In-situ observation of dislocation dynamics near heterostructured interfaces

Hao Zhou; Chongxiang Huang; Xuechao Sha; Lirong Xiao; Xiaolong Ma; Heinz Werner Höppel; Mathias Göken; Xiaolei Wu; Kei Ameyama; Xiaodong Han; Yuntian Zhu

doi:10.1080/21663831.2019.1616330

In-situ observation of dislocation dynamics near heterostructured interfaces

Hao Zhou
, Chongxiang Huang
, Xuechao Sha
, Lirong Xiao
, Xiaolong Ma
, Heinz Werner Höppel
, Mathias Göken
, Xiaolei Wu
, Kei Ameyama
, Xiaodong Han^*
, Yuntian Zhu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

167 Citations (Scopus)

84 Downloads (CityUHK Scholars)

Abstract

There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu-brass heterostructured TEM film Frank-Read sources are the primary dislocation sources. They were dynamically formed and deactivated throughout the deformation in grain interior, which has never been reported before. This observation indicates that strain gradient near interfaces cannot be quantitatively related to the density gradient of geometrically necessary dislocations, and it was primarily produced by Frank-Read source gradient instead of dislocation pile-ups. These findings provide new insights on how to design heterostructured interfaces to enhance mechanical properties.

Original language	English
Pages (from-to)	376-382
Journal	Materials Research Letters
Volume	7
Issue number	9
DOIs	https://doi.org/10.1080/21663831.2019.1616330
Publication status	Published - 8 Jan 2019
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Deformation mechanism
Frank-Read source
Heterostructured materials
In-situ TEM

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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title = "In-situ observation of dislocation dynamics near heterostructured interfaces",

abstract = "There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu-brass heterostructured TEM film Frank-Read sources are the primary dislocation sources. They were dynamically formed and deactivated throughout the deformation in grain interior, which has never been reported before. This observation indicates that strain gradient near interfaces cannot be quantitatively related to the density gradient of geometrically necessary dislocations, and it was primarily produced by Frank-Read source gradient instead of dislocation pile-ups. These findings provide new insights on how to design heterostructured interfaces to enhance mechanical properties.",

keywords = "Deformation mechanism, Frank-Read source, Heterostructured materials, In-situ TEM",

author = "Hao Zhou and Chongxiang Huang and Xuechao Sha and Lirong Xiao and Xiaolong Ma and H{\"o}ppel, \{Heinz Werner\} and Mathias G{\"o}ken and Xiaolei Wu and Kei Ameyama and Xiaodong Han and Yuntian Zhu",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

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doi = "10.1080/21663831.2019.1616330",

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volume = "7",

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journal = "Materials Research Letters",

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TY - JOUR

T1 - In-situ observation of dislocation dynamics near heterostructured interfaces

AU - Zhou, Hao

AU - Huang, Chongxiang

AU - Sha, Xuechao

AU - Xiao, Lirong

AU - Ma, Xiaolong

AU - Höppel, Heinz Werner

AU - Göken, Mathias

AU - Wu, Xiaolei

AU - Ameyama, Kei

AU - Han, Xiaodong

AU - Zhu, Yuntian

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2019/1/8

Y1 - 2019/1/8

N2 - There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu-brass heterostructured TEM film Frank-Read sources are the primary dislocation sources. They were dynamically formed and deactivated throughout the deformation in grain interior, which has never been reported before. This observation indicates that strain gradient near interfaces cannot be quantitatively related to the density gradient of geometrically necessary dislocations, and it was primarily produced by Frank-Read source gradient instead of dislocation pile-ups. These findings provide new insights on how to design heterostructured interfaces to enhance mechanical properties.

AB - There has been a long-standing controversy on how dislocations interact with interfaces. Here we report in-situ observations that in a Cu-brass heterostructured TEM film Frank-Read sources are the primary dislocation sources. They were dynamically formed and deactivated throughout the deformation in grain interior, which has never been reported before. This observation indicates that strain gradient near interfaces cannot be quantitatively related to the density gradient of geometrically necessary dislocations, and it was primarily produced by Frank-Read source gradient instead of dislocation pile-ups. These findings provide new insights on how to design heterostructured interfaces to enhance mechanical properties.

KW - Deformation mechanism

KW - Frank-Read source

KW - Heterostructured materials

KW - In-situ TEM

UR - https://www.scopus.com/pages/publications/85069007998

UR - https://www.scopus.com/pages/publications/85069007998#tab=impact

U2 - 10.1080/21663831.2019.1616330

DO - 10.1080/21663831.2019.1616330

M3 - RGC 21 - Publication in refereed journal

SN - 2166-3831

VL - 7

SP - 376

EP - 382

JO - Materials Research Letters

JF - Materials Research Letters

IS - 9

ER -

In-situ observation of dislocation dynamics near heterostructured interfaces

Abstract

Bibliographical note

Research Keywords

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