Formation of an intermetallic phase by high energy implantation: The case of nickel in aluminum

Abstract
Phase transformations induced by Ni implantation in Al at energies of 22, 27.7 and 40 MeV has been studied by transmission electron microscopy (TEM) and secondary ion mass spectroscopy. Various Ni doses corresponding with peak concentration of 0.03, 3.5, 6.7 and 12.0 at % were implanted into polycrystalline Al at room temperature, and the specimens were annealed with different heat treatments. Amorphization and Al3Ni precipitates were observed. In this paper the process of amorphization is discussed using both the thermal spike mechanism and the point defects accumulation mechanism. It is concluded that the accumulation of defects is needed for amorphization to occur.

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