A kinetic study approach for in-situ preparation of amorphous Ni based nanocomposite reinforced by nanocrystalline Ni-Ti shape memory alloy

In-situ preparation of nanocomposite including a shape memory alloy (Ni-Ti) as reinforcement in the Ni amorphous matrix is the subject of this content. Firstly, the amorphous alloy has been prepared using high-energy ball milling of pure elements, i.e., Ni, Nb, Ti and Si as alloying elements. Then, by the employment of kinetic modeling, the crystallization process (i.e., as a two-step phenomenon) of prepared amorphous alloy has been controlled in a way that provides the possibility of the formation of Ni-Ti as the reinforcement within the Ni amorphous alloy matrix. Also, the kinetic modeling revealed that the crystallization can be explained using the Johnson-Mehl-Avrami (JMA) model. Also, the crystallization phenomenon started by interface controlled with one-dimensional growth of nuclei at first and followed by interface controlled with two and three-dimensional growth of nuclei.