Interfaces act as obstacles to slip and sinks for radiation-induced defects. Hence, nanolayered composites that contain a large volume fraction of interfaces provide over an order of magnitude increase in strength and enhanced radiation damage tolerance compared to bulk materials. This paper shows the experimental and atomistic modeling results from a Cu-Nb nanolayered composite to highlight the roles of nanostructuring length scales and the response of interfaces to ion collision cascades in designing composite materials with high radiation damage tolerance. A. Misra, M.J. Demkowicz, and R.G. Hoagland are with Los Alamos National Laboratory, Los Alamos, NM, 87545; X. Zhang is now with the Department of Mechanical Engineering, Texas A&M University, College Station, TX. Dr. Misra can be reached at (505) 667-9860; e-mail amisra@lanl.gov.

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Vol. 60 No. 9 • JOM 75 www.tms.org/jom.html Overview Twinning in Nano-metals? This article reviews recent studies on the mechanical properties of sputtered copper and 330 stainless-steel fi lms with {111} nanoscale growth twins preferentially oriented perpendicular to growth direction. The mechanisms of formation of growth twins during sputtering, unusually high strengths, and excellent thermal stability of nanotwinned structures are highlighted.

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