Interdiffusion at Room Temperature in Cu-Ni(Fe) Nanolaminates
Source abstract
Abstract
The decomposition of a one-dimensional composition wave in Cu-Ni(Fe) nanolaminate structures is quantified using X-ray diffraction to assess kinetics of the interdiffusion process for samples aged at room temperature for 30 years. Definitive evidence for growth to the composition modulation within the chemical spinodal is found through measurement of a negative interdiffusivity for each of sixteen different nanolaminate samples over a composition wavelength range of 2.1–10.6 nm. A diffusivity value Ď of 1.77 × 10−24 cm2·s−1 is determined for the Cu-Ni(Fe) alloy system, perhaps the first such measurement at a ratio of melt temperature to test temperature that is greater than 5. The anomalously high diffusivity value with respect to bulk diffusion is attributed to the nanolaminate structure that features paths for short-circuit diffusion through interlayer grain boundaries.
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Research context
OpenAlex topics: nanoparticles nucleation surface interactions · Microstructure and mechanical properties · Anodic Oxide Films and Nanostructures
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Affiliations
Materials Sciences—Energy Nanomaterials, Sandia National Laboratory, Livermore, CA 94551-0969, USA
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