Asymmetric distribution of martensitic variants in non-modulated NiMnGa single crystals
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A strong asymmetric distribution of martensitic variants in non-modulated NiMnGa single crystals with respect to austenite is produced during martensitic transformation. A cubic-to-tetragonal transformation occurs with 24 possible variants divided into two groups. The first group with a misorientation of about 6° is composed of the so-called major variants separated by inter-plate boundaries, while the latter comprises minor variants with misorientation of 12.2°. The 6° rotation associated with major variants can also be observed at each inclination point where conjugation boundaries (CBs) occurs. The removal of CBs straightens out the inclined inter-plate boundaries confirming the Müllner–King mechanism.
KeywordsAustenite Martensite Martensitic Transformation Shape Memory Alloy Orientation Relationship
The work was carried out within the Homing Plus Program (Project 2013-8/3) of Foundation for Polish Science, co-financed from European Union, Regional Development Fund. The financial support by the Ministry of Science and Higher Education of Poland within the Project No. 0063/IP2/2015/73 is also acknowledged.
- 1.Bhattacharya K (2013) Microstructure of martensite: why it forms and how it gives rise to the shape-memory effect. Oxford University Press, New YorkGoogle Scholar
- 2.Bain EC (1924) The nature of martensite. Trans AIME 70:25–35Google Scholar
- 3.Kurdjumov G, Sachs G (1930) Über den mechanismus der stahlhärtung. Z Phys 63:225–243Google Scholar
- 4.Nishiyama Z (1930) X-ray investigation of the mechanism of the transfomation from faced-centered cubic lattice to body centred cubic. Sci Rep Tohoku Imp Univ 23:1934–1935Google Scholar
- 5.Wassermann G (1933) Archiv für das Eisenhüttenwesen 16:647–649Google Scholar
- 8.Christian JW (1965) The theory of transformations in metals and alloys. Pergamon Press, OxfordGoogle Scholar
- 18.Szczerba MJ (2015) Non-modulated martesite microstructure with internal nanotwins in NiMnGa alloys. Arch Metall Mater 60:2267–2270Google Scholar