Martensite stabilisation in single crystalline Ni-Mn-Ga and Ni-Mn-Sn magnetic shape memory alloys

Martensite stabilisation in single crystalline Ni-Mn-Ga and Ni-Mn-Sn magnetic shape memory alloys

•Martensite is stabilized mechanically in Ni-Mn-Ga and Ni-Mn-Sn.•Degree of stabilization differs between Ni-Mn-Ga and Ni-Mn-Sn.•Twinning stress affects transformation morphology.•Multiple site nucleation is favoured in Ni-Mn-Sn.•Planar phase front movement in Ni-Mn-Ga. Martensite stabilization in Ni...

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Veröffentlicht in:Materials letters 2018-11, Vol.230, p.266-269
Hauptverfasser: Chulist, R., Czaja, P., Tokarski, T., Faryna, M.
Format: Artikel
Sprache:eng
Schlagworte:
Habit plane
Manganese
Martensite
Martensitic transformation
Martensitic transformations
Materials science
Mechanical properties
Microstructure
Morphology
Nickel
Shape memory alloys
Single crystals
SME
Stabilization
Twinning
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Beschreibung
Zusammenfassung:•Martensite is stabilized mechanically in Ni-Mn-Ga and Ni-Mn-Sn.•Degree of stabilization differs between Ni-Mn-Ga and Ni-Mn-Sn.•Twinning stress affects transformation morphology.•Multiple site nucleation is favoured in Ni-Mn-Sn.•Planar phase front movement in Ni-Mn-Ga. Martensite stabilization in Ni-Mn-Ga and Ni-Mn-Sn single crystals was induced by mechanical training. The degree of stabilization differs between Ni-Mn-Ga and Ni-Mn-Sn (ΔT = 28 K), what is attributed to a disparity in the twinning stress affecting also transformation morphology. Upon martensitic transformation multiple site nucleation is favoured by a larger twinning stress in Ni-Mn-Sn in contrast to a planar phase front movement in Ni-Mn-Ga.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.07.140