On the effect of gamma phase formation on the pseudoelastic performance of polycrystalline Fe–Mn–Al–Ni shape memory alloys

[Display omitted] In recent years, iron-based shape-memory-alloys such as Fe–Mn–Al–Ni came into focus, due to superior pseudoelastic performance and concomitantly low costs of the alloying elements. The formation of the ductile γ-phase in polycrystalline Fe–Mn–Al–Ni and its impact on the pseudoelast...

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Bibliographic Details
Published in:Scripta materialia 2015-11, Vol.108, p.23-26
Main Authors: Vollmer, M., Segel, C., Krooß, P., Günther, J., Tseng, L.W., Karaman, I., Weidner, A., Biermann, H., Niendorf, T.
Format: Article
Language:English
Subjects:
Formations
Grain boundaries
Low cost
Mechanical properties
Microstructure
Precipitation
Pseudoelasticity
Quenching
Recoverability
Shape memory alloys (SMAs)
Strain
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Summary:[Display omitted] In recent years, iron-based shape-memory-alloys such as Fe–Mn–Al–Ni came into focus, due to superior pseudoelastic performance and concomitantly low costs of the alloying elements. The formation of the ductile γ-phase in polycrystalline Fe–Mn–Al–Ni and its impact on the pseudoelastic performance have not been addressed, yet. Based on modification of quenching conditions this study shows that controlled γ-phase precipitation at grain boundaries can suppress intergranular cracking without affecting pseudoelasticity. In situ incremental strain tests revealed good recoverability up to about 8% strain.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.06.013