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DEPENDENCES OF THE ULTRASOUND VELOCITIES IN Fe40Ni40B6P14 METALLIC
GLASSES ON MAGNETIC BIAS FIELD AND HEAT TREATMENT NEAR CRYSTALLIZATION
TEMPERATURE
Z. Kaczkowski
To cite this version:
Z. Kaczkowski. DEPENDENCES OF THE ULTRASOUND VELOCITIES IN Fe40Ni40B6P14 METALLIC GLASSES ON MAGNETIC BIAS FIELD AND HEAT TREATMENT NEAR CRYS- TALLIZATION TEMPERATURE. Journal de Physique Colloques, 1990, 51 (C2), pp.C2-25-C2-28.
�10.1051/jphyscol:1990206�. �jpa-00230374�
COLLOQUE DE PHYSIQUE
Colloque C2, supplement au n02, Tome 51, FBvrier 1990 ler Congrds Fran~ais d'Acoustique 1990
DEPENDENCES OF THE ULTRASOUND VELOCITIES IN Fe40Ni40B,P,, METALLIC GLASSES ON MAGNETIC BIAS FIELD AND HEAT TREATMENT NEAR CRYSTALLIZATION TEMPERATURE
Z. KACZKOWSKI
Polish Academy of Sciences Institute of Physics, Al. Lotnikow 32/46,
PL-02-668 Warszawa, Poland
Abstract
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The u l t r a s o u n d v e l o c i t i e s a t c o n s t a n t m a g n e t i c f i e l d and a t c o n s t a n t m a g n e t i c i n d u c t i o n f o r as-quenched s t a t e and a f t e r h e a t t r e a - tment w e r e measured i n t h e Fe40Ni40B6P14 m e t a l l i c g l a s s e s . Observed c h a n g e s a r e c o n n e c t e d w i t h AE e f f e c t .The m a g n e t o s t r i c t i v e m e t a l l i c g l a s s e s , when h e a t t r e a t e d above C u r i e t e m p e r a - t u r e , e x h i b i t v e r y h i g h magnetomechanical c o u p l i n g and AE e f f e c t , e. g. [ I - 5 1 Fe-Ni-8-P m e t a l l i c g l a s s e s a r e t h e s o f t m a g n e t i c m a t e r i a l s w i t h v e r y low mag- n e t i c l o s s e s 161. The s a t u r a t i o n i n d u c t i o n
B,
of t h e Fe40Ni40B6Plq a l l o y is e q u a l t o 0 . 8 3 T and i t s C u r i e h e m p e r a t u r e r e a c h e s 250 OC b u t t h e s a t u r a t i o n m a g n e t o s t r i c t i o n (As = 1 2 x 10- ) i s n o t s o h i g h a s i n i r o n - r i c h m e t a l l i c g l a s s e s , e . g . [6]. T h e i r magnetomechanical c o u p l i n g c o e f f i c i e n t k e x h i b i i s maximum v a l u e from 0 . 1 f o r as quenched s t a t e t o 0 . 2 5 a f t e r a n n e a l i n g a t 310 C171. From t h i s r e a s o n t h e sound v e l o c i t i e s c h a n g e s s h o u l d b e a l s o h i g h e r a f t e r a n n e a l i n g above C u r i e t e m p e r a t u r e .
S t r i p - s h a p e s a m p l e s were c u t from t h e r i b b o n o f t h e Fe40Ni40B6P14 m e t a l l i c g l a s s . T h e r e were 50 mm l o n g and 4 mm w i d e . T h e i r t h i c k n e s s was e q u a l t o a b o u t 25 pm. The u l t r a s o u n d v e l o c i t i e s a t c o n s t a n t m a g n e t i c f i e l d ( c ) and a t c o n s t a n t m a g n e t i c i n d u c t i o n ( c 8 ) w e r e c a l c u l a t e d from t h e r e s o n a i t ( f r ) and a n t i r e s o n a n t ( f a ) f r e q u e n c i e s , r e s p e c t i v e l y , i . e .
where 1 is t h e l e g t h of t h e h a l f - w a v e r e s o n a t o r , i . e . 1
=
50 mm. T h r e e sam- p l e s were measured f o r a s - q u e n c h e s s t a t e and a f t e r a n n e g l i n g f o r 1 h a t t h e t e m p e r a t u r e s of 200, 2 3 0 , 250, 310, 330, 350 and 360 C . The a m p l i t u d e of a c m a g n e t i c f i e l d was between 1 and 3 A/m and m a g n e t i c b i a s f i e l d H was changed from z e r o t o 800 A / m . Measurements were c a r r i e d o u t a t two t i m e s h i g h e r f r a q u e n c i e s t h a n t h e l o w e r l i m i t of t h e u l t r a s o u n d r a n g e , ' i . e . a t a b o u t 44 2 6 kHz.3
-
RESULTSThe d e p e n d e n c e s of t h e u l t r a s o u n d v e l o c i t i e s a t t h e c o n s t a n t m a g n e t i c f i e l d s ( C ) and a t t h e c o n s t a n t m a g n e t i c i n d u c t i o n ( c ) on t h e m a g n e t i c b i a s f i e l d
(HY
a r e p r e s e n t e d i n f i g u r e s 1 and 2 . The a n n e g l i n g w e r e c a r r i e d o u t t o t h e t e m p e r a t u r e of 390 OC b u t t h e s a m p l e s became p o l y c r y s t a l s and r e s u l t s a r e g i v e n up t o 3 6 0 ' ~ . I n f i g . l a , t h e r e a r e p r e s e n t e d c h a r a c t e r i s t i c s f o r t h eArticle published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1990206
COLLOQUE DE PHYSIQUE
all three samples at the as-quenched state. Samples no. 1 and no. 2 were together anneled at the temperatures of 200 and 230 OC (fig. lb)
.
