Crystal structure and macrotwin interface of five-layered martensite in Ni-Mn-Ga magnetic shape memory alloy

Y. Ge (Corresponding Author), Hua Jiang, A. Sozinov, O. Söderberg, N. Lanska, J. Keränen, Esko I. Kauppinen, V.K. Lindroos, Simo-Pekka Hannula

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The crystal structure of the five-layered (5M) martensite and the martensite to martensite interface in the alloys Ni48.9Mn30.8Ga20.3 and Ni49.5Mn28.6Ga21.9 (numbers indicate at.%) were investigated by the X-ray diffraction as well as by the conventional and by the high resolution transmission electron microscopy (HRTEM). The martensite to martensite interface arises from meeting of growth fronts of two microtwin sequences with the twin planes (1 1 0) and (1 1 0), respectively. The interface was found to consist of two different configurations, the crossing and the step type. The HRTEM images reveal that the martensitic structure is not a perfect five-layered structure, but there are also other periodic structures (seven-layered and ten-layered), together with aperiodic structure and the irregular plane faults.
Original languageEnglish
Pages (from-to)961-964
Number of pages4
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume438-440
Issue number3
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

shape memory alloys
martensite
Shape memory effect
Martensite
Crystal structure
crystal structure
High resolution transmission electron microscopy
transmission electron microscopy
high resolution
Periodic structures
X ray diffraction
configurations
diffraction
x rays

Keywords

  • Ni-Mn-Ga alloys
  • twinning
  • gallium
  • manganese
  • nickel
  • martensite
  • Ni-based alloys
  • nickel-based alloys
  • microtwin
  • HRTEM
  • X-ray diffraction

Cite this

Ge, Y. ; Jiang, Hua ; Sozinov, A. ; Söderberg, O. ; Lanska, N. ; Keränen, J. ; Kauppinen, Esko I. ; Lindroos, V.K. ; Hannula, Simo-Pekka. / Crystal structure and macrotwin interface of five-layered martensite in Ni-Mn-Ga magnetic shape memory alloy. In: Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing. 2006 ; Vol. 438-440, No. 3. pp. 961-964.
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abstract = "The crystal structure of the five-layered (5M) martensite and the martensite to martensite interface in the alloys Ni48.9Mn30.8Ga20.3 and Ni49.5Mn28.6Ga21.9 (numbers indicate at.{\%}) were investigated by the X-ray diffraction as well as by the conventional and by the high resolution transmission electron microscopy (HRTEM). The martensite to martensite interface arises from meeting of growth fronts of two microtwin sequences with the twin planes (1 1 0) and (1 1 0), respectively. The interface was found to consist of two different configurations, the crossing and the step type. The HRTEM images reveal that the martensitic structure is not a perfect five-layered structure, but there are also other periodic structures (seven-layered and ten-layered), together with aperiodic structure and the irregular plane faults.",
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Crystal structure and macrotwin interface of five-layered martensite in Ni-Mn-Ga magnetic shape memory alloy. / Ge, Y. (Corresponding Author); Jiang, Hua; Sozinov, A.; Söderberg, O.; Lanska, N.; Keränen, J.; Kauppinen, Esko I.; Lindroos, V.K.; Hannula, Simo-Pekka.

In: Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Vol. 438-440, No. 3, 2006, p. 961-964.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Crystal structure and macrotwin interface of five-layered martensite in Ni-Mn-Ga magnetic shape memory alloy

AU - Ge, Y.

AU - Jiang, Hua

AU - Sozinov, A.

AU - Söderberg, O.

AU - Lanska, N.

AU - Keränen, J.

AU - Kauppinen, Esko I.

AU - Lindroos, V.K.

AU - Hannula, Simo-Pekka

PY - 2006

Y1 - 2006

N2 - The crystal structure of the five-layered (5M) martensite and the martensite to martensite interface in the alloys Ni48.9Mn30.8Ga20.3 and Ni49.5Mn28.6Ga21.9 (numbers indicate at.%) were investigated by the X-ray diffraction as well as by the conventional and by the high resolution transmission electron microscopy (HRTEM). The martensite to martensite interface arises from meeting of growth fronts of two microtwin sequences with the twin planes (1 1 0) and (1 1 0), respectively. The interface was found to consist of two different configurations, the crossing and the step type. The HRTEM images reveal that the martensitic structure is not a perfect five-layered structure, but there are also other periodic structures (seven-layered and ten-layered), together with aperiodic structure and the irregular plane faults.

AB - The crystal structure of the five-layered (5M) martensite and the martensite to martensite interface in the alloys Ni48.9Mn30.8Ga20.3 and Ni49.5Mn28.6Ga21.9 (numbers indicate at.%) were investigated by the X-ray diffraction as well as by the conventional and by the high resolution transmission electron microscopy (HRTEM). The martensite to martensite interface arises from meeting of growth fronts of two microtwin sequences with the twin planes (1 1 0) and (1 1 0), respectively. The interface was found to consist of two different configurations, the crossing and the step type. The HRTEM images reveal that the martensitic structure is not a perfect five-layered structure, but there are also other periodic structures (seven-layered and ten-layered), together with aperiodic structure and the irregular plane faults.

KW - Ni-Mn-Ga alloys

KW - twinning

KW - gallium

KW - manganese

KW - nickel

KW - martensite

KW - Ni-based alloys

KW - nickel-based alloys

KW - microtwin

KW - HRTEM

KW - X-ray diffraction

U2 - 10.1016/j.msea.2005.12.057

DO - 10.1016/j.msea.2005.12.057

M3 - Article

VL - 438-440

SP - 961

EP - 964

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

IS - 3

ER -