Ab initio study of properties of Co- and Cu- doped Ni-Mn-Ga alloys

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Interna författare/redaktörer


Publikationens författare: M. Zelený, A. Sozinov, T. Björkman, L. Straka, R. M. Nieminen
Publiceringsår: 2015
Tidskrift: Materials Today: Proceedings
Förläggare: Elsevier
Moderpublikationens namn: International Conference on Martensitic Transformations, ICOMAT-2014
Volym: 2
Artikelns första sida, sidnummer: S601
Artikelns sista sida, sidnummer: S604


Abstrakt


The influence of Co and Cu doping on Ni-Mn-Ga alloy is investigated using the first-principles exact muffin-tin orbital method in combination with the coherent-potential approximation. The energy difference between the austenite (A) and the nonmodulated (NM) martensite ΔEA-NM depends linearly on the Cu concentration and distribution, with a minimum for all Cu at Mn sites and a maximum for all Cu at Ga sites. For alloys simultaneously doped by Co in Ni sublattice and Cu in Mn or Ga sublattice, the effects of the individual dopants on ΔEA-NM and (c/a)NM and are almost independent. The alloy with composition Ni46Co4Mn24Ga22Cu4 exhibits decreased equilibrium (c/a)NM and increased ΔEA-NM in comparison with Ni50Mn25Ga25, which is in agreement with the previous experimental results.

Senast uppdaterad 2019-23-07 vid 05:53