New sequences of phase transition in ni-mn-ga ferromagnetic shape memory nanoparticles

作者：Liu D M^*; Nie Z H; Wang Y D; Liu Y D; Wang G; Ren Y; Zuo L

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2008, 39A(2): 466-469.

DOI：10.1007/s11661-007-9435-8

In-situ high-energy X-ray diffraction was used for tracing the structural transitions in Ni(2)MnGa and Ni(47)Mn(25)Ga(22)Co(6) 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(2)MnGa nanoparticles up to 4 K.

• 出版日期2008-2
• 单位东北大学