical axis. The three crystals selected were machined to form rectangular billets to allow uniform deformation and crystallographic rolling plane and rolling direction to be within the desired limits. The program is designed to illustrate both the ability and the feasibility of fabricating a large single crystal into sheet. Subsequent roll- anneal cycles will be used which retain monocrystallinity and thus the inherently low ductile-to-brittle transition temperature of tungsten single crystals. The previous program has illustrated the possibility of such an approach. This program is concerned with rigorously defining the variables which influence recrystallization of a tungsten single crystal in hopes to control and best utilize the variables in order to allow more flexibility in processing. The substructural changes accompanying the processing will then be observed and the effect of these changes on the ductile-tobrittle transition temperature recorded.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 28, 1964
- Accession Number
- AD0600904
Entities
People
- F. R. Charvat
- G. W. Edwards