Branched needle microstructure in Ni-Mn-Ga 10M martensite: EBSD study. (15th April 2017)

• Record Type: Journal Article
• Authors: Chulist, R.; Straka, L.; Sozinov, A.; Tokarski, T.; Skrotzki, W.
• Is Part Of: Acta materialia. Volume 128(2017)
• Page Start: 113
• Page End: 119
• Publication Date: 2017-04-15
• Subjects: EBSD -- NiMnGa -- Pseudoelasticity -- Twinning; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2017.02.024
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Interaction of conjugate twin boundaries under applied stress was studied using electron backscatter diffraction in the scanning electron microscope. Compression and unloading resulted in a recoverable strain. EBSD maps and BSE images reveal a branched needle microstructure inside and outside the central triangle domain. Type I twin boundaries are mostly observed inside the central domain while some type II twin boundaries can be predominantly detected outside. Moreover, a characteristic branching of modulation domains close to the intersection of conjugate boundaries is observed. A mechanism of twin annihilation based on the rigid body rotation is proposed. The shape and distribution of stress-induced twins is explained by minimizing of elastic energy. Graphical abstract: Image