Effect of chemical ordering annealing on superelasticity of Ni–Mn–Ga–Fe ferromagnetic shape memory alloy microwires

Liu Yanfen^{1, †}, Zhang Xuexi², Shen Hongxian², Sun Jianfei², Li Qinan¹, Liu Xiaohua¹, Li Jianjun¹, Cheng Weidong¹

TEM micrographs of martensite twin structure for (a) as-extracted and (b) annealed Ni₅₀Mn₂₅Ga₂₀Fe₅ microwires. Insets in (a) and (b) are the corresponding diffraction patterns of the martensite phase showing 7M modulated structure, respectively.