Startingfrom the Curie temperature each sample had its indiwidual programme. Sample no.3 was measured at as-quenched state and next after annealing at the tem- perature of 360 OC. The crystallization temperature was equal to-365 OC.
Over the crystallization temperature the magnetomechanical coupling vanishes and the magnetostrictive resonance was not observed. The ultrasound velocity was changing from 3800 m/s to 4600 m/s depending on the magnetic polarization and anneling temperature.
Fig. I . Ultrasound velocities cH and c g versus magnetic bias field H for the as-quenched sample of m e t a l l i ~ glass (a) and for the samples after annealing at 200 ( b ) , 230 (c) and 250 C ( d ) .
Polycrystalline iron-nickel alloys , containing 45-50 wt. X N i are middle- class piezomagnetic materials comparable with nickel, e.g. [8,9]. The same proportions of the iron and nickel, i.e. 1:1, used in metallic glasses give good results comparable or better than those of nickel [7-91. The magnetome- chanical coupling coefficient of this alloy after annealing at, the temperatu- res higher than Curie temperature was higher then 0.25. But near crysta- llization temperature maximum value of the magnetomechanical coupling decre- ase and also AE effect, i.e. change of the Young's modulus E (or G) when material is magnetized from demagnetization state up to the magnetic satu- ration, is lower. That is the reason of the lower changes of the ultra- sound velocities after annealing at these temperatures.
Fig. 2. Dependences of the ultrasound velocities c and c on magnetic hias field ( H > for the samples annealed for 1 h at 310 ?a), 33& ( b ) , 350 ( c ) and 360 "C ( d j
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When m a g n e t o m e c h a n i c a l c o u p l i n g v a n i s h e s ( k = O ) , s o u n d v e l o c i t i e s a t t h e c o n s t a n t m a g n e t i c f i e l d a n d a t t h e c o n s t a n t m a g n e t i c i n d u c t i o n a r e e q u a l e a c h t o o t h e r , i . e . f o r t h e d e m a g n e t i z a t i o n s t a t e c H o = c R n a n d f o r t h e mag-
.. . - -
n e t i c s a t u r a t i o n cHs = cgs = c , w h e r e c is s o u n d v e l o c i t y c a l c u l a t e d f r o m t h e Young m o d u l u s E , i . e . c = ( ~ / p ) ' " ~ ( p i s d e n s i t y a n d f o r t h e i n v e s t i - g a t e d m e t a l l i c g l a s s i s e q u a l t o 7 . 5 Mg/m ) . When t h e m a g n e t i c d o m a i n s t r u c - t u r e v a n i s h e s t h e H o o k e ' s l a w is v a l i d . I t m e a n s t h a t s t r a i n s a r e p r o p o r t i o - n a l t o s t r e s s e s a n d t h e p r o p o r t i o n a l i t y c o n s t a n t i s e q u a l t o t h e m o a u l u s E o r t o 1 / E . S o u n d v e l o c i t y is c h a n g i n g w i t h m a g n e t i c f i e l d i n a l m o s t a l l magne- t i c m a t e r i a l s . E s p e c i a l l y h i g h v a r i a t i o n s a r e o b s e r v e d i n t h e g o o d p i e z o m a g - n e t i c m a t e r i a l s . Among t h e m , t h e h i g h e s t v e l o c i t y c h a n g e s o c c u r i n m e t a l l i c g l a s s e s b e c a u s e t h e s e m a t e r i a l s d o n o t e x h i b i t m a g n e t o c r y s t a l l i n e a n i s o t r o p y . I n t h e p a r t i a l l y c r y s t a l l i z e d m e t a l l i c g l a s s e s t h i s phenomenon d e c r e a s e s ( s e e r e s u l t s f o r t h e a n n e a l i n g a t t h e t e m p e r a t u r e of 3 6 0 OC i n f i g . 2 d ) .
A u t h o r t h a n k s h i s c o w o r k e r s M L e s z e k M a k k i f i s k i , Mrs E l t b i e t a M i l e w s k a r , Mr A n d r z e j K r z y t e w s l r i a n d Mrs Ewa Z u k - Z a g 6 r s k a f o r t h e i r s c i e n t i f i c a n d t e c h - n i c a l a s s i s t a n c e d u r i n g i n v e s t i g a t i o n s .
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