Table 2.

The fitted parameters of the equivalent circuit model by the Nyquist plots.

Parameters	As-Cast	Pre-Extrusion Heat Treated	As-Extruded	Post-Extrusion Heat Treated
Rs (Ω·cm2)	8.68	16.52	8.857	13.36
Rc (Ω·cm2)	4.74	4.27	5.50	0.098
Cc (F·cm2)	3.38 × 10−7	2.32 × 10−7	2.90 × 10−7	1.85 × 10−13
CPE-T (μΩ−1·cm−2·s−1)	2.55 × 10−5	2.32 × 10−5	3.00 × 10−5	2.18 × 10−5
CPE-P	0.91279	0.90695	0.91894	0.91298
Rct (Ω·cm2)	339.8	350.8	343	548.2
RL (Ω·cm2)	1110	640.6	-	1716
L (H·cm2)	9989	9261	-	22,845
Rf (Ω·cm2)	63.3	153.2	50.3	133.7
Cf (F·cm2)	0.0074	0.0038	0.0073	0.0034
chisq	0.0020	0.0014	0.0033	0.0011