Session: 02-02: Performance of Shape Memory Alloys

Paper Number: 90911

90911 - A Thermodynamically-Informed Phase-Field Model to Study the Martensite Formation in a Novel Type of Iron-Based Sma 

This work is motivated by a new generation of iron-based shape memory alloys (SMA) that have the potential to serve as an enabling technology in civil engineering applications, such as novel prestressing mechanisms and high-fiber content reinforced high performance concrete.

To this end, we present a multidisciplinary effort between mechanics and materials science oriented thermodynamics to carefully study the martensitic phase transformation in the quaternary Fe–Mn–Al–Ni alloy system. More specifically, an Allen-Cahn-type phase-field model is used to describe the martensite formation in this shape memory alloy, which is based on the micromechanical interplay of B2-ordered precipitates and the matrix material, cf. [1]. The underlying multiphase approach, cf. [2, 3], is transformed into a homogenized dual phase description with the aim of approximating its martensite start temperature. The calibration of all phase-field related model parameters is performed by means of temperature-dependent data provided through CALPHAD computations. Three-dimensional, spatially and temporally fully-resolved finite element simulations are performed on topologically varied representative volume elements, in order to assess the modeling approach.

References:

[1] Walnsch, A., Leineweber, A., Kriegel, M. J., Motylenko, M., Korpala, G., Prahl, U., Thermo-
dynamics of martensite formation in Fe–Mn–Al–Ni shape memory alloys, Scripta Materialia
192:26–31, 2021.
[2] Levitas, V. I., Preston, D. L., Three-dimensional Landau theory for multivariant stress-induced
martensitic phase transformations. I. Austenite↔martensite, Physical Review B 66(13):134206,
2002.
[3] Tůma, K., Stupkiewicz, S., Petryk, H., Size effects in martensitic microstructures: Finite-strain
phase field model versus sharp-interface approach, Journal of Mechanics and Physics of Solids
95:284–307, 2016.

Presenting Author: Bjoern Kiefer TU Bergakademie Freiberg