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Nanocrystalline  metals crystallized  from  amorphous solids: nanocrystallization,  structure, and propertie

Abstract
Polycrystalline materials with nanometer-sized  grains, termed  nanocrystalline  materials, can be formed  by crystallizing completely amorphous  solids under proper heat treatment  conditions.  The crystallized nanocrystalline materials exhibit some unique structural characteristics  and novel properties  which are fundamentally different from those  of the conventional  coarse-grained  polycrystalline materials. This article reviews  the  present state of the art in this field. The current status of research  and developments  on the nanocrystallization,
microstructure and properties of the materials will be summarized.  Comparisons  of structural characteristics and properties  are made between  the crystallized nanocrystalline  materials and those  prepared  by other methods. Further considerations  of the development  and applications  of this new class  of materials will also be presented
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