Carolina Baruffi¹, Francesco Maresca^2*, William Curtin^1,3*

1 Laboratory for Multiscale Mechanics Modeling, École Polytechnique Fédérale de Lausanne (EPFL), CH-1951 Sion, Valais, Switzerland

2 Faculty of Science and Engineering, University of Groningen, PO Box 72, 9700 AB Groningen, The Netherlands

3 Faculty of Engineering, Brown University, Providence, RI 02912, USA

* Corresponding authors emails: f.maresca@rug.nl, William_Curtin@brown.edu

DOI10.24435/materialscloud:p6-za [version v1]

Publication date: Nov 04, 2022

How to cite this record

Carolina Baruffi, Francesco Maresca, William Curtin, Screw vs. edge dislocation strengthening in body-centered-cubic high entropy alloys and implications for guided alloy design, Materials Cloud Archive 2022.137 (2022), https://doi.org/10.24435/materialscloud:p6-za

Description

Body-centered-cubic (BCC) high entropy alloys (HEAs) can show exceptionally high strength up to high temperatures. Mechanistic theories are needed to guide alloy discovery within the immense multicomponent HEA compositional space. Here, two new theories for strengthening as controlled by screw and edge dislocations, respectively, are applied to predict the yield stresses of a range of BCC alloys over a wide range of temperatures. Results show that the screw theory, with one fitting parameter, can capture experiments in many dilute and non-dilute alloys while the parameter-free edge theory agrees with experiments in non-dilute alloys having a sufficiently large misfit parameter. These results indicate a transition in single-phase alloy strengthening from traditional screw dominance to edge dominance with increasing misfit that is enabled in complex non-dilute alloys. These results point to the use of the edge theory to guide design of high-temperature alloys in the non-dilute range.

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Keywords

BCC High Entropy Alloys Solute Strengthening Alloy Discovery