Suppression of γ phase and its effect on mechanical behavior of melt-spun and annealed Ni–Mn–Ga high-temperature shape memory alloys

Dai, Yanchao; Czaja, Paweł; Chulist, R.; Wójcik, Anna; Hou, Long; Ren, Zhongming; Xi, Li

doi:10.1016/j.mtcomm.2020.101165

Materials Today Communications

2020

DOI: 10.1016/j.mtcomm.2020.101165

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Suppression of γ phase and its effect on mechanical behavior of melt-spun and annealed Ni–Mn–Ga high-temperature shape memory alloys

Yanchao Dai

Paweł Czaja

R. Chulist

et al.

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2024

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Shear Deformation of Non-modulated Ni2MnGa Martensite: An Ab Initio Study

Heczko,

Šesták,

Seiner

et al. 2024

Shap. Mem. Superelasticity

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The impact of shear deformation in $$(101)[10\overline{1}]$$ ( 101 ) [ 10 1 ¯ ] system of non-modulated (NM) martensite in Ni2MnGa ferromagnetic shape memory alloy is investigated by means of ab initio atomistic simulations. The shear system is associated with twinning of NM lattice and intermatensitic transformation to modulated structures. The stability of the NM lattice increases with increasing content of Mn. The most realistic shear mechanism for twin reorientation can be approximated by the simple shear mechanism, although the lowest barriers were calculated for pure shear mechanism. The energy barrier between twin variants further reduces due to spontaneous appearance of lattice modulation or, in other words, the nanotwins with thickness of two atomic planes. Such nanotwins appear also on the generalized planar fault energy (GPFE) curve calculated using a newly developed advanced procedure and exhibits even lower energy than the defect free NM structure. These nanotwin doublelayers are also basic building blocks of modulated structures and play an important role in intermartensitic transformation.

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Shear Deformation of Non-modulated Ni2MnGa Martensite: An Ab Initio Study

Heczko,

Šesták,

Seiner

et al. 2024

Shap. Mem. Superelasticity

View full text Add to dashboard Cite

show abstract

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Suppression of γ phase and its effect on mechanical behavior of melt-spun and annealed Ni–Mn–Ga high-temperature shape memory alloys

Cited by 1 publication

References 30 publications

Shear Deformation of Non-modulated Ni2MnGa Martensite: An Ab Initio Study

Shear Deformation of Non-modulated Ni2MnGa Martensite: An Ab Initio Study

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