| dc.contributor |
Griffin , Richard B |
|
| dc.creator |
Balachandran , Shreyas |
|
| dc.date |
2010 -01 -15T00 :03 :47Z |
|
| dc.date |
2010 -01 -16T00 :28 :23Z |
|
| dc.date |
2010 -01 -15T00 :03 :47Z |
|
| dc.date |
2010 -01 -16T00 :28 :23Z |
|
| dc.date |
2008 -12 |
|
| dc.date |
2009 -05 -15 |
|
| dc.date.accessioned |
2013 -03 -12T17 :49 :47Z |
|
| dc.date.available |
2013 -03 -12T17 :49 :47Z |
|
| dc.date.issued |
2013 -03 -12 |
|
| dc.identifier |
http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2347 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2347 |
|
| dc.description |
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 . |
|
| dc.format |
electronic |
|
| dc.format |
application /pdf |
|
| dc.format |
born digital |
|
| dc.language |
en _US |
|
| dc.subject |
ECAE |
|
| dc.subject |
RF cavity |
|
| dc.subject |
Texture |
|
| dc.subject |
Rolling |
|
| dc.title |
Fabrication of Niobium sheet for RF cavities |
|
| dc.type |
Book |
|
| dc.type |
Thesis |
|
| dc.type |
Electronic Thesis |
|
| dc.type |
text |
|