TY - JOUR

T1 - Structural and superelastic properties of Fe–Mn–Al–Ni shape memory alloy sheets produced on industrial process routes by hot rolling

AU - Bauer, André

AU - Vollmer, Malte

AU - Viebranz, Vincent Fabian

AU - Maier, Hans Jürgen

AU - Niendorf, Thomas

N1 - Funding Information: Financial support by Deutsche Forschungsgemeinschaft (project number 401738767) is gratefully acknowledged. The material was processed by thyssenkrupp Steel Europe AG (Duisburg, Germany).

PY - 2023/5

Y1 - 2023/5

N2 - In the present study the structural and functional properties of Fe–Mn–Al–Ni shape memory alloy sheets produced on an industrial process route focusing on hot rolling were investigated. The as-processed condition is characterized by a high fraction of the non-transforming γ-phase, which ensures good workability, but is associated with poor superelasticity. The alloy shows good structural properties with a yield strength of about 600 MPa, which is well above the usual transformation stress related to the martensitic phase transformation for the investigated alloy composition. After solution annealing, a microstructure showing no preferred orientation being characterized by distinctly larger grains is present. The results obtained reveal that the previous thermo-mechanical processing had no impact on the subsequent texture, however, provided a sufficient amount of driving force for abnormal grain growth. Imposed by a cyclic heat treatment, oligocrystalline structures with grain sizes above 10 mm can be achieved in the industrially processed material, which show superelastic properties similar to material processed in small batches in the laboratory.

AB - In the present study the structural and functional properties of Fe–Mn–Al–Ni shape memory alloy sheets produced on an industrial process route focusing on hot rolling were investigated. The as-processed condition is characterized by a high fraction of the non-transforming γ-phase, which ensures good workability, but is associated with poor superelasticity. The alloy shows good structural properties with a yield strength of about 600 MPa, which is well above the usual transformation stress related to the martensitic phase transformation for the investigated alloy composition. After solution annealing, a microstructure showing no preferred orientation being characterized by distinctly larger grains is present. The results obtained reveal that the previous thermo-mechanical processing had no impact on the subsequent texture, however, provided a sufficient amount of driving force for abnormal grain growth. Imposed by a cyclic heat treatment, oligocrystalline structures with grain sizes above 10 mm can be achieved in the industrially processed material, which show superelastic properties similar to material processed in small batches in the laboratory.

KW - Abnormal grain growth

KW - FeMnAlNi

KW - Industrial process route

KW - Martensitic phase transformation

KW - Mechanical properties

KW - Shape memory alloy

UR - http://www.scopus.com/inward/record.url?scp=85158842070&partnerID=8YFLogxK

U2 - 10.1016/j.jmrt.2023.04.260

DO - 10.1016/j.jmrt.2023.04.260

M3 - Article

AN - SCOPUS:85158842070

VL - 24

SP - 6982

EP - 6991

JO - Journal of Materials Research and Technology

JF - Journal of Materials Research and Technology

SN - 2238-7854

ER -