Metallurgy Division - Semiannual Progress Rpt [Jan 31, 1952]

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I* :e-&& .................. . ..... .. -- 29 I... - ~- 0 0 0 - . -... _- ........ . I . 0 0 - . - 0 . ~ Fig. 22. L o n g i t u d i n a l S e c t i o n o f 1-in. - d i a Extruded T h o r i u m Rod . i n AsExtruded Condition Showing Deformed Grain Structure. Met. s p e c . 3 9 1 6 ; s a m p l e A-239-C2-40; e t c h e d w i t h a c e t i c - p e r c h l o r i c a c i d . 200X. - . 7. .. Fig. 23. -dia Extruded Thorium Rod in AsExtruded C o n d i t i o n S h o w i n g Completely R e c r y s t a l l i z e d 'Grain Structure.

FJ-340 p3&9 F i g . 1 2 . Hardness o f Thorium-Carbon A l l o y s A f t e r a Quench from 40OoC. ;: . . . . . :....... :: . . . ........................ . . . . . .. .. *. 4 CARBON ( WT 70) CARBON ( WT % ) 14 * DWG 14843 0.. * * * * . . FOR P E R I O D E N D I N G JANUARY 3 1 , 1952 .. Fig. 13. Hardness of As-Cast Thorium-Oxygen Alloys. - SECREl . -. C . - A eid Fig. 14. Hardness o f Thorium-Oxygen A l l o y After Homogenization at 9 5 O o C for 24 Hours. - . . *::: . . I2 . .

3 a t . o f z i r c o n i u m a t 955OC. The l i q u i d u s curve i n i t i a l l y r i s e s rapidly, with i n c r e a s i n g zirconium c o n t e n t , from the eutectic point a t 3 at. % of z i r c o n i u m and 955°C t o 5 . 4 a t . % o f z i r c o n i u m a t 105OOC. The l i q u i d u s c u r v e t h e n l e v e l s o f f and is r e m a r k a b l y f l a t i n t h e r e g i o n where t h e f i r s t i n t e r m e d i a t e p h a s e , AgZr, forms c o n g r u e n t l y f r o m t h e m e l t a t 1135OC.

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