Quasicrystallinity in theTi2Ni(Si) system

We report the first fabrication of quasicrystals (QC’s) coexisting with equilibrium-phase ${\mathrm{Ti}}_2$Ni, in rapidly quenched ${\mathrm{Ti}}_{56}$ ${\mathrm{Ni}}_{28}$ ${\mathrm{Si}}_{16}$. The QC phase is paramagnetic with ${\chi }_0$=2.7×${10}^{\mathrm{-}6}$ emu/g Oe (as compared to icosahedral ${\mathrm{Al}}_{80}$ ${\mathrm{Mn}}_{20}$, for which ${\chi }_0$=1.43×${10}^{\mathrm{-}6}$ emu/g Oe) and shows a small effective moment of 0.05${\mu }_B$ per Ni atom. The susceptibility of the icosahedral phase is greater than that of the equilibrium phase where Ni atoms occupy sites of nearly icosahedral symmetry. Heat treating at or above 1000 °C for several hours crystallizes the QC phase.