Fabrication of Niobium sheet for RF cavities

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Title: Fabrication of Niobium sheet for RF cavities
Author: Balachandran, Shreyas
Abstract: This thesis investigated the microstructure and mechanical property of RRR ( high purity ) and RG (low purity ) niobium (Nb ) sheet material . RRR Nb is used in the fabrication RF cavities . Our method involves processing bulk niobium by equal channel angular extrusion (ECAE ) and then cross rolling to obtain sheets . This work is a study of the effect different thermomechanical processing variables have on the microstructure niobium sheets . Recrystallization behaviors strongly depended on the purity levels . Tensile tests on sheets clearly indicated the anisotropy in the sheet material . The ductility of the sheet was found to be the largest at an angle of 45o to the rolling direction . There was no apparent relationship observed in the yielding behavior in the different samples . The formability of the sheet measured by the anisotropy ratio suggested a strong dependence of anisotropy on texture . Texture results obtained show that different routes of ECAE can lead to variety of textures in final sheet material . Correlations between the microstructure and the ECAE routes suggest that effective control of microstructure is possible by the thermomechanical steps followed in this study .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2347
Date: 2009-05-15

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Fabrication of Niobium sheet for RF cavities. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2347 .

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