摘要
Martensitic transformations, martensitic structures and substructures of Ni50Mn29Ga21Tb1.2 shape memory alloy were studied by DTA, X-ray diffraction and electron diffraction. The results show that the mainly phase at room temperature has body-centred tetragonal structure with the lattice parameters ： a = b = 0.60 ran, c = 0.5546 nm; and has body-centred monoclinic with lattice parameters： a =0.616 nm, b =0.581 nm, c = 0.553 nm, β = 90.8° in some tiny area. The substructures of Ni50Mn29Ga21Tb1.2 at room temperature are twin.
Martensitic transformations, martensitic structures and substructures of Ni50Mn29Ga21Tb1.2 shape memory alloy were studied by DTA, X-ray diffraction and electron diffraction. The results show that the mainly phase at room temperature has body-centred tetragonal structure with the lattice parameters ： a = b = 0.60 ran, c = 0.5546 nm; and has body-centred monoclinic with lattice parameters： a =0.616 nm, b =0.581 nm, c = 0.553 nm, β = 90.8° in some tiny area. The substructures of Ni50Mn29Ga21Tb1.2 at room temperature are twin.
