Temperature dependence of electrical resistivity and microstructure of Pb-Cd alloys

Sakr, M. S.; Mohamed, Amal; El-Daly, A.A.; El-Saadani, E. A.; El-Zomor, Mohamed A.

doi:10.1007/bf01197654

Cited by 3 publications

(1 citation statement)

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“…(4): The relation between ln β , ln * st ε for annealed (Pb-1.5 wt%Sb) alloy The activation energy of creep [22] was calculated from the straight lines relating β ln and 10 3 /TK -1 as shown in Fig (5). In the temperature range above 443K, the activation energy was found to be 42 KJ/mole, which characterize the mechanism of grain boundary sliding [23]. Below 443K, the activation energy was found to be 52 KJ/mole which characterizes a dislocation intersection mechanism.…”

Section: Resultsmentioning

confidence: 92%

Effect of Microstructural Variations Developed by heat Treatment On the Mechanical and Electrical Properties of (Pb-1.5 wt % Sb)

2006

Egyptian Journal of Solids

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The purpose of the present work is to investigate the effect of microstructural variations of the annealed (Pb-1.5 wt % Sb) alloy during the phase transformation, on their mechanical and electrical properties. Creep tests on the studied alloy (slow cooled) were made under different constant stresses ranging from 12 M Pa to 15 M Pa near the transformation temperature. Transient and steady state creep of this alloy showed a transition point at 443K. The transient creep parameters (β and n) were found to change with the applied stress and ageing temperature. The value of the time exponent(γ) was found to be 0.45, the activation energy of both the transient and steady state creep was found to be 42 kJ/mole and 52kJ/mole respectively above 443K. It was found that the strain rate sensitivity parameter (m) has the values ranging from 0.17 to 0.35. The microstructure of the deformed alloy samples were investigated by : X-ray diffraction technique which showed that the residual internal lattice strain was at 443K. Transmission electron microscopy and electron diffraction results showed good agreement with the Xray analysis. The dependence of the resistivity changes on the ageing temperatures were also studied. The activation energy of the precipitation process was found to be ranged from 0.07 to 0.09 ev, below and above 443K respectively.

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Section: Resultsmentioning

confidence: 92%