New sequences of phase transition in Ni-Mn-Ga ferromagnetic shape memory nanoparticles

D. M. Liu, Z. H. Nie, Y. D. Wang, Y. D. Liu, G. Wang, Y. Ren, L. Zuo

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

26 Citations (Scopus)

Abstract

In-situ high-energy X-ray diffraction was used for tracing the structural transitions in Ni<sub>2</sub>MnGa and Ni<sub>47</sub> Mn<sub>25</sub>Ga<sub>22</sub>Co<sub>6</sub> nanoparticles that were prepared by a ball-milling and subsequent annealing process. A decrease in martensitic transformation temperature was evidenced in all annealed nanoparticles. It was found that a three-layered modulated structure, usually observed as a metastable premartensitic phase in coarse-grained alloys, becomes a stable phase in the annealed Ni<sub>2</sub>MnGa nanoparticles up to 4 K. © The Minerals, Metals & Materials Society and ASM International 2007.
Original languageEnglish
Pages (from-to)466-469
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume39
Issue number2
DOIs
Publication statusPublished - Feb 2008
Externally publishedYes

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