Relationships between deformation and microstructure evolution and minimizing surface roughness after BCP processing in RRR Nb cavitites

Bieler, T.R. ; Baars, D. ; Hartwig, K.T. ; Compton, C. ; Grimm, T.L.

Michigan State University

关键词: Extrusion;    Processing;    Cavities;    Roughness;    99 General And Miscellaneous;   

DOI  :  10.2172/953204
RP-ID  :  Final Report
RP-ID  :  FG02-06ER41433
RP-ID  :  953204

美国|英语

来源: UNT Digital Library

【 摘 要 】

Two strategies for improving the surface finish of niobium sheet used in superconducting radio frequency cavities were examined, using slices of single (or large-grain) material from an ingot, and equal channel angle extrusion (ECAE) preprocessing of ingot material to achieve a uniform and small grain size prior to subsequent rolling. The effect of these two processing paths on final microstructure, texture, and surface finish are discussed.