Highly mobile twin boundaries in seven-layer modulated Ni–Mn–Ga–Fe martensite. (15th March 2020)

• Record Type: Journal Article
• Authors: Sozinov, Alexei; Musiienko, Denys; Saren, Andrey; Veřtát, Petr; Straka, Ladislav; Heczko, Oleg; Zelený, Martin; Chulist, Robert; Ullakko, Kari
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 62
• Page End: 66
• Publication Date: 2020-03-15
• Subjects: Magnetic shape memory -- Martensite -- Twin boundary -- Ni–Mn–Ga -- Heusler alloy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.10.042
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We report on low twinning stress of 0.2 MPa for type 1 twin boundaries with rational (101) twinning plane and 0.1 MPa for type 2 twin boundaries with rational [ 1 ¯ 01] twinning direction, in Ni2 MnGa0.8 Fe0.2 seven-layer modulated martensite exhibiting about 12% stress-induced strain. The studied samples were free of compound twins with (100) and (110) twinning planes. The martensite lattice is monoclinic and shows a long-period commensurate modulation with wave vector q = (2/7) g 110, where g 110 is the reciprocal lattice vector. The investigated alloy has high potential for practical applications due to the low twinning stress and the elevated Curie point T C =400 K. Graphical abstract: Image, graphical abstract