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Structure formation in annealed NiMnGa shape memory alloys

Rafał Wróblewski ,  Marcin Leonowicz 

Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland


Effect of annealing conditions on the structure and phase transition temperatures for polycrystalline Ni50Mn29Ga21 alloy was studied. The final structure strongly depends on the annealing temperature and cooling rate. Ordering of the austenitic phase, performed by annealing at elevated temperatures, plays an important role in formation of the proper martensitic structure. For the Ni50Mn29Ga21 alloy annealing below the ordering temperature (1033 K) forms 5M modulated martensitic structure, irrespective of the cooling rate. The 7M modulated martensitic structure can be produced after annealing above the ordering temperature, followed by slow cooling.


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Presentation: Oral at E-MRS Fall Meeting 2008, Symposium C, by Rafał Wróblewski
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-06-11 14:27
Revised:   2009-06-07 00:48