Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni1.91Mn1.29Ga0.8

Ari-Gur, Pnina; Garlea, Vasile O.; Cao, Huibo; Ge, Y.; Aaltio, I.; Hannula, S. P.; Koledov, V.

doi:10.1016/j.matpr.2015.07.416

Title: Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni_1.91Mn_1.29Ga_0.8

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Abstract

In this study, Heusler alloys of Ni-Mn-Ga compositions demonstrate ferromagnetic shape memory effect in the martensitic state. The transformation temperature and the chemical order depend strongly on the composition. In the current work, the structure and chemical order of the martensitic phase of Ni_1.91Mn_1.29Ga_0.8 were studied using neutron diffraction; the diffraction pattern was refined using the FullProf software. It was determined that the structural transition occurs around 330 K. At room temperature, 300 K, which is below the martensite transformation temperature, all the Bragg reflections can be described by a monoclinic lattice with a symmetry of space group P 1 2/m 1 and lattice constants of a = 4.23047(7) [Å], b = 5.58333(6) [Å], c = 21.0179(2) [Å], beta = 90.328(1). The chemical order is of critical importance in these alloys, and it was previously studied at 363 K. Analysis of the neutron diffraction in the monoclinic phase shows that the chemical order is maintained during the martensitic transformation.

Authors:

Ari-Gur, Pnina ^[1]; Garlea, Vasile O. ^[2]; Cao, Huibo ^[2]; Ge, Y. ^[3]; Aaltio, I. ^[3]; Hannula, S. P. ^[3]; Koledov, V. ^[4]

Western Michigan Univ., Kalamazoo MI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Aalto Univ. School of Chemical Technology, Espoo (Finland)
Kotelnikov Institute of Radio Engineering and Electronics, Moscow (Russia)

Publication Date:: Thu Nov 05 00:00:00 EST 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1261520

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Materials Today: Proceedings

Additional Journal Information:: Journal Volume: 2; Journal Issue: S3; Journal ID: ISSN 2214-7853

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; chemical order; Ni-Mn-Ga alloy; magnetic shape memory; neutron diffraction; Rietveld method; structure refinement

Citation Formats


                    Ari-Gur, Pnina, Garlea, Vasile O., Cao, Huibo, Ge, Y., Aaltio, I., Hannula, S. P., and Koledov, V. Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni1.91Mn1.29Ga0.8.  United States: N. p., 2015. 
Web.  doi:10.1016/j.matpr.2015.07.416.

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                    Ari-Gur, Pnina, Garlea, Vasile O., Cao, Huibo, Ge, Y., Aaltio, I., Hannula, S. P., & Koledov, V. Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni1.91Mn1.29Ga0.8.  United States.  https://doi.org/10.1016/j.matpr.2015.07.416

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                    Ari-Gur, Pnina, Garlea, Vasile O., Cao, Huibo, Ge, Y., Aaltio, I., Hannula, S. P., and Koledov, V. Thu .  
"Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni1.91Mn1.29Ga0.8".  United States.  https://doi.org/10.1016/j.matpr.2015.07.416.  https://www.osti.gov/servlets/purl/1261520.

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@article{osti_1261520,

  title        = {Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni1.91Mn1.29Ga0.8},

  author       = {Ari-Gur, Pnina and Garlea, Vasile O. and Cao, Huibo and Ge, Y. and Aaltio, I. and Hannula, S. P. and Koledov, V.},

  abstractNote = {In this study, Heusler alloys of Ni-Mn-Ga compositions demonstrate ferromagnetic shape memory effect in the martensitic state. The transformation temperature and the chemical order depend strongly on the composition. In the current work, the structure and chemical order of the martensitic phase of Ni1.91Mn1.29Ga0.8 were studied using neutron diffraction; the diffraction pattern was refined using the FullProf software. It was determined that the structural transition occurs around 330 K. At room temperature, 300 K, which is below the martensite transformation temperature, all the Bragg reflections can be described by a monoclinic lattice with a symmetry of space group P 1 2/m 1 and lattice constants of a = 4.23047(7) [Å], b = 5.58333(6) [Å], c = 21.0179(2) [Å], beta = 90.328(1). The chemical order is of critical importance in these alloys, and it was previously studied at 363 K. Analysis of the neutron diffraction in the monoclinic phase shows that the chemical order is maintained during the martensitic transformation.},

  doi          = {10.1016/j.matpr.2015.07.416},

  journal      = {Materials Today: Proceedings},

  number       = S3,

  volume       = 2,

  place        = {United States},

  year         = {Thu Nov 05 00:00:00 EST 2015},

  month        = {Thu Nov 05 00:00:00 EST 2015}

}

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Title: Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni1.91Mn1.29Ga0.8

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Title: Neutron diffraction study of the martensitic transformation and chemical order in Heusler alloy Ni_1.91Mn_1.29Ga_0.8