Geodesic
Effect of grain size distribution on the strength and strain properties of Zr-Nb alloys under tension at high strain rates
Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 65 (2020), pp. 124-136 Cet article a éte moissonné depuis la source Math-Net.Ru

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Two-level computer simulation is used to study the effect of bimodal grain size distribution on the plastic flow, damage evolution, and fracture of Zr-Nb alloys with a hexagonal close-packed crystal lattice under tension at strain rates of 100 and 1000 s$^{-1}$. The developed computational model allows one to describe the strain and fracture of the Zr-1 % Nb alloy with unimodal and bimodal grain structures under tension at high macroscopic strain rates. It is shown that the damages that cause the fracture of the Zr-1 % Nb alloy arise at the boundaries between coarse grains and volumes with an ultrafine-grained structure at high tensile strain rates. A sharp increase in the strain to fracture and a smooth decrease of the yield strength and tensile strength of the Zr-1 % Nb alloy are observed at increasing volume concentration of large grains from 0 to 30 %. A rational combination of the increased yield strength and tensile strength with satisfactory ductility for strain rates ranging from 100 to 1000 s$^{-1}$ can be achieved in the Zr-1 % Nb alloy when the ratio of the volume of submicron grains to the volume of coarse grains is about 3:7. Numerical simulation results show an insignificant impact of the concentration of dispersed particles of zirconium hydrides with sizes varying from 25 to 40 nm segregated in a grain boundary phase on the tensile strength of the Zr-1 % Nb alloys and on the strain to failure in the studied range of strain rates and temperature.
Keywords: evolution of damages, grain size distribution, zirconium-niobium alloys, high strain rate. 
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     title = {Effect of grain size distribution on the strength and strain properties of {Zr-Nb} alloys under tension at high strain rates},
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N. V. Skripnyak; K. V. Iokhim. Effect of grain size distribution on the strength and strain properties of Zr-Nb alloys under tension at high strain rates. Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 65 (2020), pp. 124-136. http://geodesic.mathdoc.fr/item/VTGU_2020_65_a9/

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