2021/12/20 by O. A. Lukianova, Lukianova, O. A., V. Kulitckii +9 · 1 citation
Chemistry · Engineering · Physics and Astronomy · #Advanced Materials Characterization Techniques #Alloy #Carbon fibers #Chemistry #Composite material #Crystallography #Diffusion #Effective diffusion coefficient #FOS: Physical sciences #High Entropy Alloys Studies #High entropy alloys #High-Temperature Coating Behaviors #Lattice (music) #Lattice diffusion coefficient #Materials Science (cond-mat.mtrl-sci) #Materials science #Metallurgy #Physics #Self-diffusion #TRACER #Thermodynamics #Vacancy defect #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.2112.10507
published in arXiv (Cornell University) (Cornell University) · 7 figures, 4 tables
arxiv created 2021/12/20 · arxiv updated 2021/12/21
Tracer diffusion of the substitutional components in (CoCrFeNiMn)1-xCx high-entropy alloys with x = 0.002, 0.005 and 0.008 (in at. fractions) is measured at elevated temperatures from 1173 to 1373 K. Two different characteristic effects of interstitial carbon addition on substitutional diffusion in these FCC alloys are distinguished. At the highest temperature of 1373 K, alloying by C with relatively low concentrations (x = 0.002) retards diffusion of the substitutional elements with respect to those in the C-free alloy. At lower temperatures and/or higher C concentrations (x > 0.005), an enhancement of the diffusion rates of all substitutional elements is seen. A model is suggested that relates the self-diffusivities in the CoCrFeMnNi-C alloys with the lattice distortion imposed by interstitially dissolved carbon. The experimental results are interpreted in terms of a decrease of the migration barriers for vacancy-mediated diffusion due to the presence of interstitial C atoms.