(JNTM) مجلة التكنولوجيا الجديدة والمواد

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Browsing (JNTM) مجلة التكنولوجيا الجديدة والمواد by Subject "Activation energy"

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    Microstructural Characterization, Mechanical Properties And Recrystallization Kinetics Of Low Carbon Steel Wires
    (Oum-El-Bouaghi University, 2020) Larouk, Zeghda; Ayad, Abdelhak; Bouhalais, Hocine; Khantoul, Ahmed Reda
    The present study deals with two steel wires containing different amount of carbon. The optical and Secondary Electron microscope (SEM) are used to identify the microstructure of steels in as-received and deformed conditions. The results show that the mechanical and structural properties are affected by the carbon content. It is found that the kinetics of primary recrystallization is described by Avrami law at 500°C and the rate of primary recrystallization depends on carbon content. The two parameters (k and n) in Avrami law are calculated and the activation energy for primary recrystallization is found to be lower for the low carbon content steel.
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    Study Of New Antimony Phosphate Glasses
    (Oum-El-Bouaghi University, 2020) Agti, Fatima Zohra; Soltani, Mohamed Toufik; Santos, Luis F.; Messaoudi, Abdelghaffar; De.ligny, Dominique
    Crystallization kinetic studies of ternary antimonite glasses within the 60 Sb2O3-(40-x) NaPO3-xWO3 system x= (5, 15) were prepared using the melt quenching technique were performed by non-isothermal methods using differential scanning calorimetric (DSC) its measurements showed glasses a very stable with the addition of WO3. The kinetic parameters Ea and n by applying Ozawa and Chen methods were found to be in good agreement with each other the values of crystallization activation energy were calculated in the range of 49, 30 Kcal.mol-1 (Chen) and 52, 33Kcal.mol-1 (Ozawa) and Avrami constant, nmoy(SN5W)=2.05, nmoy(15W)= 2,01correspond decreasing nucleation rate. The evolution of hardness appears increases linearly versus tungsten content in the glasses; the hardness is close from 325 to 425. This study could open new avenues of research for ternary antimony-based glasses for applications in nonlinear properties.