Highly mobile twinned interface in 10M modulated Ni–Mn–Ga martensite: Analysis beyond the tetragonal approximation of lattice

Straka, Ladislav; Heczko, Oleg; Seiner, Hanuš; Lanska, Natalyia; Drahokoupil, Jan; Soroka, A. A.; Fähler, S.; Hänninen, Hannu; Sozinov, A.

doi:10.1016/j.actamat.2011.09.020

Cited by 199 publications

(138 citation statements)

References 43 publications

Supporting

Mentioning

121

Contrasting

Unclassified

Order By: Relevance

“…they are tilted 4° from (101) plane. [28,29]. The Type I exhibits strong decreasing dependency of the twinning stress with increasing temperature, whereas the twinning stress of Type II is nearly temperature independent and sufficiently low in a relatively wide temperature range [30,31].…”

Section: Introductionmentioning

confidence: 95%

Ab initiostudy of Ni₂MnGa under shear deformation

Zelený

Straka

Sozinov

2015

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. The effect of shear deformation on Ni2MnGa magnetic shape memory alloy has been investigated using ab initio electronic structure calculations. We used the projector-augmented wave method for the calculations of total energies and stresses as functions of applied affine shear deformation. The studied nonmodulated martensite (NM) phase exhibits a tetragonally distorted L21 structure with c/a > 1. A large strain corresponding to simple shears in <100>{001}, <001>{100} and <010>{100} systems was applied to describe a full path between two equivalent NM lattices. We also studied <10-1>{101} shear which is related to twining of NM phase. Twin reorientation in this system is possible, because applied positive shear results in path with significantly smaller energetic barrier than for negative shear and for shears in other studied systems. When the full relaxation of lattice parameters is allowed, the barriers further strongly decrease and the structures along the twinning path can be considered as orthorhombic.

show abstract

Section: Introductionmentioning

confidence: 95%

Ab initiostudy of Ni₂MnGa under shear deformation

Zelený

Straka

Sozinov

2015

MATEC Web of Conferences

View full text Add to dashboard Cite

show abstract

“…First indications of these boundaries have recently been reported also for 10M martensite in Ni-Mn-Ga. 28 For the present films we have no indication of these types of boundaries, hence they will not be considered in the following.…”

Section: Magnetic Properties Of Ni-mn-gamentioning

confidence: 99%

Magnetic domain pattern in hierarchically twinned epitaxial Ni–Mn–Ga films

Diestel

Neu

Backen

et al. 2013

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Magnetic shape memory alloys exhibit a hierarchically twinned microstructure, which has been well examined in epitaxial Ni-Mn-Ga films. Here we analyze consequences of this "twin within twins" microstructure on the magnetic domain pattern. Atomic and magnetic force microscopy are used to probe the correlation between the martensitic microstructure and magnetic domains. We examine consequences of different twin boundary orientations with respect to the substrate normal as well as variant boundaries between differently aligned twinned laminates. A detailed micromagnetic analysis is given which describes the influence of the finite film thickness on the formation of magnetic band domains in these multiferroic materials.

show abstract

“…The complexity of different kinds of twin boundaries (i.e. type I and type II) coupled with the a/b and modulation boundaries recently reported in [5] seem to account for different levels of critical twinning stress observed during martensite reorientation in modulated structures. On the other hand, the non-modulated (NM) structure due to the relatively high critical twinning stress and insufficient magnetic crystalline anisotropy * INSTITUTE OF METALLURGY AND MATERIALS SCIENCE, POLISH ACADEMY OF SCIENCES, 25 REYMONTA STR., 30-059 KRAKÓW, POLAND # Corresponding author: m.szczerba@imim.pl was considered incapable of possessing the MFIS effect [8].…”

Section: Introductionmentioning

confidence: 99%

“…The microstructure of modulated martensites has been thoroughly studied by x-ray and electron backscatter diffraction (EBSD) techniques revealing a more complex character of twin boundaries than earlier assumed [4][5][6][7]. The complexity of different kinds of twin boundaries (i.e.…”

Section: Introductionmentioning

confidence: 99%

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

Szczerba¹

2015

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

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.

show abstract

Highly mobile twinned interface in 10M modulated Ni–Mn–Ga martensite: Analysis beyond the tetragonal approximation of lattice

Cited by 199 publications

References 43 publications

Ab initiostudy of Ni₂MnGa under shear deformation

Ab initiostudy of Ni₂MnGa under shear deformation

Magnetic domain pattern in hierarchically twinned epitaxial Ni–Mn–Ga films

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

Contact Info

Product

Resources

About

Highly mobile twinned interface in 10M modulated Ni–Mn–Ga martensite: Analysis beyond the tetragonal approximation of lattice

Cited by 199 publications

References 43 publications

Ab initiostudy of Ni2MnGa under shear deformation

Ab initiostudy of Ni2MnGa under shear deformation

Magnetic domain pattern in hierarchically twinned epitaxial Ni–Mn–Ga films

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

Contact Info

Product

Resources

About

Ab initiostudy of Ni₂MnGa under shear deformation

Ab initiostudy of Ni₂MnGa under shear deformation