Compositional complexity dependence of dislocation density and mechanical properties in high entropy alloy systems

Thirathipviwat P, Song G, Bednarcik J, Kuehn U, Gemming T, Nielsch K, Han J (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Progress in Natural Science Elsevier

Book Volume: 30

Pages Range: 545-551

Journal Issue: 4

DOI: 10.1016/j.pnsc.2020.07.002

Abstract

This study focuses on a quantitative analysis of dislocation accumulation after cold plastic deformation and mechanical properties of FeNiCoCrMn and TiNbHfTaZr high entropy alloys (HEAs) which are single phase fcc and bcc solid solutions, respectively. In order to study the role of compositional complexity from unary to quinary compositions on dislocation accumulation and mechanical properties after plastic deformation, the single solid solution phase forming sub-alloys of the two HEAs were investigated. All studied samples revealed a large plastic deformability under cold-rotary swaging process by 85–90% area reduction without intermediate annealing. The dislocation density of all studied samples, determined by Williamson-Hall method on synchrotron X-ray diffraction patterns, were between 10¹⁴ - 10¹⁵ m⁻² dependent on the alloy composition. The level of dislocation density after plastic deformation is not only affected by the number of constituent element but the lattice distortion and intrinsic properties in terms of stacking fault energy, modulus misfit, and melting point also impact the dislocation storage. The level of dislocation density determines the level of mechanical properties because of a resistance to dislocation motions. The hardness and yield compressive strength of the studied samples are proportional to the level of dislocation density.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden

Germany (DE) Kongju National University

Korea, Republic of (KR) Pavol Jozef Šafárik University in Kosice / Univerzita Pavla Jozefa Šafárika v Košiciach

Slovakia (SK)

How to cite

APA:

Thirathipviwat, P., Song, G., Bednarcik, J., Kuehn, U., Gemming, T., Nielsch, K., & Han, J. (2020). Compositional complexity dependence of dislocation density and mechanical properties in high entropy alloy systems. Progress in Natural Science, 30(4), 545-551. https://doi.org/10.1016/j.pnsc.2020.07.002

MLA:

Thirathipviwat, P., et al. "Compositional complexity dependence of dislocation density and mechanical properties in high entropy alloy systems." Progress in Natural Science 30.4 (2020): 545-551.

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