Startseite Role of defectivity on the crystallography of martensitic transformations in Ti50Ni40Cu10: an XRD investigation
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Role of defectivity on the crystallography of martensitic transformations in Ti50Ni40Cu10: an XRD investigation

  • Mauro Coduri EMAIL logo , Carlo A. Biffi , Paola Bassani und Ausonio Tuissi
Veröffentlicht/Copyright: 21. November 2017
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Zeitschrift für Kristallographie - Crystalline Materials
Aus der Zeitschrift Zeitschrift für Kristallographie - Crystalline Materials Band 233 Heft 5

Abstract

Martensitic transformations in Ni50Ti40Cu10 are well known to proceed with a two-step process, from B2 austenite to monoclinic B19′ with intermediate orthorhombic B19. These transformations can be readily followed by X-ray diffraction especially in solution heat-treated materials through split and distribution of the main diffraction lines, while peaks broadening and overlap make the transformations more difficult to be described in highly defective materials. The present study addresses the effect of defects and chemical inhomogeneities on the martensitic transformation, placing particular emphasis on the crystallography of the low temperature B19 to B19′ phase transition. Lattice strains proved to be a powerful tool to monitor the martensitic transformations: whereas a clear discontinuity is observed for the solution heat-treated sample, defects promote a continuous progressive distortion from B19 to B19′. Calorimetry and internal friction investigations were added as a reference to verify the occurrence of the transformations and define the corresponding temperatures.

Keywords: defectivity; martensites; NiTiCu; shape memory alloys; XRD

Acknowledgements

The authors acknowledge Mr. Giordano Carcano for his support in data collections.

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Supplemental Material:

The online version of this article offers supplementary material (https://doi.org/10.1515/zkri-2017-2096).

Received: 2017-8-17
Accepted: 2017-10-22
Published Online: 2017-11-21
Published in Print: 2018-5-24

©2018 Walter de Gruyter GmbH, Berlin/Boston

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  2. Graphical Synopsis
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  8. Role of defectivity on the crystallography of martensitic transformations in Ti50Ni40Cu10: an XRD investigation
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https://doi.org/10.1515/zkri-2017-2096
Schlagwörter für diesen Artikel
defectivity; martensites; NiTiCu; shape memory alloys; XRD

Artikel in diesem Heft

  1. Frontmatter
  2. Graphical Synopsis
  3. Inorganic Crystal Structures
  4. The ternary phases Cu1.5−xLi1+x Sb and Cu4+xLi1−x Sb2, and their structural relations
  5. Synthesis and crystal structures of the new ternary borides Fe3Al2B2 and Ru9Al3B8 and the confirmation of Ru4Al3B2 and Ru9Al5B8−x (x≈2)
  6. Dengue virus 3 NS5 methyltransferase domain: expression, purification, crystallization and first structural data from microcrystalline specimens
  7. The truth is out there: the metal-π interactions in crystal of Cr(CO)3(pcp) as revealed by the study of vibrational smearing of electron density
  8. Role of defectivity on the crystallography of martensitic transformations in Ti50Ni40Cu10: an XRD investigation
  9. Organic and Metalorganic Crystal Structures
  10. Structure–property relation and third-order nonlinear optical studies of two new halogenated chalcones
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