Detwinning of a non-modulated Ni–Mn–Ga martensite: From self-accommodated microstructure to single crystal

Szczerba, M.J.; Chulist, R.

doi:10.1016/j.actamat.2014.11.008

Cited by 41 publications

(21 citation statements)

References 27 publications

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“…3c). This is consistent with the literature, where it is found that microstructure reorientation during loading initiates with first detwinning of internal twins [27,36]. It is also evident from EBSD measurement that larger plates more favourably oriented with respect to the applied load grow at the expense of the less favourably oriented ones as is also visible from the misorientation angle profile (Fig.…”

Section: Resultssupporting

confidence: 81%

“…It is demonstrated that like most MSMA, Ni 50 Mn 37.5 Sn 12.5 single crystal is not free from an internal sublamellar structure of fine twins resembling the typical ''twins within twins'' microstructure [10]. This is further in line with more recent reports [27], showing that during the training process, the initial detwinning of these fine twins within each misoriented macro-lamella is critical for the adjacent macrolamellae to subsequently attain twin relation, what thereafter enables continued detwinning until the allowed limit.…”

Section: Introductionsupporting

confidence: 78%

“…It also shows coarsening while moving from the top near IPB to the inner part of the lamellae. For a more thorough study of CB and the proposed mechanism for its removal under compression, see [20,27,33].…”

Section: Resultsmentioning

confidence: 99%

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Self-accommodated and pre-strained martensitic microstructure in single-crystalline, metamagnetic Ni–Mn–Sn Heusler alloy

et al. 2017

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Metamagnetic shape memory alloys are a unique class of materials capable of large magnetic field-induced strain due to reverse martensitic phase transformation. A precondition for large shape change is martensite deformation, which heavily depends on microstructure. Elucidation of microstructure is therefore indispensable for strain control and deformation mechanics in such systems. The current paper reports on a self-accommodated martensitic microstructure in metamagnetic Ni 50 Mn 37.5 Sn 12.5 single crystal. The microstructure here is hierarchically organised at three distinct levels. On a large scale, martensite plate colonies, distinguished by intercolony boundaries, group individual martensitic plates. Plates are separated by interplate boundaries and deviate by 2.2°from an ideal twin relation. On the lower scale, plates are composed of subplate twins. Conjugation boundaries separating two pairs of twins arise in relation to a subplate microstructure. Modulation boundaries separating two variants with perpendicular modulation directions and with parallel c-axes also appear. Mechanical training frees larger plates from fine subplate microtwins bringing macro-lamellae into twin relation, what then permits further detwinning until a single variant state.

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Section: Resultssupporting

confidence: 81%

Section: Introductionsupporting

confidence: 78%

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Self-accommodated and pre-strained martensitic microstructure in single-crystalline, metamagnetic Ni–Mn–Sn Heusler alloy

et al. 2017

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“…2e). Most importantly, the martensite plates in the lamellar structure are not twin related [14]. A consequence of this finding is that detwinning modes, responsible as has been lately shown for deformation of such a martensite structure [15,16], cannot change one martensite plate into another.…”

Section: Resultsmentioning

confidence: 91%

“…Recent in-situ straining of NM Ni-Mn-Ga shows that the deformation process in Ni-Mn-Ga alloys is governed by detwinning at the nanoscale level changing one region of nanotwins into another [14][15][16]. The full crystallographic description of deformation detwinning in Ni-Mn-Ga single crystals performed by means of the correspondence matrix method can be found in [20].…”

Section: Resultsmentioning

confidence: 99%

Non-Modulated Martensite Microstructure With Internal Nanotwins In Ni-Mn-Ga Alloys

Szczerba¹

2015

Archives of Metallurgy and Materials

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The self-accommodated non-modulated martensite of Ni-Mn-Ga single crystal was studied by transmission and scanning electron microscopy in the latter case using the electron backscatter diffraction technique. Three kinds of interfaces existing at different length scales were reported. The first, is the wavy and incoherent interface separating martensite variants observed on the micro-level with no-common crystallographic plane between them. The second is within a single martensite plate where the lattice rotates around one of the {110} pole to accommodate the interfacial curvature between martensite plates. Finally, at the nanoscale the third interface exists, a twin boundary separating internal nanotwins with the {112} type habit plane.Keywords: shape memory alloys; martensite; Ni-Mn-Ga single crystals; interface W pracy przeprowadzono obserwacje mikrostruktury monokryształu Ni-Mn-Ga charakteryzujący się nie-modulowaną strukturą martenzytyczną. Badania przeprowadzono z wykorzystaniem techniki transmisyjnej oraz skaningowej mikroskopii elektronowej. W przypadku drugiej metody zastosowano technikę elektronów wstecznie rozproszonych. Trzy rodzaje granic zostały zaobserwowane oraz opisane. Pierwsza granica jest niekoherentna i występuje w skali mikro pomiędzy płytkami martenzytu, które nie posiadają wspólnej płaszczyzny krystalograficznej o niskich indeksach Millera. Kolejna granica występuje wewnątrz pojedynczej płytki martenzytycznej, której towarzyszy rotacja sieci krystalicznej wokół kierunku {110} obszarów przedzielonych tą granicą w celu akomodacji wygięć granicy występującej między płytkami. W skali nanometrycznej można zaobserwować kolejną granicę równoległą do płaszczyzny krystalograficznej {112} (płaszczyzna bliźniacza), która rozdziela płytki nanobliźniaków.

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Adaptive Phase or Variant Formation at the Austenite/Twinned Martensite Interface in Modulated Ni–Mn–Ga Martensite

Chulist,

Wójcik,

Sozinov

et al. 2024

Adv Funct Materials

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The crystal structure and transformation path from austenite to 10M martensite in Ni–Mn–Ga single crystal are examined employing high‐energy synchrotron radiation, scanning, and transmission electron microscopy. Using temperature gradient, an austenite/twinned martensite interface is stabilized revealing the crystal structure and microstructure of both phases and the transformation sequence across the interface. Depending on the distance from the interface, three distinct types of martensite crystal lattice, namely simple tetragonal and two monoclinic modulated ones, that is, 10M′ and 10M are confirmed. In situ measurements show that lattice mismatch formed at the habit plane is compensated by the formation of micro‐twinned and branched martensite along with an elastic change in lattice parameters. It is shown that the characteristics for periodic shuffling twin boundaries, such as modulation twins or inverted stacking faults, are installed in later stages of transformation. In other words, large microstructure elements that most efficiently accommodate the strain are installed first, and then smaller elements are operable. Overall, the experimental results show that the crystal lattice does not adapt modulated phase at the habit plane and cannot be built up from simple non‐modulated tetragonal blocks but rather a specific sequence of phase transformations using shear/shuffling deformation takes place.

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Detwinning of a non-modulated Ni–Mn–Ga martensite: From self-accommodated microstructure to single crystal

Cited by 41 publications

References 27 publications

Self-accommodated and pre-strained martensitic microstructure in single-crystalline, metamagnetic Ni–Mn–Sn Heusler alloy

Self-accommodated and pre-strained martensitic microstructure in single-crystalline, metamagnetic Ni–Mn–Sn Heusler alloy

Non-Modulated Martensite Microstructure With Internal Nanotwins In Ni-Mn-Ga Alloys

Adaptive Phase or Variant Formation at the Austenite/Twinned Martensite Interface in Modulated Ni–Mn–Ga Martensite

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