Journal
SCRIPTA MATERIALIA
Volume 144, Issue -, Pages 52-55Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.09.046
Keywords
Heusler phases; Martensite; Ferromagnetic shape memory alloy; Magnetic shape memory; Twinning
Categories
Funding
- Academy of Finland [277996]
- Finnish Cultural Foundation [12172118]
- Czech Science Foundation [16-00043S]
- Ministry of Education, Youth and Sports (Czech Republic) [CZ.02.1.01/0.0/0.0/15_003/0000487 - MATFUN]
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We study compositional and thermal dependences of lattice parameters and twinning stress sigma(TW) in Ni50-xMn25-yGa25-zCoxCuy+z magnetic shape memory alloys with non-modulated tetragonal crystal structure. The sigma(TW) was found to decrease with increasing temperature with a slope from -0.0076 to -0.0181 MPa/K. The sigma(TW) = 0.47-0.81 MPa values measured near composition-specific austenite transformation temperatures T-A were discovered to depend linearly on the c/a ratio with a slope of 14 MPa. We predict that the further decrease of c/a ratio to the level of 1.085-1.104 can result in extremely low sigma(TW) approximate to 0.1 MPa in non-modulated martensite. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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