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Submitted on 1 Jan 1985
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STRUCTURAL ANISOTROPY OF AMORPHOUS
ALLOYS INDUCED BY MECHANICAL CREEP
DEFORMATION
Y. Suzuki, J. Haimovich, T. Egami
To cite this version:
Résumé - L'anisotropie structurale d'un alliage amorphe due au fluage a été observée pour la première fois par diffraction X
(méthode de la dispersion en énergie). Cette anisotropie vient uniquement de la polarisation inélastique et disparaît par recuit sous tension nulle. L'écoulement plastique ne fait apparaître aucune anisotropie de structure.
JOURNAL DE PHYSIQUE
Colioque C8, supplement au n°12, Tome 46, decembre 1985 page C8-623
STRUCTURAL ANISOTROPY OF AMORPHOUS ALLOYS INDUCED BY MECHANICAL CREEP DEFORMATION
Y. Suzuki , J . Haimovich and T. Egami
Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania,
Philadelphia, PA 19104, U.S.A. A b s t r a c t - We p r e s e n t t h e f i r s t e v i d e n c e of t h e s t r u c t u r a l a n i s o t r o p y of an amorphous a l l o y due t o c r e e p d e f o r m a t i o n , d e t e c t e d by e n e r g y d i s p e r s i v e x - r a y d i f f r a c t i o n . The a n i s o t r o p y i s due s o l e l y t o t h e a n e l a s t i c p o l a r i z a t i o n and d i s a p p e a r s a f t e r z e r o - s t r e s s a n n e a l i n g . The p l a s t i c f l o w l e a v e s no s t r u c t u r a l a n i s o t r o p y b e h i n d . I - INTRODUCTION
Amorphous alloys show considerable anelasticity and plasticity [1], but the microscopic mechanism of deformation still remains poorly under-stood. One of the reasons for this difficulty is that the traditional methods to observe microstructure of solids, such as transmission
elec-tron microscopy (TEM), are nearly powerless for amorphous materials. However, microscopic structural changes due to mechanical deformation could be detected by other more macroscopic probes as long as the probe has a high accuracy. In our study we used the energy dispersive x-ray diffraction (EDXD) technique [2] to detect the structural anisotropy induced by mechanical creep deformation.
I I - EXPERIMENTAL METHODS T h e s a m p l e s u s e d i n t h i s s t u d y a r e a m o r p h o u s F e 4 o N i 4 o M o 3 S i ^ 2B5 ( V i t r o v a c - 4 0 4 0 ) p r o d u c e d b y V a c u u m s c h m e l z e a n d p r o v i d e d b y D r . H. R. H i l z i n g e r . The d i m e n s i o n of t h e s a m p l e w a s 3 5 um x 15 mm x 7 0 mm. T h e s a m p l e w a s a n n e a l e d u n d e r t h e t e n s i l e s t r e s s o f 8 0 0 MPa, w h i c h i s a b o u t 1 / 4 t o 1 / 3 o f t h e f r a c t u r e s t r e s s , a t 3 0 0 ° C f o r 2 4 h r s i n v a c u u m o f 1 0 5 t o r r . U s u a l l y a n o t h e r p i e c e o f r i b b o n w a s a n n e a l e d s i m u l t a n -e o u s l y b u t w i t h o u t t h -e a p p l i -e d s t r -e s s , a n d w a s u s -e d a s t h -e c o n t r o l s a m p l e . T h e t o t a l e l o n g a t i o n o f t h e s a m p l e i s a b o u t 3%, o n e t h i r d o f w h i c h i s a n e l a s t i c . P r e s e n t a d d r e s s : C e n t r a l R e s e a r c h L a b o r a t o r y , H i t a c h i C o r p . , Tokyo, J a p a n . P r e s e n t a d d r e s s : AMP I n c . , H a r r i s b u r g , P e n n s y l v a n i a , U.S.A.
C8-624 JOURNAL DE
