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Phase stability and magnetic behavior of FeCrCoNiGe high-entropy alloy
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
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2015 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 107, no 25Article in journal (Refereed) Published
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Text
Abstract [en]

We report an alternative FeCrCoNiGe magnetic material based on FeCrCoNi high-entropy alloy with Curie point far below the room temperature. Investigations are done using first-principles calculations and key experimental measurements. Results show that the equimolar FeCrCoNiGe system is decomposed into a mixture of face-centered cubic and body-centered cubic solid solution phases. The increased stability of the ferromagnetic order in the as-cast FeCrCoNiGe composite, with measured Curie temperature of 640 K, is explained using the exchange interactions.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. Vol. 107, no 25
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-181815DOI: 10.1063/1.4938398ISI: 000368442100017Scopus ID: 2-s2.0-84952683248OAI: oai:DiVA.org:kth-181815DiVA, id: diva2:901933
Funder
Swedish Research CouncilVINNOVA, 2014-03374
Note

QC 20160209. QC 20160216

Available from: 2016-02-09 Created: 2016-02-05 Last updated: 2017-11-30Bibliographically approved
In thesis
1. Theoretical Investigations of High-Entropy Alloys
Open this publication in new window or tab >>Theoretical Investigations of High-Entropy Alloys
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

High-entropy alloys (HEAs) are composed of multi-principal elements with equal or near-equal concentrations, which open up a vast compositional space for alloy design. Based on first-principle theory, we focus on the fundamental characteristics of the reported HEAs, as well as on the optimization and prediction of alternative HEAs with promising technological applications.

The ab initio calculations presented in the thesis confirm and predict the relatively structural stability of different HEAs, and discuss the composition and temperature-induced phase transformations. The elastic behavior of several HEAs are evaluated through the single-crystal and polycrystalline elastic moduli by making use of a series of phenomenological models. The competition between dislocation full slip, twinning, and martensitic transformation during plastic deformation of HEAs with face-centered cubic phase are analyzed by studying the generalized stacking fault energy. The magnetic moments and magnetic exchange interactions for selected HEAs are calculated, and then applied in the Heisenberg Hamiltonian model in connection with Monte-Carlo simulations to get further insight into the magnetic characteristics including Curie point. The Debye-Grüneisen model is used to estimate the temperature variation of the thermal expansion coefficient.

This work provides specific theoretical points of view to try to understand the intrinsic physical mechanisms behind the observed complex behavior in multi-component systems, and reveals some opportunities for designing and optimizing the properties of materials

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 35
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-218162 (URN)978-91-7729-544-0 (ISBN)
Presentation
2017-11-15, konferensrummet, Brinellvägen 23, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20171127

Available from: 2017-11-27 Created: 2017-11-23 Last updated: 2017-11-27Bibliographically approved

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