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Applied Physics Letters / Volume 97 / Issue 17 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 97, 171905 (2010); http://dx.doi.org/10.1063/1.3506508 (3 pages)

Strain-induced dimensionality crossover and associated pseudoelasticity in the premartensitic phase of Ni2MnGa

Z. H. Nie1,2, Y. Ren3, Y. D. Wang1, D. M. Liu2, D. E. Brown4, G. Wang2, and L. Zuo2

1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
2Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, People's Republic of China
3X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
4Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA

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(Received 17 September 2010; accepted 4 October 2010; published online 26 October 2010)

The in situ high-energy x-ray diffraction was used for revealing an atomic mechanism on the two-step pseudoelastic behavior found in the premartensitic phase of Ni2MnGa magnetic shape memory alloy. The applied stress first suppresses the three-dimensional modulated structure of the premartensitic phase to a two-dimensional modulated one, which is accompanied by a change in the modulation wave vector and accommodates a large lattice strain reaching ∼ 1%. With further increasing stress, the two-dimensional modulated premartensite transforms to the five-layered modulated martensite. The observation of the stress-induced dimensionality crossover of atomic modulation has broad impacts in understanding not only the mechanical properties of advanced shape memory alloys but also the physical properties of condensed matter with heterogeneous structures.

© 2010 American Institute of Physics

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KEYWORDS and PACS

Keywords

elasticity, gallium alloys, magnetic materials, manganese alloys, martensitic transformations, nickel alloys, shape memory effects, X-ray diffraction

PACS

  • 81.40.Jj

    Elasticity and anelasticity, stress-strain relations

  • 62.20.fg

    Shape-memory effect; yield stress; superelasticity

  • 62.20.dq

    Other elastic constants

  • 81.30.Kf

    Martensitic transformations

  • 64.70.K-

    Solid-solid transitions

  • 81.40.Lm

    Deformation, plasticity, and creep

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3506508

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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