Transmission Electron Microscopy of Twins in 10M Martensite in Ni&amp;ndash;Mn&amp;ndash;Ga Ferromagnetic Shape Memory Alloy

Matsuda, Mitsuhiro; Yasumoto, Yoshihiro; Hashimoto, Kimiaki; Hara, Toru; Nishida, Minoru

doi:10.2320/matertrans.m2012002

Cited by 22 publications

(13 citation statements)

References 30 publications

(8 reference statements)

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“…It is seen that the atoms of variants A and D are in mirror symmetry with respect to the theoretical compound twin interface. Such a stepped structure of the compound twin interface has also been observed in various other shape memory alloys (Nishida et al, 1998;Ge et al, 2006;Matsuda et al, 2012). This should be correlated with the general observations that compound twins exhibit very small twinning/detwinning resistance (Nishida et al, 2008;Chulist et al, 2013).…”

Section: Figuresupporting

confidence: 76%

“…Unlike the type I twin interface, the type II twin possesses a High-resolution transmission electron micrographs of the three kinds of twin interfaces -type I (a), type II (b) and compound (c) twins -and the corresponding measured and simulated electron diffraction patterns. K I 1 , K II 1 and K Compd stepped structure outlined with the white solid lines, which could explain the irrational index of the type II twin interface (Liu & Xie, 2003;Nishida et al, 2008;Matsuda et al, 2012). The average interface, obtained by connecting the intersections of the stepped interface segments, should be the twinning plane of type II twin f1:1321 2 2:6038g M , as outlined with the white dashed line in Fig.…”

Section: Figurementioning

confidence: 95%

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Crystallographic insights into Ni–Co–Mn–In metamagnetic shape memory alloys

Yan

Zhang

et al. 2016

J Appl Cryst

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In the present work, the morphological and crystallographic features of the 6M modulated martensite in the Ni45Co5Mn37In13 alloy were investigated by electron backscatter diffraction and high‐resolution transmission electron microscopy (HRTEM) at room temperature. The 6M modulated martensite is in plate form and organized in colonies within which the plates stretch roughly in the same direction. Each colony has four types of orientation variants that are related to three kinds of twin relations, i.e. type I, type II and compound twins. The twinning shears of type I and type II twins are the same and equal to 0.2681, being about one order of magnitude higher than that of the compound twin (0.0330). Variant interfaces are microscopically defined by their corresponding twinning plane K1. The HRTEM investigations show that the interfaces of the type I twin are straight and coherent at atomic scale, whereas those of the type II and compound twins are `stepped'. The step height of the compound twin interfaces is much larger than that of the type II twin interfaces. In view of variant organization, there is only one oriented type I interface and one compound twin interface, but there are two oriented type II interfaces which have an angular deviation of ±5.32° with respect to the type I twin interface. The results of the present work provide comprehensive information on morphological and crystallographic features of Ni–Co–Mn–In metamagnetic shape memory alloys.

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Section: Figuresupporting

confidence: 76%

Section: Figurementioning

confidence: 95%

Crystallographic insights into Ni–Co–Mn–In metamagnetic shape memory alloys

Yan

Zhang

et al. 2016

J Appl Cryst

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“…At the nano-scale, the fine structure of the Type 1 and Type 2 interfaces was observed by HRTEM by Matsuda et al [49]. The results confirmed the assumption that the Type 2 interfaces are broader: while the periodic contrast from the structural modulations was clearly visible directly at the Type 1 interface, the contrast around the Type 2 interface was blurry and the interface itself appeared to be largely and randomly curved.…”

Section: Finer Structure Of the Mobile Interfacesupporting

confidence: 71%

Highly mobile interfaces in shape memory alloys

Seiner

2015

MATEC Web of Conferences

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Abstract. Macro-twin interfaces in single crystals of 10 M modulated Ni-Mn-Ga martensite have recently attracted a lot of attention due to the extraordinarily low twinning stress required to set them into motion; depending on the particular twinning mode, this stress can range between 0.05 and 1 MPa, and can be either strongly temperature dependent, or nearly temperature independent. The understanding to these effects is still not satisfactory, mainly due to the high complexity of these interfaces at the micro-scale (higher-order lamination) as well as at the atomistic scale (modulations of martensite). This paper brings a brief review of the recent experimental and theoretical achievements related to these highly mobile interfaces. The uniqueness of the behavior of 10 M martensite is shown by its comparison with other shape memory alloys with relatively low twinning stresses; then, this behavior is discussed in terms of its temperature dependence, strain rate dependence and the effect of the micromorphology of the interfaces.

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“…In Otsuka's notation, the B33 structure is represented as a 4O (orthorhombic) structure in terms of the number of stacking layers and the Bravais lattice [4]; we, therefore, refer the B33 structure as a 4O structure henceforth. Many martensitic phases have been reported to possess a long-period stacking-ordered (LPSO) structure, for example, 18R in Cu-Al alloys [5], 9R in Cu-Zn alloys [6], 7R (14 M) in Ni-Al [7] alloys, 10 M and 14 M in Ni-Mn-Ga alloys [8,9] and 18R in Ti-Pd [10] alloys. Variations of the LPSO structure in these alloys have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Novel long-period stacking-ordered structure of martensite in zirconium–cobalt–palladium alloys

Matsuda

Tomita

Tsurekawa

et al. 2015

Philosophical Magazine Letters

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A novel long-period stacking-ordered (LPSO) structure of a martensitic phase in a Zr-Co-Pd alloy was discovered and characterized by means of conventional transmission electron microscopy and high-angle annular dark-field scanning transmission electron microscopy. The new phase had a 6O structure and its lattice parameters were estimated to be a = 0.34, b = 0.45 and c = 1.53 nm. The formation mechanism and the space group of the LPSO structure are described.

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Transmission Electron Microscopy of Twins in 10M Martensite in Ni–Mn–Ga Ferromagnetic Shape Memory Alloy

Cited by 22 publications

References 30 publications

Crystallographic insights into Ni–Co–Mn–In metamagnetic shape memory alloys

Crystallographic insights into Ni–Co–Mn–In metamagnetic shape memory alloys

Highly mobile interfaces in shape memory alloys

Novel long-period stacking-ordered structure of martensite in zirconium–cobalt–palladium alloys

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