Abstract
The crystal structure and the morphology of the metastable X phase which appears in shape memory Ti-Ni alloys have been investigated by transmission electron microscopy and X-ray diffraction. The crystal structure has been determined to be rhombohedral and to belong to the space group R 3 ̄ , where the rhombohedral unit cell contains six titanium atoms and eight nickel atoms. The atom positions and the lattice parameters have been determined. The orientation relationship between the X phase and the matrix, and the habit plane have also been determined.
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