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05.12.2019 | ICFSMA 2019 | Ausgabe 1/2020

Shape Memory and Superelasticity 1/2020

The Effect of Local Arrangement of Excess Mn on Phase Stability in Ni–Mn–Ga Martensite: An Ab Initio Study

Zeitschrift:
Shape Memory and Superelasticity > Ausgabe 1/2020
Autoren:
Martin Zelený, Martin Heczko, Jozef Janovec, David Holec, Ladislav Straka, Oleg Heczko
Wichtige Hinweise
This article is an invited submission to Shape Memory and Superelasticity selected from presentations at the International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA) held June 2–7, 2019 in Prague, Czech Republic, and has been expanded from the original presentation.

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Abstract

The effect of excess Mn on the stability of modulation and elastic properties was investigated using ab initio electronic structure calculations in Ni–Mn–Ga magnetic shape memory alloy. We used the structure of four layered modulated martensite known as 4O to describe modulation of the martensitic lattice. We found that elastic properties of stoichiometric 4O martensite are very similar to elastic properties of 10M martensite reported in previous calculations. The modulated structure becomes less stable than nonmodulated martensite above 3 at.% of excess Mn which corresponds very well to experimental observation at low temperature. Elastic properties of NM martensite are not significantly affected by Mn content nor local arrangements of Mn-excess atoms. We also found that Mn-excess atoms prefer occupation of distant positions for low Mn-excess composition. The occupation of closest position is preferred for alloys with higher content of Mn.

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