Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and Annealing

Figure 1

Temperature dependences of the logarithmic decrement in zirconium samples with the different mean grain size : 1-Zr-CG,  = 150 μm; 2-Zr-HEA,  = 12 μm; 3-Zr-HEAD,  = 2 μm; 4-Zr-0,  = 392 nm; 5-Zr-01,  = 117 nm; 6-Zr-02RT,  = 113 nm; 7-Zr-02CE,  = 100 nm.