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Additional info for Metallurgy Division - [quarterly rpt Jul-Sep 1953] [declassified]
14441 Bright Field ...................... .. .. .. ............ .. Micro 0 0 0 0 0 Bright Field 0 000 0 0 00 0 0 0 0 0 0 0 0 0 0 100-X 1000-X 61 - Annealing f o r 2 4 Hours at 5OO0C, (Figure 2 3 ) The slight activity that was noted around the inclusions at 35OoC h a s now p r o g r e s s e d sufficiently to r e v e a l general decomposition of the m a t r i x , (Figure 23-b). The nature of the inclusions a p p e a r s to be unchanged. The original grain bounda r y outlines a r e still evident (Figure 2 3 - c ) , but on continued electropolishing they a r e masked by the fine precipitate.
A s p e c i a l mass spectrographic a n a l y s i s w a s made for t h o r i u m in u r a n i u m melted in t h o r i a c r u c i b l e s , and the value reported was 2 ppm thorium. The high purity b i l l e t s contained 23 ppm carbon and l e s s than 10 ppm nitrogen. Na difference w a s found metallographically o r in analysis between billets melted in 15 minutes o r 4 hours. The amount of skull in the crucible w a s about 5 % of the c r y s t a l s charged. The production of l a r g e , high purity b i l l e t s h a s been demonstrated and i s limited mainly by the amount of electrolytic crystals available.
59 - Figure 21. Microstructures of As Quenched U-3 w/o Nb Alloy. 21-a. Mechanically Polished. 21-b. I I t Micro #14355 Bright Field 21-c. 0-X 5 Minute Electropolish. Micro #14356 Bright Field 21-d. 1000-X 10 Minute Electropolish. x Micro #14357 Bright Field 75-X Micro #14348 Bright Field 100-X # ....................... .. .. .. ............. .. : I Figure 22. i 22-a. 60 Microstructure of U-3 w/o Nb Alloy After Annealing for 84 Hours a t 350°C. Mechanically Polished. 5 Second Electropolish.
Metallurgy Division - [quarterly rpt Jul-Sep 1953] [declassified]