Defect-interface interactions in irradiated Cu/Ag nanocomposites

Min Wang; Irene J. Beyerlein; Jian Zhang; Wei-Zhong Han

doi:10.1016/j.actamat.2018.09.003

Defect-interface interactions in irradiated Cu/Ag nanocomposites

Min Wang
, Irene J. Beyerlein
, Jian Zhang
, Wei-Zhong Han

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

93 Citations (Scopus)

Abstract

In this work, we employ transmission electron microscopy and helium ion irradiation to study the response of biphase interfaces to radiation induced point defect fluxes from the two adjoining phases. Analysis of interface-affected defect accumulation was carried out over a wide range of radiation damage levels from near zero displacement per atom (dpa) to 16 dpa and helium concentrations of 0 at.% to 8 at.%. Results show a strong interface density dependence in which Cu/Ag interfaces in the nanolayered regions spaced <500 nm were remarkably microstructural stable over the entire range without accumulating micro-scale defects, while those spaced >1 μm apart were destroyed. We report the concomitant development of a bubble-free zone in Cu that was independent of defect levels and interface-contacting bubbles zone in Ag. This finding is explained by bias segregation to the interface of interstitials from Ag and vacancies to misfit dislocation nodes in the interface from Cu. The point defect transfer across the interface can be explained by the spatial variation in interface pressure within the interface and gradient in pressure across the interface, both originating from the lattice mismatch and surface energy difference between the two crystals. © 2018 Acta Materialia Inc.

Original language	English
Pages (from-to)	211-223
Journal	Acta Materialia
Volume	160
DOIs	https://doi.org/10.1016/j.actamat.2018.09.003
Publication status	Published - 1 Nov 2018
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 Key Research and Development Program of China ( 2017YFB0702301 ) and the National Natural Science Foundation of China (Grant Nos. 51471128 and 51621063 ). W.Z.H. would like to acknowledge the support of Youth Thousand Talents Program of China and the Young Talent Support Plan of XJTU . I.J.B. acknowledges financial support from the National Science Foundation Designing Materials to Revolutionize and Engineer our Future Program ( NSF CMMI-1729887 ).

Research Keywords

Dislocations
Helium bubbles
Interface
Radiation defects
Vacancy pump

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title = "Defect-interface interactions in irradiated Cu/Ag nanocomposites",

abstract = "In this work, we employ transmission electron microscopy and helium ion irradiation to study the response of biphase interfaces to radiation induced point defect fluxes from the two adjoining phases. Analysis of interface-affected defect accumulation was carried out over a wide range of radiation damage levels from near zero displacement per atom (dpa) to 16 dpa and helium concentrations of 0 at.\% to 8 at.\%. Results show a strong interface density dependence in which Cu/Ag interfaces in the nanolayered regions spaced <500 nm were remarkably microstructural stable over the entire range without accumulating micro-scale defects, while those spaced >1 μm apart were destroyed. We report the concomitant development of a bubble-free zone in Cu that was independent of defect levels and interface-contacting bubbles zone in Ag. This finding is explained by bias segregation to the interface of interstitials from Ag and vacancies to misfit dislocation nodes in the interface from Cu. The point defect transfer across the interface can be explained by the spatial variation in interface pressure within the interface and gradient in pressure across the interface, both originating from the lattice mismatch and surface energy difference between the two crystals. {\textcopyright} 2018 Acta Materialia Inc.",

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author = "Min Wang and Beyerlein, \{Irene J.\} and Jian Zhang and Wei-Zhong Han",

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AU - Wang, Min

AU - Beyerlein, Irene J.

AU - Zhang, Jian

AU - Han, Wei-Zhong

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PY - 2018/11/1

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N2 - In this work, we employ transmission electron microscopy and helium ion irradiation to study the response of biphase interfaces to radiation induced point defect fluxes from the two adjoining phases. Analysis of interface-affected defect accumulation was carried out over a wide range of radiation damage levels from near zero displacement per atom (dpa) to 16 dpa and helium concentrations of 0 at.% to 8 at.%. Results show a strong interface density dependence in which Cu/Ag interfaces in the nanolayered regions spaced <500 nm were remarkably microstructural stable over the entire range without accumulating micro-scale defects, while those spaced >1 μm apart were destroyed. We report the concomitant development of a bubble-free zone in Cu that was independent of defect levels and interface-contacting bubbles zone in Ag. This finding is explained by bias segregation to the interface of interstitials from Ag and vacancies to misfit dislocation nodes in the interface from Cu. The point defect transfer across the interface can be explained by the spatial variation in interface pressure within the interface and gradient in pressure across the interface, both originating from the lattice mismatch and surface energy difference between the two crystals. © 2018 Acta Materialia Inc.

AB - In this work, we employ transmission electron microscopy and helium ion irradiation to study the response of biphase interfaces to radiation induced point defect fluxes from the two adjoining phases. Analysis of interface-affected defect accumulation was carried out over a wide range of radiation damage levels from near zero displacement per atom (dpa) to 16 dpa and helium concentrations of 0 at.% to 8 at.%. Results show a strong interface density dependence in which Cu/Ag interfaces in the nanolayered regions spaced <500 nm were remarkably microstructural stable over the entire range without accumulating micro-scale defects, while those spaced >1 μm apart were destroyed. We report the concomitant development of a bubble-free zone in Cu that was independent of defect levels and interface-contacting bubbles zone in Ag. This finding is explained by bias segregation to the interface of interstitials from Ag and vacancies to misfit dislocation nodes in the interface from Cu. The point defect transfer across the interface can be explained by the spatial variation in interface pressure within the interface and gradient in pressure across the interface, both originating from the lattice mismatch and surface energy difference between the two crystals. © 2018 Acta Materialia Inc.

KW - Dislocations

KW - Helium bubbles

KW - Interface

KW - Radiation defects

KW - Vacancy pump

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U2 - 10.1016/j.actamat.2018.09.003

DO - 10.1016/j.actamat.2018.09.003

M3 - RGC 21 - Publication in refereed journal

SN - 1359-6454

VL - 160

SP - 211

EP - 223

JO - Acta Materialia

JF - Acta Materialia

ER -

Defect-interface interactions in irradiated Cu/Ag nanocomposites

Abstract

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Research Keywords

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