Vol.19 No.6 周国辉等：温度和加载速率对位错发射影响的原子级模拟 ·609· Phil Mag,1987,A56:735 11 Heermann D W.Computer Simulation Methods in Theoretic Physics,(2nd).Barlin:Springer-Verlag,1990 Atomistic Simulation of the Influence of Temperature and Loading Rate on Dislocation Emission Zhou Guohui Wang Donglei Huang Yizhong Chu Wuyang Zhou Fuxin2 1)Applied Science School,UST Beijing.Beijing 100083,China 2)Institute of Mechanics,Chinese Academy of Sciences,100080 ABSTRACT Utilizing EAM potential,Al single crystal with molecular dynamics simula- tion method was studied.Under mode I and II loading,the influence of temperature and loading rate on dislocation emission and the critical stress intensity factor was analyzed. The simulated results show that the critical stress intensity factor for dislocation emission decreases exponentially as the temperature increases.Loading rate will influence the criti- cal stress intensity factor to some degree.The critical stress intensity factor will increase as loading rate increases. KEY WORDS dislocation emission,molecular dynamics,atomistic simulation,Al ***中**********中****中******中*中中*****中中中*中*中中中**中中**中*************中 (上接584页) Strain-induced Microstructural Changes and Effects of Alloying Elements for Fe,Al-based Alloys (II) Chen Guoliang Huang Yuanding Zhang Lichun Sun Zuging Yang Wangyue State Key Laboratory for Advanced Metals and Materials,UST Beijing,Beijing 100083.China ABSTRACT Effects of Cr and Mo on machanical properties and micro-structure of Fe,Al based alloys were investigated from the point of the strain-induced microstructural changes in Fe,Al-based alloys during room temperature deformation and high temperature creep.It is found that both Cr and Mo soluted into the matrix of Fe,Al-based alloys.The Addi- tion of Cr can accelerate strain-induced disordering resulting in an effect of solution soften- ing.The addition of Mo is beneficial to creep-induced reordering and to increase the recrys tallization temperature,resulting in solution strengthening. KEY WORDS intermetallics,iron aluminides,creep,ordering,strain induced disordering and orderingV o l . 19 N O . 6 周国 辉等 : 温度和加 载速率对位 错发射影 响的原子级模拟 . 6 0 9 . P hi l M a g , 19 8 7 , A 5 6 : 7 3 5 1 1 eH e mr an D W . C om P uet r S im u l a it o n M e ht ed s i n hT e o er it e hP y s i e s , (Z nd ) . B alr i n : S画 n g e -r V e ir ag , 1 9 9 0 A t o m i s t i e 5 1们。 u l a t i o n o f t h e o f T e m P e r a tu r e an d L o a d i n g R at e o n I n fl u e n C e D I S l o c at i o n E m i s s i o n 及 o u G u o h u i , ) Wa n g D o n g le i , ) uH a n g K z h o n g , ) hC u 州弓 , a n g , ) 及 。 、 凡加 , ) l ) A P Pli e d S e i e cn e S e h o o l , 2 ) I n s it tu te o f M e e h am e s , U S T B e ij i n g , B e ij i n g 10 0 0 8 3 , C l l i n a C h i n e s e A e ad e m y o f S e i e cn e s , 10 0 0 8 0 A B S T R A C T U t lli z i n g E A M op te n it al , A I s i n g l e e yr s alt w i ht m o l e e u lar d y n a r n l e s s im ul a￾it o n m e ht o d w as s ut id e d . 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K E Y W O R D S d i s lco iat o n e 而 s s i o n , m o l e c u l ar d y n am i e s , a ot m i s it e s im u l a it o n , A I (上 接 5 8 4 页 ) S tr a i n 一 i n d u e e d M i e r o s加 e ut r a l C h a n g e s a n d E fe e t s o f A ll o y i n g E l e m e n t s fo r F e 3A I 一 b a s e d A l l o y s ( 11) hC e n G u o li a n g uH a n g uY a n id n g 助 a n g 刀 c h u n uS n 压q in g aY n g 肠 n gy u e 5 t a t e eK y 比bo m t o yr fo r A d v a cn e d M e alt s a n d M aet ir al s , U S T B e ij i n g , B e ij i n g 10 0 0 8 3 , C h ian A B ST R A C T E fe e ts o f C r a n d M o o n m ac h a n i c a l p r o 详 irt e s a n d 而 c or 一 s ctrU tu re o f eF 3 A I b as e d al l o y s w e re i n v e s it g a te d ofr m ht e P o i n t o f ht e s t r a l n 一 i n d cu e d m i e or s tru c tu arl c h an g e s i n eF 3 IA 一 b as e d al l o y s d u ir n g or o m te m详ar tu re d e of rm a it o n an d ih g h te m详 ar tu re c re e p . It 1 5 of u n d ht at ob ht C r a n d M o s o l u te d i n t o ht e m a itr x o f eF 3 A I 一 b as e d a ll o y s · hT e A d d i - it o n o f C r e an ac e e l e ar te s tr a l n 一 i n d cu e d d i s o 记e ir n g re s u lit n g i n an e fe e t o f s o l u it o n s o fte n - i n g . T七e ad d iit o n o f M o 1 5 be n e if e ial t o e re e 卜i n d u e e d re o dr e ir n g an d ot i n e re as e ht e re c ry s atl li z iat o n te m pe ar tu re , er s u lit n g i n s o l u it o n s ’tre n g ht e n i n g . K E Y W O R D S i n et mr e alt li e s , i or n a l um i n i d e s , c er e P , o dr e ir n g , s t r a i n i n d cu e d d i s o dr e ir n g an d o dr e ir n g