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Title:
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Fabrication of Niobium sheet for RF cavities |
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Author:
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Balachandran, Shreyas |
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Description:
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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 . |
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URI:
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http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2347
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Date:
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2013-03-12 |
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