Fe2C 合金中形变诱导动态相变的蒙特卡罗模拟3 - 沈阳材料科学国家 ...

S 170
58
G def
i
r i . 5
. ,
,
, 2 2
. ,Q
:
n
H = 1 2
G b S S i j
+
G c i +
G def
i
m
j
n
i
n
i
i , (1)
, G c i i , G b S i
S j
i j , G def
i i
. Fe2C
,
Read2Shockley,
[8 ,9 ].
2111
. ,
. Mecking
Kocks [10 ]
d
d = k 1
, k 1 = 2 0 Π b
- k 2 . (2)
,
k 2 = 2 0 Π s ,
, b Burgers
,, 0 ,
2, s
2.
,
.
,,
.
,
.
,
. [ 10 ], 0
s . ,
2.
0 s 2
. Hatta [11 ] Zener2Hollomon
,,
2
.
()
2. ,Fe20111wt %
1151 K015 s - 1 ,
:= 015 , b = 01256 nm ,=
4612 GPa ;, 0 = 143815 MPa , s = 118163
MPa ;, 0 = 87210 MPa , s = 7119 MPa.
[ 11 ].
G def ,
G def
015 1 .
= b 2 , (3)
2121
.
.
,,
[12 ] .
. ,
. ,u
S v
:
(4) :
v x
v y
=
v = Su. (4)
l x 0
0 l y
u x
u y
. (5)
, u i ( i = x , y) u , v i ( i = x ,
y) , l i ( i = x , y)
.
i = ln l i ( i = x , y) .
,
S ,l x l y = 1. ,MC
.
,
,
.
2131
2
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