Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 32: Microstructure and Phase Transformations - detection methods

MM 32.4: Vortrag

Dienstag, 21. März 2017, 12:30–12:45, IFW B

The lattice strain in single-phase high-entropy alloys — •Junhee Han1, Pramote Thirathipviwat1,2, Jens Freudenberger1, Jozef Bednarcik3, Norbert Mattern1, and Thomas Gemming11IFW Dresden, PO Box 270116, D-01171 Dresden, Germany — 2TU Dresden, Institute of Materials Science, 01062 Dresden, Germany — 3DESY Photon Science, Notkestraße 85, 22607 Hamburg, Germany

The formation of single-phase solid solutions in high-entropy alloys (HEAs) consisting of multiple principal elements has led to the proposition that the lattices of HEAs must be severely distorted. Severe lattice distortion constitutes one of the key features characterizing high-entropy alloys and their enhanced mechanical properties. However, quantitative determination of the lattice distortions have only rarely been investigated. In order to address this issue, we employed means of X-ray diffraction (XRD) studies to investigate both long-range and atomic-scale distortions in the fcc-structured HEA and its binary, ternary and quaternary subsystems. The long-range and the local lattice strain were determined from the peak broadening analysis of X-ray diffraction and pair distribution functions (PDF). Particular attention is paid to the relative difference in the lattice distortions between the HEA and their subsystems including unary fcc-Ni. The HEA exhibited only slight changes in the long-range and local lattice strain compared to those of the subsystems. The results in this study indicate that the lattice strains in the equiatomic HEA is only slightly distorted away from the average fcc structure.

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