A chemically stable electrode material in liquid iron
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WtPct Mg
At. Pct Mg
0 0.20 0.40 0.60 0.80 1.00 2.27
0 1.7 3.3 4.9 6.4 7.9 16.6
Liquidus,°C 323.5 318.8 312.8 307.5 297.5 287.3
Solidus,°C
-+ 1.0 -+0.2 + 0.2 + 2.0 + 1.5 -+ 1.5
Eutectic,°C
303.5 -+2 281.3 -+2 263.5 +-5 246.5 :t 1.5 245.8 - 1.0 248.0 -+ 1.0
4 . G. Horsley andJ. T. Maskrey: J. Inst. Metals, 1957-58,vol. 86, p . 446. 5. J. M. Eldridge, E. Miller, andK. L. Komarek: Trans. TMS-AIME, 1965, vol. 233, p. 1303. 6 . N. S. Kurnakow, S. A. Pogodin, andT. A. Vidusova: Isv. Inst. Fiz. -Khim. Anal. 1933, vol. 6 , p . 266;lzv. Sektora Fiz. -Khim. Anal., 1947, vol. 15, p . 74 (as quoted in M. Hausen andK. Anderko: Constitution o f Binary Alloys, p . 911, McGraw-Hill, N.Y., 1958). 7. A. Pasternak: Bull. Intern. Acad. Polon. Sci., Classe Sci. Math. Nat., vol. A1951, p . 177(quotedin M. Hansen andK. Anderko: Constitution o f Binary Alloys, p. 911, McGraw-Hill, N. Y., 1958).
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A Chemically Stable Electrode Material in Liquid Iron
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wt.% Mg in Pb
Fig. 2--The l e a d - r i c h end of the P b - M g p h a s e d i a g r a m , s h o w ing r e s u l t s of p r e v i o u s investigations a n d of p r e s e n t w o r k . e u t e c t i c f r e e z i n g p o i n t s a t 0.28 a n d 0.47 wt p c t M g shown in Fig. 2 f r o m t h e w o r k o f K u r n a k o v a n d S t e p ahOy 3 i n 1 9 0 5 . T o c i r c u m v e n t t h i s p r o b l e m i n t h e p r e s e n t w o r k , m e l t s of 0 . 2 , 0 . 4 , a n d 0 . 6 wt p c t M g w e r e frozen rapidly, with s t i r r i n g , and w e r e then c o l d f o r g e d to s h e e t s o f a b o u t 2 m m t h i c k n e s s . T h e s h e e t s w e r e c u t into s t r i p s a b o u t 1 c m w i d e , w h i c h w e r e w r a p p e d t i g h t l y a r o u n d the t h e r m o c o u p l e t u b e a n d r e i n s e r t e d i n the v a c u u m s y s t e m . T h e s a m p l e s w e r e h e a t e d r a p i d l y t o 250° + 10°C (the e u t e c t i c t e m p e r a t u r e ) a n d h e l d t h e r e f o r a t l e a s t 12 h r . T h e s a m p l e s were t h e n h e a t e d at a b o u t I°C p e r min a n d t h e t e m p e r a t u r e r e c o r d e d a t 30 s e c i n t e r v a l s . T h e s o l i d u s t e m p e r a t u r e w a s i n d i c a t e d by a d e c r e a s e i n the s l o p e o f t h e h e a t i n g c u r v e ; we b e l i e v e that the c o l d - f o r g i n g p l u s t h e annealing at 250°C h a d effectively r e m o v e d t h e segregation and produced a homogeneous s o l i d s o l u tion. T h e d a t a f o r t h e s o l i d u s p o i n t s a r e also g i v e n in T a b l e I a n d Fig. 2. T h e r e s u l t s put t h e s o l i d solubility l i m i t of m a g n e s i u m i n l e a d a t 0.7 + 0 . 1 wt p c t (6 + 1 a t . p c t ) M g (at t
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