Enhanced radiation tolerance in immiscible Cu/Fe multilayers with coherent and incoherent layer interfaces
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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 and 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 Zhanga) 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 (Received 12 September 2014; accepted 16 January 2015)
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.
I. INTRODUCTION
Neutron radiation creates two major types of radiation damage in structural materials: point defects and their clusters,1 and transmutation induced helium (He), which can swiftly combine with vacancies to form He bubbles.2–4 These radiation induced defects can significantly degrade the mechanical stability of irradiated metallic materials. To alleviate radiation damage in structural materials, various types of defect sinks have been investigated, including grain boundaries (GBs)5–9 and interphase boundaries.10–14
Contributing Editor: Khalid Hattar a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2015.24 J. Mater. Res., 2015
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GBs, which are unbiased sinks,12,13 can mitigate radiation damage by absorbing point defects and clusters, and promoting their recombination.15,16 Radiation studies on nanocrystalline (nc) metals show that defect density can be significantly reduced6,
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