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Martensitic transition and structural modulations in Ni51Fe24Ga25 ferromagnetic shape-memory alloy

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Abstract

The structure of near-stoichiometric Ni51Fe24Ga25 Heusler alloy synthesized by a melt-spinning technique has been studied using transmission electron microscopy. The main phase possessed a local, well-defined L21 high-atomic order structure, and some fcc structural γ phase and lamellar twin structures were also present. At room temperature, a rich variety of micro-modulated domains in the parent phase was observed. The domain structures were aligned along the 〈110〉, 〈100〉, 〈211〉, and ~14° off 〈110〉 directions, resulting in a complex tweed contrast. These are possibly the precursors of martensitic transformation (MT). Below the MT temperature, Ms, the cubic parent phase transformed into modulated martensitic variants, which were composed of lamellar structures with predominantly 10 and 14 M modulated structures along the 〈110〉 directions.

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Acknowledgement

This work is supported by the National Science Foundation of China with Grant No. 50801007 and 50971130.

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Correspondence to Z. W. Du.

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Du, Z.W., Shao, B.L., Liu, A.S. et al. Martensitic transition and structural modulations in Ni51Fe24Ga25 ferromagnetic shape-memory alloy. J Mater Sci 46, 2733–2740 (2011). https://doi.org/10.1007/s10853-010-5146-4

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