Deformation of small-volume Al-4Cu alloy under electron beam irradiation

Shi-Hao Li; Wei-Zhong Han; Zhi-Wei Shan

doi:10.1016/j.actamat.2017.09.015

Deformation of small-volume Al-4Cu alloy under electron beam irradiation

Shi-Hao Li
, Wei-Zhong Han
, Zhi-Wei Shan

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

24 Citations (Scopus)

Abstract

Energetic electron beams (e-beams) are used in the welding, 3D printing and imaging of various materials. It is commonly accepted that the e-beam irradiation inside transmission electron microscope has a negligible effect on the intrinsic mechanical properties of small-volume metallic materials during in situ investigation. However, as small-volume Al is usually covered by a thin layer of native oxide, we show here that high-energy (200 keV) e-beam irradiation can dramatically alter the deformation behavior. E-beam irradiation can drastically rejuvenate the amorphous structure of the oxide layer, producing a defective interface/surface, and promoting the transition of the deformation mode from internal dislocation multiplication to interface-dominated dislocation nucleation mediated plasticity, as indicated by the enhanced strain rate sensitivity and reduced activation volume. Moreover, the amorphous oxide layer undergoes viscous flow under the e-beam irradiation, such that nanoscale single-crystal Al confined by a 29% volume fraction of native oxide shell exhibits more than 60% uniform elongation. © 2017 Acta Materialia Inc.

Original language	English
Pages (from-to)	183-192
Journal	Acta Materialia
Volume	141
DOIs	https://doi.org/10.1016/j.actamat.2017.09.015
Publication status	Published - 1 Dec 2017
Externally published	Yes

Bibliographical 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].

Funding

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51471128 , 51621063 ). W.Z.H. would like to thank the support of the National Key Research and Development Program of China ( 2017YFB0702301 ), the Youth Thousand Talents Program of China and the Young Talent Support Plan of XJTU . We appreciate the critical reading by Prof. Evan Ma and Prof. Ju Li.

Research Keywords

Activation volume
Al oxide shell
Ductility
Electron beam irradiation
Strain rate sensitivity

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title = "Deformation of small-volume Al-4Cu alloy under electron beam irradiation",

abstract = "Energetic electron beams (e-beams) are used in the welding, 3D printing and imaging of various materials. It is commonly accepted that the e-beam irradiation inside transmission electron microscope has a negligible effect on the intrinsic mechanical properties of small-volume metallic materials during in situ investigation. However, as small-volume Al is usually covered by a thin layer of native oxide, we show here that high-energy (200 keV) e-beam irradiation can dramatically alter the deformation behavior. E-beam irradiation can drastically rejuvenate the amorphous structure of the oxide layer, producing a defective interface/surface, and promoting the transition of the deformation mode from internal dislocation multiplication to interface-dominated dislocation nucleation mediated plasticity, as indicated by the enhanced strain rate sensitivity and reduced activation volume. Moreover, the amorphous oxide layer undergoes viscous flow under the e-beam irradiation, such that nanoscale single-crystal Al confined by a 29\% volume fraction of native oxide shell exhibits more than 60\% uniform elongation. {\textcopyright} 2017 Acta Materialia Inc.",

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author = "Shi-Hao Li and Wei-Zhong Han and Zhi-Wei Shan",

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T1 - Deformation of small-volume Al-4Cu alloy under electron beam irradiation

AU - Li, Shi-Hao

AU - Han, Wei-Zhong

AU - Shan, Zhi-Wei

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 - 2017/12/1

Y1 - 2017/12/1

N2 - Energetic electron beams (e-beams) are used in the welding, 3D printing and imaging of various materials. It is commonly accepted that the e-beam irradiation inside transmission electron microscope has a negligible effect on the intrinsic mechanical properties of small-volume metallic materials during in situ investigation. However, as small-volume Al is usually covered by a thin layer of native oxide, we show here that high-energy (200 keV) e-beam irradiation can dramatically alter the deformation behavior. E-beam irradiation can drastically rejuvenate the amorphous structure of the oxide layer, producing a defective interface/surface, and promoting the transition of the deformation mode from internal dislocation multiplication to interface-dominated dislocation nucleation mediated plasticity, as indicated by the enhanced strain rate sensitivity and reduced activation volume. Moreover, the amorphous oxide layer undergoes viscous flow under the e-beam irradiation, such that nanoscale single-crystal Al confined by a 29% volume fraction of native oxide shell exhibits more than 60% uniform elongation. © 2017 Acta Materialia Inc.

AB - Energetic electron beams (e-beams) are used in the welding, 3D printing and imaging of various materials. It is commonly accepted that the e-beam irradiation inside transmission electron microscope has a negligible effect on the intrinsic mechanical properties of small-volume metallic materials during in situ investigation. However, as small-volume Al is usually covered by a thin layer of native oxide, we show here that high-energy (200 keV) e-beam irradiation can dramatically alter the deformation behavior. E-beam irradiation can drastically rejuvenate the amorphous structure of the oxide layer, producing a defective interface/surface, and promoting the transition of the deformation mode from internal dislocation multiplication to interface-dominated dislocation nucleation mediated plasticity, as indicated by the enhanced strain rate sensitivity and reduced activation volume. Moreover, the amorphous oxide layer undergoes viscous flow under the e-beam irradiation, such that nanoscale single-crystal Al confined by a 29% volume fraction of native oxide shell exhibits more than 60% uniform elongation. © 2017 Acta Materialia Inc.

KW - Activation volume

KW - Al oxide shell

KW - Ductility

KW - Electron beam irradiation

KW - Strain rate sensitivity

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U2 - 10.1016/j.actamat.2017.09.015

DO - 10.1016/j.actamat.2017.09.015

M3 - RGC 21 - Publication in refereed journal

SN - 1359-6454

VL - 141

SP - 183

EP - 192

JO - Acta Materialia

JF - Acta Materialia

ER -

Deformation of small-volume Al-4Cu alloy under electron beam irradiation

Abstract

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Research Keywords

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