Vol.24 No.1 吴平等：冷却过程中明的的光非：平衡偏聚实验观祭 ·33· sion Reaction to Study Boron Behaviour in Materials[Jl.J Strength Aluminium Alloys [J].Acta Mater,1996,44: Phys D:Appl Phys,1983,16:1145 1857 3 Chapman M A V,Faulkner R G.Computer Modeling of 6 Carinci G M.Grain Boundary Segregation of Boron in an Grain Boundary Segregation[J].Acta Metall,1983,31: Austenitic Stainless Steel [J].Applied Surf Sci,1994. 677 76/77:266 4 Karlsson L,Norden H,Odelius H.Non-eguilibrium Grain 7 Valiev R Z,Korznikov A V.Mulynkov RR.Structure and Boundary Segregation of Boron in Austenitic Stainless Properties of Ultrafine-grained Materials Produced by Se- SteellJ].Acta Metall,1988,36:25 vere Plastic Deformation [J].Mater Sci Eng,1993, 5 Jiang 11,Faulkner R G.Modeling of Grain Boundary Seg- A168:141 regation,Precipitation and Precipitate-free Zones of High Experimental Observation of Non-equilibrium Segregation of Boron on Grain Boundaries during Cooling Process WU Ping,HE Xinlai.CAO Bing.YU Dongyou Material Science and Engineering School,UST Beijing.Beijing 100083,China ABSTRACT It was observed experimentally that boron segregated to grain boundaries in Fe-40%Ni alloy during cooling process by boron autoradiograph technique and transmission electron microscope.The non- equilibrium segregation of boron on grain boundaries during cooling process from I 150 to 640 C at 2 C/s shows three stages with different boron diffusion behaviors.The rich factors,widths of rich layer,depletion factors and widths of boron depletion zone were measured.The phenomena are discussed. KEY WORDS boron;grain boundary;diffusion;non-equilibrium segregationV匕1 . 2 4 N O . l 吴 平等 : 冷却过 程中硼 的品 界非 平衡 偏聚 实验观 察 . 3 3 . s i o n Re a e t i o n ot S t u d y B o r o n B e h a v i o u r i n M at e r i a l s 【J ] . J Ph y s D : A PP I P h y s , 19 8 3 , 16 : 1 1 4 5 C h a Pm an M A V, F a u lk n c r R G . C o m P u t e r M o d e li n g o f G r a i n B o u n d a yr S e g r e g a ti o n [ J ] . A e t a M e at ll , 19 8 3 , 3 1 : 6 7 7 K a r l s s o n L , N o rd e n H , ( ) d e li u s H . N o n 一 e q u i lib ir u m G r a i n B o u n d a ry S e gr e g a ti o n o f B o r o n in A u s te n i t i e S t a i n l e s s S t e e l lJI . A c 扭 M e ta ll , 19 8 8 , 3 6 : 2 5 Ji a n g 1 1 , Fa u lkn e r R G . M o d e li n g o f G r a i n B o u n d ary S e g - r e g a t i o n , Pre e i Piat ti o n a n d P r e e i Pi t a t e 一 fr e e Z o n e s o f 卜Iig h S tre n gt h A l u m i n i u m A l l o y s [ J】 . A e at M a t e r, 19 9 6 , 4 4 : ! 8 5 7 C ar i n c i G M . G r a i n B o un d ary S e gr e g at i o n o f B o r o n i n a n A u s te n i ti e S t a i n l e s s S t e e l 【J l . A P P li e d S u r f S e i , 19 9 4 , 7 6 / 7 7 : 2 6 6 Va l i e v R Z , K o r nz i k o v A V, M u ly n k o v R R . S tur e t u r e a n d P or pe rt i e s o f U l t r a if n e 一 g r a i n e d M a t e r i a l s Por d u c e d b y s e - v e r e Plas ti e D e fo mr a t i o n 【J』 . M a t e r S e i & E n g , 19 9 3 , A 16 8 : 14 1 E x P e ir m e n at l O b s e vr a t i o n o f N o n 一 e q u il i b r i u m S e g r e g a t i o n o f B o r o n o n G r a i n B o un d ar i e s d u r i n g C o o li n g P r o e e s s 附U 尸才码 万石 iX n al i . CA 口 B i .gn Y口 D o n g y o u M at e r i a l S e i o n e e 助d Egn i n e e r i n g s e ho l , U S T B e ij i n g , B e ij in g 10 0 8 3 , C h i n a A B S T R A C T It w a s o b s e vr e d e x P e ir m e n ta lly t h a t b o r o n s e gr e g at e d t o g ra i n b o u n d a ir e s i n F e 一 4 0 % N i a ll o y d u r i n g e o o li n g Pro e e s s b y b o r o n a ut o r a d i o gr a Ph t e e hn iq u e a n d t r a n s m i s s i o n e l e e tro n m i e r o s c o Pe . T h e n o n - e q u ilib r i um s e gr e g a t i o n o f b o r o n o n gr a i n b o un d a r i e s d u r i n g e o o li n g Pr o e e s s fr o m l l 5 0 t o 6 4 0 oC a t 2 oC / s s h o w s t h r e e s t眼e s w it h d i fe r e n t b o r o n d i fo s i o n b e h a v i o r s . T h e r i e h fa c t o r s , w id t h s o f r i c h l a y e ’r d e Pl e ti o n af e t o r s a n d w id t h s o f b o r o n d e Pl e ti o n z o n e w e er m e a s ur e d . T h e Ph e n o m e n a ar e d i s e u s s e d . K E Y w 0 R D S b o r o n : gr a i n b o u n d ayr ; d i伪 s i o n : n o n 一 e q u ilib r imU s e gr e g a t i o n