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Self-tw
in
n
in
g
in
solid-state decomposition
详细信息
查看全文
作者:
Tae-Ho
Lee
;
lth@kims.re.kr" class="auth_mail" title="E-mail the correspond
in
g author
;
Heon-Young Ha
;
Jae
Hoo
n Jang
;
Jun-Yun Kang
;
Joonoh Moon
;
Jun Young Park
;
Chang-
Hoo
n
Lee
;
Seong-Jun Park
关键词:
Self-tw
in
n
in
g
;
Decomposition
;
Precipitation
;
Partial dislocation
;
TEM
刊名:Acta Materialia
出版年:2017
出版时间:15 January 2017
年:2017
卷:123
期:Complete
页码:197-205
全文大小:3973 K
文摘
Tw
in
n
in
g
in
face-centered cubic materials has received
in
creas
in
g attention ow
in
g to its favorable contributions to materials properties. While the models designed to account for tw
in
nucleation have been ma
in
ly concerned with deformation tw
in
n
in
g under external stress, address
in
g autocatalytic nucleation of tw
in
(
self-tw
in
n
in
g
) rema
in
s a challenge. Here, we report experimental evidences and a dislocation-based model demonstrat
in
g that a new source for tw
in
n
in
g (self-tw
in
n
in
g) operatives dur
in
g solid-state decomposition. The
in
itial stage of self-tw
in
n
in
g is a stress relaxation process to relieve the local stress concentration caused by pile-up of
in
terfacial dislocations at the precipitate-matrix
in
terface. Dynamical two-beam analyses on dislocations configurations showed that three types of partial dislocations were
in
volved
in
self-tw
in
n
in
g: two Shockley partials,
inl
in
eImage" height="32" width="41" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-
in
limgeid="1-s2.0-S1359645416308072-si1.gif">
in-ars.els-cdn.com/content/image/1-s2.0-S1359645416308072-si1.gif">
iner hidden">
1
6
[
112
]
on primary
inl
in
eImage" height="17" width="33" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-
in
limgeid="1-s2.0-S1359645416308072-si2.gif">
in-ars.els-cdn.com/content/image/1-s2.0-S1359645416308072-si2.gif">
iner hidden">
(
11
1
¯
)
plane and
inl
in
eImage" height="32" width="41" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-
in
limgeid="1-s2.0-S1359645416308072-si3.gif">
in-ars.els-cdn.com/content/image/1-s2.0-S1359645416308072-si3.gif">
iner hidden">
1
6
[
11
2
¯
]
on conjugate (111) plane; a stair-rod dislocation of
inl
in
eImage" height="32" width="41" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-
in
limgeid="1-s2.0-S1359645416308072-si4.gif">
in-ars.els-cdn.com/content/image/1-s2.0-S1359645416308072-si4.gif">
iner hidden">
1
6
[
110
]
connect
in
g primary and conjugate planes. We further show that the thermally-activated cross-slip of Shockley partials with aid of stair-rod dislocation plays a crucial role
in
self-tw
in
n
in
g process.
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