Abstract
The mechanical properties of multilayer films consisting of alternating layers of magnesium and niobium are investigated through micropillar compression experiments across a broad range of temperatures. The data collected from the variable temperature micropillar compression tests and strain rate jump tests are used to gain insight into the operative deformation mechanisms within the material. At higher temperatures, diffusion-based deformation mechanisms are shown to determine the plastic behavior of the multilayers. Diffusion occurs more readily along the magnesium–niobium interface than within the bulk, acting as pathway for magnesium diffusion. When individual layer thicknesses are sufficiently small, diffusion can remain the dominant deformation mechanism down to room temperature. Multilayer strengthening models historically rely solely on dislocation-based arguments; therefore, consideration of diffusion-based deformation in nanolaminates with low melting temperature components offers improved understanding of multilayer behavior.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 10884-10901 |
| Number of pages | 18 |
| Journal | Journal of Materials Science |
| Volume | 54 |
| Issue number | 15 |
| DOIs | |
| State | Published - Aug 15 2019 |
Bibliographical note
Funding Information:The research leading to these results has received funding from STEEP, a Marie Curie Action Initial Training Network (ITN) of the European Union’s Seventh Framework Program FP7 under REA grant agreement number 316560. The open and friendly atmosphere at both LANL and Empa has enabled this international collaboration. SP acknowledges support from NSF MRI #1726897 and NSF #1841331. This work was performed in part at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the U.S. Department of Energy under contract DE-AC52-06NA25396. Alemnis is also gratefully acknowledged for the development of the instrumentation and methodology used to perform the cryogenic tests.
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