Features of change of V-4Ti-4Cr alloy hardness during microstructure evolution under severe plastic deformation

doi:10.1063/1.4932733

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DOI Доступ к ресурсу на сайте издателя			10.1063/1.4932733

#пластическая деформация

#микроструктура

Title: Features of change of V-4Ti-4Cr alloy hardness during microstructure evolution under severe plastic deformation
Creator: Ditenberg, Ivan A.
|
Tyumentsev, Alexander N.
Contributor: Томский государственный университет Физический факультет Кафедра физики металлов
-: Томский государственный университет Сибирский физико-технический институт Научные подразделения СФТИ
Date: 2015
DOI: 10.1063/1.4932733
Description: Features of changes of microhardness and nanohardness of V–4Ti–4Cr alloy at different stages of microstructure transformation during severe plastic deformations by torsion under pressure are presented. Microstructure features and mechanisms of its transformation affecting the hardness of studied alloy are discussed. Local temperature increase and activization of relaxation processes of nonequilibrium nanostructure states with high (hundreds of degrees/µm) elastic curvature of the crystal lattice are considered as main factors that define nonmonotonic character of changes in the microhardness at the stage of formation and evolution of the two-level structural states. In alloy under study at a value of true logarithmic deformation e ≥ 6.6 the formation of areas consisting of nanocrystals several nanometers in size with a high density of large-angle boundaries and elastic curvature of the crystal lattice hundreds of degrees/µm was found. Hardness of the material (Hnano ≈ E/16) differs little from its theoretical (limit) hardness.