Analysis of electrical conduction mechanism in the high temperature range of the nanostructured photoabsorber Cu 2 SnS 3

2016 ◽  
Vol 500 ◽  
pp. 161-164 ◽  
Author(s):  
S. Lahlali ◽  
L. Essaleh ◽  
M. Belaqziz ◽  
H. Chehouani ◽  
K. Djessas ◽  
...  
Keyword(s):  
High Temperature ◽  
Electrical Conduction ◽  
Conduction Mechanism ◽  
High Temperature Range ◽  
Electrical Conduction Mechanism ◽  
Temperature Range

scholarly journals High-Temperature Deformation of Naturally Aged 7010 Aluminum Alloy

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 581
Author(s):  
Abdulhakim A. Almajid
Keyword(s):  
Activation Energy ◽  
Aluminum Alloy ◽  
High Temperature ◽  
Threshold Stress ◽  
Activation Energies ◽  
Temperature Deformation ◽  
High Temperature Range ◽  
Temperature Range ◽  
True Activation Energy ◽  
Two Temperatures

This study is focused on the deformation mechanism and behavior of naturally aged 7010 aluminum alloy at elevated temperatures. The specimens were naturally aged for 60 days to reach a saturated hardness state. High-temperature tensile tests for the naturally aged sample were conducted at different temperatures of 573, 623, 673, and 723 K at various strain rates ranging from 5 × 10−5 to 10−2 s−1. The dependency of stress on the strain rate showed a stress exponent, n, of ~6.5 for the low two temperatures and ~4.5 for the high two temperatures. The apparent activation energies of 290 and 165 kJ/mol are observed at the low, and high-temperature range, respectively. These values of activation energies are greater than those of solute/solvent self-diffusion. The stress exponents, n, and activation energy observed are rather high and this indicates the presence of threshold stress. This behavior occurred as a result of the dislocation interaction with the second phase particles that are existed in the alloy at the testing temperatures. The threshold stress decreases in an exponential manner as temperature increases. The true activation energy was computed by incorporating the threshold stress in the power-law relation between the stress and the strain. The magnitude of the true activation energy, Qt dropped to 234 and 102 kJ/mol at the low and high-temperature range, respectively. These values are close to that of diffusion of Zinc in Aluminum and diffusion of Magnesium in Aluminum, respectively. The Zener–Hollomon parameter for the alloy was developed as a function of effective stress. The data in each region (low and high-temperature region) coalescence in a segment line in each region.

Electrical Conduction Mechanism in Bi4Ti3O12Single Crystal

2002 ◽  
Vol 41 (Part 1, No. 11B) ◽  
pp. 7053-7056 ◽  
Author(s):  
Masatake Takahashi ◽  
Yuji Noguchi ◽  
Masaru Miyayama
Keyword(s):  
Electrical Conduction ◽  
Conduction Mechanism ◽  
Electrical Conduction Mechanism
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