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Phase-field modelling of paramagnetic austenite–ferromagnetic martensite transformation coupled with mechanics and micromagnetics

Ohmer, Dominik ; Yi, Min ; Gutfleisch, Oliver ; Xu, Bai-Xiang (2023):
Phase-field modelling of paramagnetic austenite–ferromagnetic martensite transformation coupled with mechanics and micromagnetics. (Postprint)
In: International Journal of Solids and Structures, 238, Elsevier, ISSN 0020-7683,
DOI: 10.26083/tuprints-00021033,
[Article]

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Item Type: Article
Origin: Secondary publication
Status: Postprint
Title: Phase-field modelling of paramagnetic austenite–ferromagnetic martensite transformation coupled with mechanics and micromagnetics
Language: English
Abstract:

A three-dimensional phase-field model is proposed for simulating the magnetic martensitic phase transformation. The model considers a paramagnetic cubic austenite to ferromagnetic tetragonal martensite transition, as it occurs in magnetic Heusler alloys like Ni2 MnGa, and is based on a Landau 2-3-4 polynomial with temperature dependent coefficients. The paramagnetic–ferromagnetic transition is recaptured by interpolating the micromagnetic energy as a function of the order parameter for the ferroelastic domains. The model is numerically implemented in real space by finite element (FE) method. FE simulations in the martensitic state show that the model is capable to correctly recapture the ferroelastic and -magnetic microstructures, as well as the influence of external stimuli. Simulation results indicate that the paramagnetic austenite to ferromagnetic martensite transition shifts towards higher temperatures when a magnetic field or compressive stress is applied. The dependence of the phase transition temperature shift on the strength of the external stimulus is uncovered as well. Simulation of the phase transition in magnetocaloric materials is of high interest for the development of energy-efficient magnetocaloric cooling devices.

Journal or Publication Title: International Journal of Solids and Structures
Volume of the journal: 238
Place of Publication: Darmstadt
Publisher: Elsevier
Collation: 36 Seiten
Uncontrolled Keywords: phase-field model, micromagnetics, first-order phase transition
Classification DDC: 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften
500 Naturwissenschaften und Mathematik > 530 Physik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
Date Deposited: 04 Aug 2022 11:34
Last Modified: 04 Aug 2022 11:34
DOI: 10.26083/tuprints-00021033
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-210333
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21033
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