Diffusion and interface control of reactions in alloys
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Diffusion and Interface Control of Reactions in Alloys
MATS H I L L E R T R. F . M e h l M e d a l i s t
B y a p p l y i n g t h e l o c a l e q u i l i b r i u m c o n c e p t to m o v i n g i n t e r f a c e s , it h a s b e e n p o s s i b l e t o t r e a t t h e r a t e of r e a c t i o n s in a l l o y s a s c o n t r o l l e d b y d i f f u s i o n . V a r i o u s t y p e s of t r a n s f o r m a t i o n s have b e e n e x a m i n e d o v e r the y e a r s and s a t i s f a c t o r y a g r e e m e n t b e t w e e n t h e o r y a n d e x p e r i m e n t h a v e o f t e n b e e n f o u n d . In r e c e n t y e a r s , t h e r e h a s b e e n a n i n c r e a s i n g i n t e r e s t in r e a c t i o n s w h e r e l o c a l e q u i l i b r i u m i s n o t n e c e s s a r i l y e s t a b l i s h e d at t h e m o v i n g i n t e r f a c e . Such c a s e s a r e e x a m i n e d a n d c o m p a r e d . T h e t r a n s i t i o n b e t w e e n d i f f u s i o n c o n t r o l and i n t e r f a c e c o n t r o l is d i s c u s s e d .
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t h e 1961 Howe M e m o r i a l L e c t u r e , D r . D a r k e n 1 s p o k e a b o u t t h e r o l e of c h e m i s t r y in m e t a l l u r g i c a l r e s e a r c h . He c o v e r e d a w i d e r a n g e of p h e n o m e n a , b u t p a i d p a r t i c u l a r a t t e n t i o n t o t h e k i n e t i c s of p h a s e t r a n s -
formations and discussed the model for two extreme c a s e s . In t h e l o c a l e q u i l i b r i u m m o d e l 2 o n e a s s u m e s t h a t t h e c o m p o s i t i o n s of t w o p h a s e s in c o n t a c t w i t h e a c h o t h e r a r e s u c h t h a t t h e y a r e in c h e m i c a l e q u i l i b -
The Institute o f Metals Lecture was established in 1921, at which time the Institute o f Metals Division was the only professional Division within the American Institute o f Mining and Metallurgical Engineers. It has been given annually since 1922 by distinguished men from this country and abroad. Beginning in 1973 and thereafter, the person selected to deliver the lecture will be known as the "Institute o f Metals Division Lecturer and R. F. Mehl Medalist"for that year.
graduate studieswere conductedat the MassachusettsInstitute of Technology, where he receivedhis Doctorate of Sciencein the field of physicalmetallurgyin 1956 with a thesison nucleation and spinodaldecomposition. From 1948 to 1953 he did researchwork at the SwedishInstitute for Metal Researchin Stockholmwhere he studiedphysicalmetallurgy.After completing his doctoralrequirements,Dr. HiUertreturned to the SwedishInstitute for Metals Researchin 1956 and becamea Professorof PhysicalMetallurgyat the Royal Institute of Technology.
MATSHILLERT has been a Professorof PhysicalMetallurgyat the Royal Institute of Technology in Stockholm since 1961. Dr. Hillertreceivedhis bachelor degree in chemicalengineeringat ChalmersTechnicalUniversityin 1947. His METALLURGICAL TRANSACTIONS A
VOLUME 6A, JANUARY 1975-5
r i u m with each other. The c o m p o s i t i o n s m a y v a r y as one m o v e s f r
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