GRAIN GROWTH DURING ANNEALING OF ULTRAFINE-GRAINED AND NANOMATERIALS
Volokitina I.E. Fedorova T.D. Lavrinyuk D.N.
April–June 2025G.V. Kurdyumov Institute for Metal Physics of N.A.S. of Ukraine
Progress in Physics of Metals
2025#26Issue 2299 - 326 pp.
Ultrafine-grained metals and alloys with a submicrocrystalline structure in some cases demonstrate a set of unique properties, for example, high strength and hardness, low-temperature superplasticity at high strain rates, and improved electrical and magnetic properties. Severe plastic deformation (SPD) is one of the main methods for producing ultrafine-grained materials, and various methods of SPD have been developed in recent decades. The uniqueness of these methods is the ability to deform the material to large degrees of deformation without significantly changing the external dimensions of the product; that is, strain by methods of SPD is mainly aimed at changing the internal structure of materials, namely, the dimensions of structural elements. Along with the ultrafine structure, the most important feature of ultrafine-grained materials obtained by SPD is the presence of deformation-modified (‘nonequilibrium’) crystallite boundaries. In recent years, considerable attention has been paid to the study of nonequilibrium grain boundaries. However, as a rule, such studies were car-ried out using one research method (electron microscopy, determination of diffusion parameters, tunnelling or atomic force microscopy, etc.), which did not allow a comprehensive characterisation of the state of grain boundaries. Therefore, there is a need for a comprehensive study of the state of grain boundaries in ultrafine-grained materials subjected to SPD.
deformation modification , grain boundaries , grain growth , nanomaterials , ultra-fine-grained metals
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