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Enhanced radiation tolerance in immiscible Cu/Fe multilayers with coherent and incoherent layer interfaces

Published online by Cambridge University Press:  17 February 2015

Youxing Chen
Affiliation:
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
Engang Fu
Affiliation:
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People's Republic of China
Kaiyuan Yu
Affiliation:
Department of Materials Science and Engineering, China University of Petroleum-Beijing, Beijing 102249, People's Republic of China
Miao Song
Affiliation:
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
Yue Liu
Affiliation:
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
Yongqiang Wang
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Haiyan Wang
Affiliation:
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA; and Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843, USA
Xinghang Zhang*
Affiliation:
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA; and Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843, USA
*
a)Address all correspondence to this author. e-mail: zhangx@tamu.edu
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Abstract

Recent studies have shown that chemical immiscibility is important to achieve enhanced radiation tolerance in metallic multilayers as immiscible layer interfaces are more stable against radiation induced mixing than miscible interfaces. However, as most of these immiscible systems have incoherent interfaces, the influence of coherency on radiation resistance of immiscible systems remains poorly understood. Here, we report on radiation response of immiscible Cu/Fe multilayers, with individual layer thickness h varying from 0.75 to 100 nm, subjected to He ion irradiation. When interface is incoherent, the peak bubble density decreases with decreasing h and reaches a minimum when h is 5 nm. At even smaller h when interface is increasingly coherent, the peak bubble density increases again. However, void swelling in coherent multilayers with smaller h remains less than those in incoherent multilayers. Our study suggests that the coherent immiscible interface is also effective to alleviate radiation induced damage.

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Articles
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Khalid Hattar

References

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