Mechanical Properties of High RRR Niobium With Different Texture

Author

Jiang, H. ; Baars, D. ; Zamiri, A. ; Antonie, C. ; Bauer, P. ; Bieler, T.R. ; Pourboghrat, F. ; Compton, C. ; Grimm, T.L.

Author_Institution

Michigan State Univ., East Lansing

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

1291

Lastpage

1294

Abstract

High purity bulk niobium RRR ~ 300 is the standard material used for SRF cavities since this has been the most promising material for over 10 years. Mechanical properties of the high RRR niobium play a critical role in the physical integrity of these structures. It is well known that the mechanical properties of polycrystalline high RRR niobium are affected by a variety of possible contributors: crystallographic texture, grain size, and impurity concentration. Tensile tests were carried out using three groups of niobium samples from MSU SRF cavity and Fermi International Linear Collider projects with different texture and grain size, which came from two different manufacturers. For some of the groups the tensile tests were done with different orientations with respect to the sheet. Orientation Imaging Microscopy (OIM) data were collected in these samples. The relationships between mechanical properties, texture, and grain size in these samples are analyzed.

Keywords

elongation; niobium; tensile strength; tensile testing; work hardening; Nb - Surface; SRF cavities; crystallographic texture; grain size; high RRR niobium; impurity concentration; orientation imaging microscopy; tensile testing; Crystalline materials; Crystallography; Grain size; Image texture analysis; Impurities; Manufacturing; Mechanical factors; Microscopy; Niobium; Testing; High purity niobium; SRF cavity; mechanical properties; texture;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.898463

Filename

4277476