粒子偏析-基礎科學或應用工程

166

‘__..

_ .

duz - dX dX Xs-Xv=Q[ RT Xv(l-Xv) -2Cl

xs-xv=-

dW(Xs > XLl( I-Xv) dXs RT

xs-xv=-

dW(Xs) _c RT + dXs xv ( l-Xv) 167 : _ .

P

P = - exp(- e - E N - P -) n - p RT Xb x v = - exp(- AG X;-Xb 1 - x v -)RT

AG

XoX_bXb

=KXv=Xv exp ( - -) b RT 1 6 8 Xb _PG) Xg( l-n(Xb/XE)n]CXv exp(- R T 1 +XBET l+K1 8-XBET(l-*)

-t&2*=-$-y

x

,k,

=(i-*)[I-*Cl-V

Xb Xv - =F exp((Ei-EL)/RT) X;-Xb v Xb x v X;-Xb = - exp[I-XV -AG-c w( Xb / Xt > 3 RT Xbi X v i exp(-AGi /RT) . i i O= l;$(exp(-AGj/RT)-1) ’ *=_‘bi

azxv axv

D7=-.at

axv

D-

_{as E=CI=~ at =2 at}

d aXb B d dXv E=O X b ( t ) - X v

Xb (co)-Xv =l-exp C (Bd) 24Dt ]erf(

2/K

Bd )

Xb(t)

Xb (03) =

kexp(- $$-

>Cl-exp(-4(E+l)Dt >erf( BZdZ

C-E)

“*erf (---I l,Z-ED t

BZd2

i-I

1 E. A. Guggenheim, in its:’ London ( 19 3 3 )*

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“Modern

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;

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I

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, i n “ S u r f a c e A n a l y s i s i n M e t a l l u r g y ”

, D G M S y m p o s i u m (1983)109

39.C. L. Briant, Acta Met., 31(198 3)257 4o.w&& (NSC) $%& 77@iZ%

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