Localized solid-state amorphization (LSSA) transformation of nanocrystalline materials induced by mechanical deformation is proposed to obtain localized amorphous structure in recent years. This new method forms an entirely new plastic deformation mechanism in nanocrystalline materials with dislocation, deformation twinning, grain boundary slide and grain rotation as the main deformation mechanism. The critical transformation condition and the transition mechanism of the LSSA transformation provide a basis for the optimum structural design of materials. This paper summarizes the domestic and foreign experimental and simulative studies of deformation-induced LSSA transformation, such as mechanical ball milling, high-voltage torsional deformation, classical force field and molecular dynamics methods, which prove existence of the deformation-induced LSSA transformation. Also, the intrinsic mechanism of LSSA transformation is analyzed. Based on the advantages of the crystal phase field model, this method is proposed to simulate the LSSA transformation and the crystal phase field method can effectively study the LSSA transformation process.
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2018, Vol. 32 
