Transitions Between Austenite and Martensite Structures in Ni 50Mn 25Ga 20Fe 5 Thin Foil

31 Pages Posted: 26 Mar 2021

See all articles by Yanling Ge

Yanling Ge

FZU - Institute of Physics of the Czech Academy of Sciences

Ladislav Straka

FZU - Institute of Physics of the Czech Academy of Sciences; Charles University in Prague - Faculty of Mathematics and Physics

Marek Vronka

FZU - Institute of Physics of the Czech Academy of Sciences; Carnegie Mellon University - Department of Materials Science and Engineering

Alexei Sozinov

LUT University - Material Physics Laboratory

Oleg Heczko

FZU - Institute of Physics of the Czech Academy of Sciences; Charles University in Prague - Faculty of Mathematics and Physics

Abstract

Using common and high resolution transmission electron microscopy, we study the evolution of crystal structure with increasing thickness in a thin Ni50Mn25Ga20Fe5 foil. Iron alloying enables to observe the complete spectrum of known martensitic phases and respective transitions simultaneously. Starting from cubic austenite at about 30 nm foil thickness, the structure evolves via interleaved stripes of austenite and five-layered modulated 10M martensite to pure 10M phase with low density of stacking faults. With increasing thickness the 10M phase transforms gradually to seven-layered modulated 14M by increasing density of stacking faults. Finally the non-modulated tetragonal NM phase appears within the 14M phase by detwinning of nanotwins. We found large local variation of lattice parameters, which is ascribed to elastically very soft austenite and 10M phase and faulty 14M lattice. Our experiments show clearly that nanotwinning and stacking faults are inherent structure features tightly connected with lattice modulation and intermartensite transformations. This is important finding in broader attempt to bridge the gap between the nanotwinning and modulation period development with temperature and composition. From the application point of view, the observed instability of modulation or of particular phases in thin films imposes certain limits on the use of material on microscale.

Keywords: Structural modulation; Austenite-to-martensite phase transformation; Nanotwins; HRTEM; Ni-Mn-Ga-Fe

Suggested Citation

Ge, Yanling and Straka, Ladislav and Vronka, Marek and Sozinov, Alexei and Heczko, Oleg, Transitions Between Austenite and Martensite Structures in Ni 50Mn 25Ga 20Fe 5 Thin Foil. Available at SSRN: https://ssrn.com/abstract=3813433 or http://dx.doi.org/10.2139/ssrn.3813433

Yanling Ge

FZU - Institute of Physics of the Czech Academy of Sciences

Narodni 3, 111 42
Prague, 11720
Czech Republic

Ladislav Straka (Contact Author)

FZU - Institute of Physics of the Czech Academy of Sciences ( email )

Narodni 3, 111 42
Prague, 11720
Czech Republic

Charles University in Prague - Faculty of Mathematics and Physics ( email )

Sokolovska 83
Prague, 186 75
Czech Republic

Marek Vronka

FZU - Institute of Physics of the Czech Academy of Sciences ( email )

Narodni 3, 111 42
Prague, 11720
Czech Republic

Carnegie Mellon University - Department of Materials Science and Engineering ( email )

5000 Forbes Avenue
Wean Hall 3325
Pittsburgh, PA 15213
United States

Alexei Sozinov

LUT University - Material Physics Laboratory ( email )

Oleg Heczko

FZU - Institute of Physics of the Czech Academy of Sciences

Narodni 3, 111 42
Prague, 11720
Czech Republic

Charles University in Prague - Faculty of Mathematics and Physics

Sokolovska 83
Prague, 186 75
Czech Republic

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