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

Table 2

The main parameters of the KH peak in the as-prepared samples.

Sample	, μm	TP, K	δr max, ×10^−3	U0, eV	, 10^−3·K^−1	β
Zr-CG	150	257	0.421	0.34	1.321	2.52
Zr-HEA	12	254	0.666	0.37	1.662	3.82
Zr-HEAD	2	245	17.7	0.36	1.617	3.57
Zr-0	0.392	240	13.3	0.37	1.545	3.43
Zr-01	0.117	232	6.58	0.35	1.521	2.97
Zr-02RT	0.113	231	13.4	0.36	1.523	3.12
Zr-02CE	0.100	226	6.76	0.32	1.534	2.88

is the mean grain size; T_P is the peak temperature; δ is the measured value of the decrement; ; δ_BG is the background decrement; U₀ is the activation energy; is the peak width; β is the parameter of the relaxation time distribution.