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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
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
Engang Fu
State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People's Republic of China
Kaiyuan Yu
Department of Materials Science and Engineering, China University of Petroleum-Beijing, Beijing 102249, People's Republic of China
Miao Song
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
Yue Liu
Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
Yongqiang Wang
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
Haiyan Wang
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*
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:
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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.

Copyright © Materials Research Society 2015 

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Contributing Editor: Khalid Hattar



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