The Effect of the Annealing Parameters on the Structure and Characteristic Temperatures of the Nonstoichiometric Ni2MnGa Alloys

Marek Gigla; Paweł Szczeszek

doi:10.4028/www.scientific.net/SSP.130.135

Paper Titles

Refinement of the Cu Structure by Oscillatory Compression Test
p.111

Influence of the Ga Alloying on the Properties of NiAl Based Alloys
p.117

Preparation by Twin Roll Casting and Characterization of TiNi Shape Memory Alloys Strips
p.121

Effect of L2₁ Ordering on the Martensitic and Intermartensitic Transformations in a Ni-Mn-Ga Shape Memory Alloy
p.127

The Effect of the Annealing Parameters on the Structure and Characteristic Temperatures of the Nonstoichiometric Ni₂MnGa Alloys
p.135

Martensitic Transformation, Structure and Magnetic Properties of Co-Ni-Ga Ferromagnetic Shape Memory Alloys
p.141

Phase Transformation in Ti-Ni-Ta Shape Memory Alloy
p.147

Characterization of Nitrided/Oxidized Layers Covering Ni-Ti Shape Memory Alloy
p.151

Characterisation of β Phase in WE54 Magnesium Alloy
p.155

HomeSolid State PhenomenaSolid State Phenomena Vol. 130The Effect of the Annealing Parameters on the...

The Effect of the Annealing Parameters on the Structure and Characteristic Temperatures of the Nonstoichiometric Ni₂MnGa Alloys

Abstract:

Transmission electron microscopy studies of the Ni2MnGa alloy showed that in the diffraction patterns there exist two additional effect apart from the spots given by the parent L21 Heusler phase and the tetragonal no modulate martensite. The first effect was the presence of sharp extra spots, lying on a direction significantly deviated from the <110>* for [001]β zone axis. These spots are connected with modulation of the parent phase. The value of the deviation angle is about 11-12°. The detailed analysis showed that the direction of the propagation vector of modulation is <641> type direction. The second effect visible in the [001]β diffraction patterns is the presence of the arcs located between the 220 type parent phase spots.. The analysis of this objects suggests that some chemical modulation exists with the period of <550>β. In this case short range ordering plays the essential role.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Solid State Phenomena (Volume 130)

Pages:

135-140

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.130.135

Citation:

Cite this paper

Online since:

December 2007

Authors:

Marek Gigla, Paweł Szczeszek

Keywords:

Magnetic Shape Memory Effect (MSME), Modulated Structures, Ni₂MnGa Alloy

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] U. Stuhr, P. Vorderwisch, V. V. Kokorin, Physica B 234-236 (1997)135-136.

Google Scholar

[2] V. Chernenko, V. L'vov, E. Cesari, J. Pons, R. Portier, S. Zagorodnyuk, Materials Trans. 43 (2002) 856-860.

DOI: 10.2320/matertrans.43.856

Google Scholar

[3] V.V. Kokorin, V.A. Chernenko, J. Pons, C. Segui, E. Cesari, Solid State Communications, 101 (1997) 7-9.

Google Scholar

[4] V.A. Chernenko, J. Pons, C. Segui, E. Cesari, Acta Materialia, 50 (2002) 53-60.

Google Scholar

[5] J.C. Bennet, C.V. Hyatt, M.A. Gharghour, S. Farrell, Mater. Sci Eng. A378 (2004) 409.

Google Scholar

[6] S. Farrell, C. Hyatt, B. Armstrong, I. Krenough, Proc. Of Inter. Conf. On Shape Memory and Superelastic Technol., California (2003) 101.

Google Scholar

[7] M. Gigla, P. Szczeszek, H. Morawiec, Mater. Science & Engin. (in press) Acknowledgment Funding for this work has been provided by KBN grant No. PBZ-100/TO8/10/2003 (a) (b).

Google Scholar