摘要
利用透射电子显微镜(TEM)在Fe-Ni-V-C合金中观察到一些马氏体核胚,核胚的结构为特殊的位错组态:Burgers矢量为1/2[011]fcc,且一端为封闭的发夹型位错,和在发夹型位错内塞税的、Burgers矢量为1/2[110]fcc的位错列。它们分别提供了马氏体相变所必须的二次切变。
The butterfly martensite nuclei in an Fe-Ni-V-C alloy were observed
under TEM to consist of the enveloping dislocations with Burgers vector 1/2[011]_(fcc)
and the arrays of dislocations with Burgers vector 1/2[110]_(fcc) piled up within the
formers. The enveloping dislocations and the arrays of dislocations provide the re-
quired shear when the planes (111)_(fcc) move over each other to alter their stacking
order and change into the planes (110)_(bcc) respectively. The neccessary adjustment of
the spacings is provided by the dislocations in martensite. The crystallographic rela-
tionship after double-shear is K-S one.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第3期A187-A192,共6页
Acta Metallurgica Sinica
关键词
铁镍基合金
马氏体
蝶状
核胚
位错
butterfly martensite
nuclei
enveloping dislocation
piling dislocation
