Diffusion of Nb and Sn in polycrystalline Nb sub 3 Sn

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5451344

Knox, R D; Wright, R N ^[1]

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1. Rensselaer Polytechnic Institute, Troy, NY (USA)

The diffusion coefficients of Nb and Sn in coarse grain size (60 {mu}m) and fine grain size (10 {mu}m) Nb{sub 3}Sn are being measured over the range from 900 to 1650 C. Radioactive tracer technique is being employed, using Nb{sup 94} and Sn{sup 113}. In the fine grained Nb{sub 3}Sn, the diffusion coefficients at 1640 C for Nb and Sn are 1.6 {times} 10{sup {minus}9} cm{sup 2}/sec {plus minus} 15% and 9.4 {times} 10{sup {minus}8} cm{sup 2}/sec {plus minus} 15%, respectively. The corresponding values for Nb and Sn in the coarse grained material are 7.1 {times} 10{sup {minus}10} cm{sup 2}/sec {plus minus} 15% and 2.8 {times} 10{sup {minus}9} cm{sup 2}/sec {plus minus} 15%, respectively. The values for Nb imply a lattice diffusivity of 5.3 {times} 10{sup {minus}10} cm{sup 2}/sec and a grain boundary diffusivity of 3.5 {times} 10{sup {minus}6} cm{sup 2}/sec. The diffusivities for Sn are inconsistent with simple concepts of grain boundary transport. These results are discussed with regard to diffusional flow and transformation kinetics in A15 compounds.

• OSTI ID: 5451344
• Report Number(s): CONF-840909--
• Conference Information: Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CRYSTAL STRUCTURE
CRYSTALS
DAYS LIVING RADIOISOTOPES
DIFFUSION
ELECTRON CAPTURE RADIOISOTOPES
EVEN-ODD NUCLEI
GRAIN BOUNDARIES
GRAIN SIZE
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
MICROSTRUCTURE
MINUTES LIVING RADIOISOTOPES
NIOBIUM 94
NIOBIUM ALLOYS
NIOBIUM ISOTOPES
NUCLEI
ODD-ODD NUCLEI
PERMEABILITY
PHASE TRANSFORMATIONS
POLYCRYSTALS
RADIOISOTOPES
SIZE
TEMPERATURE DEPENDENCE
TIN 113
TIN ALLOYS
TIN ISOTOPES
TRACER TECHNIQUES
YEARS LIVING RADIOISO