Features of formation of nanocrystalline state in internal- oxidized V-Cr-Zr-W and V-Mo-Zr system alloys during deformation by torsion under pressure

International Conference on Advanced Materials and New Technologies in Modern Materials Science 2015

Smirnov, I.V.^1,2 ; Ditenberg, I.A.^1,2,3 ; Grinayev, K.V.^1,2,3 ; Radishevsky, V.L.^1

National Research Tomsk State University, Tomsk

634050, Russia^1

Siberian Physical-Technical Institute, Tomsk

634050, Russia^2

Institute of Strength Physics and Materials Science SB RAS, Tomsk

634055, Russia^3

关键词: Deformation degrees;    High angle boundaries;    High anisotropy;    Misorientations;    Nanocrystalline state;    Nanostructural;    Structural state;    Two-level structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/116/1/012037/pdf
DOI  :  10.1088/1757-899X/116/1/012037

来源: IOP

【 摘 要 】

The results of investigation of features of nanostructural state formed during deformation by torsion under pressure in high-strength vanadium V-Cr-Zr-W and V-Mo-Zr systems alloys are presented. It was found that after deformation at number of revolutions N = 1, samples are characterized by high anisotropy of defect and grain structure. Inside grains, limited by high-angle boundaries, the formation of two-level structure states was revealed: fragmentation of the above grains on nanofragments from 5 to 20 nm in size with a dipole nature of low-angle misorientations and high (hundreds of degrees per micron) elastic curvature of crystal lattice. Formation of the above structural states leads to a 3-fold increase in microhardness values. Further increase in deformation degree leads to fracture of samples of vanadium alloy V-Mo-Zr with a high volumetric content of fine-disperse oxide phase. At the same time V-Cr-Zr-W-system alloy with a lower concentration of Zr and, as a result, a lower volume fraction of fine particles remains ductile.