Interdiffusion at Room Temperature in Cu-Ni(Fe) Nanolaminates
- Sandia National Lab. (SNL-CA), Livermore, CA (United States). Materials Sciences—Energy Nanomaterials
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 D 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.
- Research Organization:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0003525
- OSTI ID:
- 1477876
- Report Number(s):
- SAND--2017-10068J; 657116
- Journal Information:
- Coatings, Journal Name: Coatings Journal Issue: 6 Vol. 8; ISSN 2079-6412
- Publisher:
- MDPICopyright Statement
- Country of Publication:
- United States
- Language:
- English
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