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Extra resources for Eutectic Solidification Processing. Crystalline and Glassy Alloys

Example text

77-°c is the carbon potential in unalloyed F e - F e 3 C (after ref. 54) a n d M n a r e e l e c t r o n a c c e p t o r s , s t r o n g c a r b i d e s t a b i l i z e r s a n d d i s s o l v e in c e m e n t i t e substitutional^. 30. alloying with these elements are T h e y r e m o v e e l e c t r o n s f r o m t h e s- a n d d - b a n d s of F e , i n c r e a s i n g t h e d e n s i t y of d - e l e c t r o n s w i t h u n p a i r e d s p i n s a n d a l s o l o w e r t h e n u m b e r of NR-electrons in t h e s y s t e m .

8S i 8. 4 Fe4i. 5Ni 4 1. 27. 26 s h o w s , t h e effect of a n i n c r e a s e d 7 g / 7 , is t o l e n g t h e n t h e t i m e a t t h e n o s e of t h e T - T - T c u r v e a n d t o s h a r p e n a n d m o v e t h e n o s e t o s m a l l e r u n d e r c o o l ings. A s t h e G F A d e p e n d s o n 7 g / 7 b easy glass f o r m a t i o n s h o u l d b e associated with a l o w 7j w h i c h o c c u r s a t t h e e u t e c t i c c o m p o s i t i o n . 27 s h o w s t h a t a l l o y s w i t h 7 g / 7 , e x c e e d i n g 0 .

21 The variation of growth velocity with solute content of the solid phase (after ref. 17) interface a n d u n d e r n o r m a l equilibrium c o n d i t i o n s this c o m p o s i t i o n w o u l d follow t h e l i q u i d u s b u t , d u e t o t h e effect of i n t e r f a c e c u r v a t u r e , falls b e l o w it. T h e s o l u t e c o n t e n t in t h e s o l i d falls b e l o w t h e s o l i d u s f o r t h e s a m e r e a s o n . W h e n s o l i d i f i c a t i o n o c c u r s a t a c e r t a i n u n d e r c o o l i n g , d e v i a t i o n f r o m l o c a l e q u i l i b r i u m a t t h e i n t e r f a c e r e s u l t s in t h e s o l i d - p h a s e c o m p o s i t i o n a p p r o a c h i n g t h e s o l i d u s , c r o s s i n g i n t o t h e t w o - p h a s e field a n d d i f f u s i o n l e s s s o l i d i f i c a t i o n s u d d e n l y o c c u r s w h e n t h e a l l o y is u n d e r c o o l e d a critical a m o u n t b e l o w t h e TQ l i n e .

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