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Philosophical Magazine Letters Volume 91, 2011 - Issue 1
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Original Articles

The influence of interfaces on the formation of bubbles in He-ion-irradiated Cu/Mo nanolayers

Nan Li Department of Mechanical Engineering, and Materials Science and Engineering Program, Texas A&M University, College Station, TX 77843-3123, USA; Materials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
,
J.J. Carter Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843-3133, USA
,
A. Misra Materials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
,
L. Shao Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843-3133, USA
,
H. Wang Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843-3128, USA
&
X. Zhang Department of Mechanical Engineering, and Materials Science and Engineering Program, Texas A&M University, College Station, TX 77843-3123, USACorrespondence[email protected]
Pages 18-28 | Received 06 Jul 2010, Accepted 02 Sep 2010, Published online: 30 Sep 2010
 
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Abstract

The role of immiscible Cu/Mo interfaces on the formation of helium (He) bubbles in ion-irradiated Cu/Mo 5 nm multilayers is examined. Interfaces significantly enhance the critical He concentration above which bubbles, approximately 1 nm in diameter, are detected via through-focus imaging in a transmission electron microscope. He-to-vacancy ratio affects the formation and distribution of He bubbles. The diameter of He bubbles in Cu appears to be slightly larger than that in Mo.

Acknowledgments

The authors at TAMU acknowledge funding by the US Army Research Office – Materials Science Division, under contract no. W911NF-09-1-0223. NL and AM at LANL acknowledge support from LANL Lab Directed R&D (LDRD) and DOE, Office of Basic Energy Sciences, Energy Frontier Research Center. The authors are grateful for discussions with M.J. Demkowicz (MIT) and Q.M. Wei (at LANL).

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