Abstract

The transformation of quasicrystal in (Ti1−xVx)2Ni alloys, x=0.0–0.3, to the equilibrium Ti2Ni and TiNi phases on heating in-situ in an electron microscope has been studied. Twins occurred frequently in the fcc Ti2Ni across {111} planes and fivefold twins sometimes can be obtained. The electron diffraction patterns of fivefold twins and quasicrystal are similar but distinctly different. A parallel orientation relationship existed between the fcc Ti2Ni and the ordered bcc TiNi.

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