Tracer diffusion in single crystalline CoCrFeNi and CoCrFeMnNi high entropy alloys
| Autor: | Y.I. Chumlyakov, Sergiy V. Divinski, Josua Kottke, Gerhard Wilde, Daniel Gaertner |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Arrhenius equation Self-diffusion Materials science Mechanical Engineering High entropy alloys Diffusion Enthalpy Thermodynamics 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences symbols.namesake Physics in General Mechanics of Materials TRACER 0103 physical sciences symbols General Materials Science 0210 nano-technology Single crystal |
| Zdroj: | Journal of Materials Research |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2018.162 |
| Popis: | High entropy alloys are multicomponent alloys, which consist of five or more elements in equiatomic or nearly equiatomic concentrations. These materials are hypothesized to show significantly decreased self-diffusivities. For the first time, diffusion of all constituent elements in equiatomic CoCrFeNi and CoCrFeMnNi single crystals and additionally solute diffusion of Mn in the quaternary alloy is investigated using the radiotracer technique, thereby the tracer diffusion coefficients of $^57$Co, $^51$Cr, $^59$Fe, $^54$Mn, and $^63$Ni are determined at a temperature of 1373 K. The components are characterized by significantly different diffusion rates, with Mn being the fastest element and Ni and Co being the slowest ones. Furthermore, solute diffusion of Cu in the CoCrFeNi single crystal is investigated in the temperature range of 973–1173 K using the $^64$Cu isotope. In the quaternary alloy, Cu is found to be a fast diffuser at the moderate temperatures below 1273 K and its diffusion rate follows the Arrhenius law with an activation enthalpy of about 149 kJ/mol. |
| Databáze: | OpenAIRE |
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