Grain refinement of electron-beam-melted crystal bar zirconium by equal channel angular extrusion
- David J.
- Carl T.
- David A.
Electrowbeam (EB) melted crystal bar zirconium has a very low oxygen content (approximately 100 ppm by weight), but a coarse grain structure that needs to be refined to allow successfbl part fabrication by conventional methods. Cylindrical rods were sectioned fiom an EB-melted billet by electrodischarge machining, and enclosed in seamless nickel tubing by electron beam welding plugs ia each end to make a final billet 9.5 mm in diameter by 50 mm in length. The billet was deformcd by equal channel angular extrusion (ECAE) at room temperature in 120{sup o} tooling. Mer extrusion for 4 passes via route B{sub e} the material was annealed in vacuum for 1 h at 550 C. Because of the low oxygen content, the Zr could be successfully deformed by ECAE to high strains at room temperature. The as-cast grains were extensively subdivided by the processing. A fine uniform grain size of approximately 10 microns was achieved after the anneal, with a weak texture of only 2-3 times random.
- Research Organization:
- Los Alamos National Laboratory
- Sponsoring Organization:
- DOE
- OSTI ID:
- 977386
- Report Number(s):
- LA-UR-03-9260
- Country of Publication:
- United States
- Language:
- English
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