| Autor: |
Pugh, N. J., Evetts, J. E., Wallach, E. R. |
| Zdroj: |
Journal of Materials Science; June 1986, Vol. 21 Issue: 6 p1914-1918, 5p |
| Abstrakt: |
Transmission electron microscopy (TEM) has been used to characterize the microstructure of the Nb3Sn layers developed during heat treatment of two superconducting wires, with and without 0.8 wt% titanium addition to the niobium, manufactured by the modified jelly roll (MJR) process. The composites in the as-received state are shown to contain pre-reacted layers formed during fabrication anneals, while heat treatments over the range 650 to 750° C yield a two-fold layer structure of columnar and equiaxed grains. Examples of both transverse and longitudinal TEM micrographs are given. The addition of 0.8 wt% titanium to the niobium before fabrication leads to coarsening of the equiaxed grains after identical reaction times. The results are discussed in terms of a recently proposed model for the development of microstructure in A15 multifilamentary composites. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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