·84· 北京科技大学学报 1997年第1期 参考文献 1 Kim Y W.Mater Sci Eng,1995,A192/193:519 2 Feng C R,Michel D J,Crowe C R.Scripta Metall,1989,23:1135 3 Schwartz D S,Sastry S M L.Scripta Metall,1989,23:1621 4 Kim Y W.Acta Metall Mater,1992,40:1121 5 Chen G,Wang J,Zhang L,Ye H.Acta Metallurgica Sinica,1995,8:273 6 Zhao L,Tangri K.Acta Metall Mater,1991,39:2209 7 Zhao L,Tangri K.Phil Mag,1991,A64:361 8 Singh S R,Howe J M.Phil Mag,1992,A66:739 9 Ramanujan R V.Acta Metall,1994,42:2775 10 Denquin A,Naka S.Acta Metall Mater,1996,44:353 11 Tian H,Huang Z,Chen C.Scripta Metall Mater,1994,30:165 12 Yang Y,Wu S.Scripta Metall Mater,1991,25:255 Thermal Stability of Nonequilibrium Lamellar Structure in y-TiAl-based Two-phase Alloy Zhang Lichun)Wang Jinguo Chen Guoliang Ye Hengiang?) 1)State Key Laboratory for Advanced Metals and Materials.UST Beijing,Beijing 100083,China 2)Laboratory of Atomic Imaging of Solids,Institute of Metal Research,Academia Sinica,Shenyang 110015,China ABSTRACT The structural changes of nonequilibrium interlamellar boundaries with a rela- tively high strain energy during subsequent800℃，l5min,WQ and 1000℃，4min,WQ annealing were studied by the conventional and high resolution transmission electron microscopy in the hot-forged Ti-45Al-8Nb-2.5Mn-0.05B alloy.The structural relaxations are mainly as following:further bending of interlamellar boundaries,necking and spheroidization process of plates,formation of subgrain boundaries within y plates,etc.. KEY WORDS @,/Y,Y/Y interlamellar boundary,necking,spheroidization,subgrain boundary8 4 北 京 科 技 大 学 学 报 1 9 9 7年 第 l期 参 考 文 献 1 K i m Y W . M at e r S e i E n g , 1 9 9 5 , A 1 9 2 / 19 3 : 5 1 9 2 F e n g C R , M i e h e l D J , C or w e C R . S e ir P at M e at l l , 19 8 9 , 2 3 : 1 13 5 3 S e hw a 川比 D S , S a s ytr 5 M L . S e ir Pat M e at ll , 1 9 8 9 , 2 3 : 16 2 1 4 K im Y W . A e at M e at ll M a t e r , 19 9 2 , 4 0 : 1 1 2 1 5 C h e n G , W an g J , Z h an g L , Y e H . A e at M e at l lur g i e a S in i e a , 1 9 9 5 , 8 : 2 7 3 6 Z h a o L , T an hg K . A e at M e at ll M at e r , 19 9 1 , 3 9 : 2 2 0 9 7 Z h a o L , T an hg K . P h il M ag , 19 9 1 , A 6 4 : 3 6 1 8 Sin g h 5 R, Ho w e J M . Phi l M a g , 1 9 92 , A 6 6 : 73 9 g R丑 m an uj a n R V . A e at M e at l l , 19 9 4 , 4 2 : 2 7 7 5 1 0 D en qu in A , N ak a 5 . A e at M e at ll M at e r , 19 9 6 , 4 4 : 3 5 3 1 1 T i an H , H u an g Z , C h e n C . S e ir Pat M e at ll M a t e r , 19 9 4 , 3 0 : 16 5 1 2 Y an g Y , Wu 5 . S e ir Pat M e at l l M a et r , 1 9 9 1 , 2 5 : 2 5 5 T h e rm a l S t a b i li ty o f N o n e q u ili b r i u m L am e llar S trU c tu r e i n y 一 T IA I 一 b a s e d T w o 一 Ph a s e A l l o y hZ a n g aL b o 耐 o ry L i c h u n l ) 肠 n g iJ n圳 0 1 ) hC e n G u o li a n g l ) eY 价 n 叮ia n g Z ) l ) S at e K e y 2 ) aL ob art o ry of r A vd an e e d M e at l s an d M a t e ir a l s , U S T B e ij i n g , B e ij in g 10 0 0 8 3 , C h in a o f A t o m i e Im a g i n g o f S o lid s , I n s titu t e o f M e ta l R e s e arc h , A c ad e m i a S iin e a , S h e n y an g 1 10 0 15 , C h i n a A B S T R A C T T h e s tru e ot r a l e h an g e s o f n o n e q u ili b ir u m i n t e r l am e ll ar b o un d iar e s w iht a re l a￾t i v e l y h i g h s tr a i n e n e r g y d硕 n g s u b s e q u e n t 8 0 0 ℃ , 15 m i n , W Q a n d 1 0 0 0 ℃ , 4 m i n , W Q an e a lin g We r e s ut d i e d b y ht e c o n v e n t i o n a l a n d h i g h r e s o l u t i o n tr an s m i s s i o n e l e e tr o n m i e r o s e o Py i n ht e h o t 一 fo gr e d T i 一 4 5 A I 一 SN b 一 2 . S M n 一 0 . 0 5 B a ll o y . T h e s trU e ut r a l r e l a x at i o n s ar e m a in l y a s fo ll o w i n g : fu hrt e r b e n d i n g o f i n t e r l a m e ll ar b o u n d a ir e s , n e e k in g an d s p h e r o id iZ a t i o n p r o c e s s o f a Z p l a t e s , fo mr a t i o n o f s u b g r a i n b o u n d iar e s w i t h in Y p l at e s , e t c 二 KE Y w o 助5 a Z / 丫 , Y / 丫 in t e r l a m e llar b o u n d a 卿 , n e c k i n g , s p h e r o id i z at i o n , s u b g r a i n b o un d a yr