%0 journal article
%@ 1438-1656
%A Chulist, R., Pagounis, E., Czaja, P., Schell, N., Brokmeier, H.

%D 2021
%J Advanced Engineering Materials
%N 11
%P 2100131 
%R doi:10.1002/adem.202100131
%T New Insights into the Intermartensitic Transformation and Over 11% Magnetic Field-Induced Strain in 14 m Ni−Mn−Ga Martensite
%U https://doi.org/10.1002/adem.202100131
11 
%X Stress-induced intermartensitic phase transformation from 10 m to 14 m modulated martensite structure is characterized in Ni50.5−Mn28.9−Ga20.6 at% single crystals, with particular focus on periodic atomic shuffling by in situ synchrotron radiation diffraction. Under compression, along the [001] direction, at 6 MPa, the self-accommodated 10 m single crystal is found to transform to a nearly single-variant state. Further stress increase up to 20 MPa triggers intermartensitic transformation to an intermediate, mixed martensite state. Intermartensitic transformation is hereby invoked at a considerably lower stress than previously reported for Ni−Mn−Ga alloys. However, the stress level applied along the [001] direction does not promote the complete 10 m→14 m martensite transformation. The 14 m structure is then fully achievable, when a consecutive compression along the [100] direction is applied. Such mechanically promoted 14 m single crystals are stable at room temperature and yield about 11.4% magnetic-field induced strain—being the highest noted up to date for the Ni−Mn−Ga system.