High-Throughput Determination of Interdiffusion Coefficients for Co-Cr-Fe-Mn-Ni High-Entropy Alloys

• Published in: Journal of phase equilibria and diffusion Vol. 38; no. 4; pp. 457 - 465
• Main Authors: Chen, Weimin, Zhang, Lijun
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2017; Springer Nature B.V
• Subjects: Alloys; Ceramics; Chromium base alloys; Cobalt base alloys; Composites; Crystallography and Scattering Methods; Diffusion effects; Electron probe microanalysis; Emission analysis; Engineering Thermodynamics; Face centered cubic lattice; Ferrous alloys; Field emission; Glass; Heat and Mass Transfer; High entropy alloys; Interdiffusion; Inverse method; Manganese base alloys; Matrices (mathematics); Metallic Materials; Natural Materials; Nickel base alloys; Physics; Physics and Astronomy; Thermodynamics; interdiffusion; Co-Cr-Fe-Mn-Ni; high-entropy alloys; diffusion multiple; pragmatic numerical inverse method
• ISSN: 1547-7037; 1863-7345; 1934-7243
• DOI: 10.1007/s11669-017-0569-0

In this report, a combination of the diffusion multiple technique and the recently developed pragmatic numerical inverse method was employed for a high-throughput determination of interdiffusivity matrices in Co-Cr-FeMn-Ni high-entropy alloys (HEAs). Firstly, one face-centered cubic (fcc) quinary Co-Cr-Fe-Mn-Ni diffusion multiple at 1373 K was carefully prepared by means of the hot-pressing technique. Based on the composition profiles measured by the field emission electron probe micro analysis (FE-EPMA), the composition-dependent interdiffusivity matrices in quinary Co-Cr-Fe-Mn-Ni system at 1373 K were then efficiently determined using the pragmatic numerical inverse method. The determined interdiffusivities show good agreement with the limited results available in the literature. Moreover, the further comparison with the interdiffusivities in the lower-order systems indicates the sluggish diffusion effect in Co-Cr-Fe-Mn-Ni HEAs, which is however not observed in tracer diffusivities. In order for the convenience in further analysis, a generalized transformation relation among interdiffusivities with different dependent components in multicomponent systems was finally derived.