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Submitted on 1 Jan 1980
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DEFECTS AND PHASES OF IRON IN ALUMINIUM
S. Nasu, U. Gonser, R. Preston
To cite this version:
S. Nasu, U. Gonser, R. Preston. DEFECTS AND PHASES OF IRON IN ALUMINIUM. Journal de
Physique Colloques, 1980, 41 (C1), pp.C1-385-C1-386. �10.1051/jphyscol:19801147�. �jpa-00219632�
JOURNAL DE PHYSIQUE Colloque Cl
,
supplkment au n O 1, Tome 41, janvier 1980, page C1-385DEFECTS
AND
PHASES OF 1 RON IN ALUMINIUMS. Nasu, U. Gonser and R.S. prestone
Fachbereich Angewandte Physik, Universittit des saarlandes, 6600 Sambrilcken, Germmy.
a Physics Department, Northern IZZinois University, DekaZb, 111. 60115, USA.
I n p h y s i c a l m e t a l l u r g y t h e knowledge o f Most s u i t a b l e t o d e m o n s t r a t e t h i s f a c t i s d e f e c t s and p h a s e s i s of g r e a t importance. t h e system A1-Fe where t h e 5 7 ~ e c o n c e n t r a - I n r e c e n t y e a r s by 5 7 ~ e Miissbauer s p e c t r o - tion c a n be a s low a s 0.001 a t . % .
scopy s i g n i f i c a n t c o n t r i b u t i o n s were made.
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Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19801147
cl-386 JOURNAL DE PHYSIQUE
Because o f s p a c e l i m i t a t i o n t h e work and i n f o r m a t i o n o b t a i n e d i n t h e s y s t e m A1-Fe i s summarized i n t a b l e 1 .
I A
g e n e r a l , i n t h e c a s e of d e f e c t s t h e 5 7 ~ e atom i s a s s o - c i a t e d w i t h o r i n c l o s e p r o x i m i t y t o a p a r t i c u l a r d e f e c t (vacancy, i n t e r s t i t i a l , g r a i n boundary, c l u s t e r , a n t i -domain boun- d a r y ) a s s c h e m a t i c a l l y shown. The o b s e r v e d e f f e c t s c o n s i s t . m o s t l y of s a t e l l i t e l i n e s a s i n d i c a t e d . U n f o r t u n a t e l y , t h e isomer s h i f t v a l u e s and q u a d r u p o l e s p l i t t i n g s a r e d i s t r i b u t e d i n r a t h e r narrow v e l o c i t y r a n - g e s . Thus, i t seems i m p o r t a n t t h a t t h e de- f e c t one i s s t u d y i n g i s p r e s e n t a s a l a r g e f r a c t i o n i n t h e t o t a l s p e c t r u m . Computer programs have b e e n w r i t t e n i n o r d e r t o eva- l u a t e o v e r l a p p e d s p e c t r a .Of p a r t i c u l a r i n t e r e s t i s t h e work by Man- s e l and vog18. S p e c i f i c c o n f i g u r a t i o n s and v i b r a t i o n a l modes o f 5 7 ~ o , 5 7 ~ e w i t h i n t e r - s t i t i a l ~ c o u l d b e , e v a l u a t e d . R e c e n t l y we r e p o r t e d on Fe vacancy a s s o c i a t i o n s 7 . The v a c a n c i e s were produced by p l a s t i c deforma- t i o n . S e v e r a l s t a g e s of r e c o v e r y p r o c e s s e s c o u l d be r e c o g n i z e d , f o r i n s t a n c e t h e t r a p - p i n g and d e t r a p p i n g of v a c a n c i e s by 5 7 ~ e i m p u r i t i e s . T h i s work has been e x t e n d e d by i s o c h r o n a l a n n e a l i n g t o h i g h e r t e m p e r a t u - r e s . New s a t e l l i t e l i n e s were o b s e r v e d i n - d i c a t i n g 5 7 ~ e a s s o c i a t i o n s w i t h d i s l o c a t i - ons and g r a i n b o u n d a r i e s . Specimens w i t h 11 p;m 5 7 ~ e i n A l , c o l d r o l l e d a t 77 K and a n n e r l e d f o r 100 m i n u t e s a t 8 0 ' ~ a l s o show s i m i l a r s a t e l l i t e l i n e s . One might e x p e c t d i f f e r e n c e s i n h y p e r f i n e p a r a m e t e r s from s i n g l e d i s l o c a t i o n (edge o r s c r e w ) , sub- b o u n d a r i e s ( r e g u l a r a r r a y of d i s l o c a t i o n s ) and s e v e r a l k i n d s o f g r a i n b o u n d a r i e s . How- e v e r , t h e l a c k o f r e s o l u t i o n makes t h i s work r a t h e r d i f f i c u l t .
The p h a s e s (A16Fe, A l I 3 F e 4 , A15Fe2, AlFe) w i t h t h e i r r e l e v a n t Mossbauer p a r a m e t e r s
and r e f e r e n c e s i n t h e t a b l e a r e w e l l e s t a - b l i s h e d . The m a g n e t i c p h a s e Fe3A1 h a s been n e g l e c t e d . The m e t a s t a b l e A16Fe p h a s e i s o f t e n o b s e r v e d i n t h e s o l i d i f i c a t i o n p r o - c e s s and Mossbauer s p e c t r o s c o p y i s u s e f u l t o f o l l o w t h e t r a n s f o r m a t i o n t o t h e e q u i - l i b r i u m AIl3Fe4 p h a s e .
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P h i l . Mag.
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(1977) 13676 . S a s s a , K . , Goto, H . , I s h i d a , Y . , Kato, M . ,
S c r i p t a Met.
11,
(1977) 10297. P r e s t o n , R.S., Nasu, S., Gonser, U., J . de Phys. C Z , (1979) 564
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(1977) 253 and r e f e r e n c e s t h e r e i n9. Vogl, G . , Mansel, W . , D e d e r i c h s , P.H., Phys. Rev. L e t t e r s
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(1976) 1497 1 0 . Nasu, S . , Gonser, U . , G l e i t e r , H . ,u n p u b l i s h e d
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(1971) 2031 12. Nasu, S . , Gonser, U . ,P r o c e e d i n g Mossbauer Conference, Bra- t i s l a v a , p . 311
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