title: Misfit stabilized embedded nanoparticles in metallic alloys.
abstract: Nanoscale inhomogeneities are typical for numerous metallic alloys and crucially important for their practical applications. At the same time, stabilization mechanisms of such a state are poorly understood. We present a general overview of the problem, together with a more detailed discussion of the prototype example, namely, Guinier-Preston zones in Al-based alloys. It is shown that coherent strain due to a misfit between inclusion and host crystal lattices plays a decisive role in the emergence of the inhomogeneous state. We suggest a model explaining the formation of ultrathin plates (with the thickness of a few lattice constants) typical for Al-Cu alloys. Discreteness of the array of misfit dislocations and long-ranged elastic interactions between them are the key ingredients of the model. This opens a way for a general understanding of the nature of (meta)stable embedded nanoparticles in practically important systems.
authors.affiliation: Institute of Quantum Materials Science, CJSC, Ekaterinburg 620075, Russia.
authors.forename: Yu N
authors.initials: YN
authors.lastname: Gornostyrev
authors.forename: M I
authors.initials: MI
authors.lastname: Katsnelson