Search results

Study of Precipitation Hardening in Two Al-Mg-Si Alloys with and without Copper and Excess Silicon Using Kissinger and Boswell Methods Fares SERRADJ1,a*, Hichem FARH2,3,b and Brahim BELFARHI1,c 1Physics Laboratory of Guelma (LPG), May, 8th 1945 Guelma University, Algeria. 2Department of Material Sciences, Faculty of Exact Sciences, Larbi Tebessi University 12002, Tebessa, Algeria 3Laboratoire des Composants actif et Matériaux, Oum el Bouaghi, Algeria aserradj.fares@univ-guelma.dz, bfarhichem@gmail.com, cbelfarhi.brahim@univ-guelma.dz Keywords: Al-Mg-Si alloys, DSC, TEM, XRD, precipitation, activation energy, excess Si, Kissinger-Akahira-Sunose & Boswell isoconversional methods.
In Al-Mg-Si alloys, copper is an alloying element increasing volume fraction of precipitates.
Dunlop, The precipitation sequence in Al-Mg-Si Alloys, Acta.
Buffat, Structural phase transition in Al-Cu-Mg-Si alloys by transmission electron microscopy study on an Al-4 wt% Cu-1 wt% Mg-Ag alloy reinforced by SiC particles.
Daroqui, Revision of the solvus limit of Al-Mg2Si pseudo binary phase diagram, Procedia.

MAC routing protocol Ahutu, O.R. and El-Ocla, H.,[12] have designed a centralized MAC routing protocol in order to support an infrastructure less network to handle the energy consumption and thereby improve the performance of the network.
Data transmission rate and congestion of network is not considered. [12] Ahutu, O.R. and El-Ocla, H., 2020 C-MAC Detects the wormhole attack efficiently, has less control heads and also improved efficiency Reduces the overheads and detects the wormhole attack.
Al Sibahee, M.A.
[12] Ahutu, O.R. and El-Ocla, H., 2020, November.
[36] Al Shehri, W., 2017.

Spin statistics predicts [7] that the maximum internal quantum efficiency for EL cannot exceed 25% of the PL efficiency, since the ratio of triplets to singlets is 3:1.
Generally the cathode will be a low-to-medium work function (φ) metal such as Ca, Al or Mg, Ag layers.
Deng et al [19] used SiO2 film as a hole injecting buffer layer.
Though the EL efficiency showed an increase with such buffer layers, such additional layers resulted in higher turn-on voltages.
The device structure used for this study consists of ITO/PEDOT: PSS/ AlQ3/Al layers.

Other elements detected include sulfur (S) (0.8%), Ca (0.5%), Al (0.3%), and titanium (Ti) (0.5%).
El-Shekeil, M.U.
El Mansouri, F.
El Mansouri, M.A.
El-Shekeil, S.M.

Taniguchi et al. [62]; where as two distinct ferroelectric phases in this multiferroic Y-type hexaferrite have been studied by Sagayama et al. [91].
Abo El Ata and M.
El-Saadawy: J.
El Hiti and A.
Abo El Ata: J.

An influential review of such methods was written by Doebling et al.[17].
Relatively recently, in the quest for accurate time and frequency resolution, Huang et al. [27] proposed the Empirical Mode Decomposition method (EMD).
Shevitz et al., “Damage and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review”, 1996, Los Alamos National Laboratory
El Badaoui, F.
El Badaoui, F.

Dong et al proposed the integrated charge planning based on flexible jobs [7].
Based on the research of Dong et al [7, 8, 10], the first level problem is solved.
Operations Research, 1977, 25(1):45-61 [7]Dong, H.Y., et al.
Y., et al.
[9]Graham R.L., Lawler E.L., Lenstra J.K., et al.

Ghosh, et al: Indian J.
El-Behery: Text.
Riser, et al: Text.
Ghosh, et al: Proc.
Guo, et al: Text.

It is shown that the flame retardant properties of MHSH better than that of Mg(OH)2 Table 3 Oxygen Index of the HDPE Samples with Different Additive Formula properties Properties Pure HDPE Adding shares of magnesium hydroxide in 100 Shares of HDPE Adding shares of MHSH in 100 Shares of HDPE 10 20 10 20 OI 17 18.3 19.6 22.8 24.2 The thermal decomposition properties of MHSH、Mg(OH)2 and Al(OH)3 are listed in table 4.It can be seen from the table 4, the temperature of beginning to release the water of MgSO4·5Mg(OH)2·2H2O was higher than that of Al(OH)3.There are two absorption temperature peaks: 190.86˚C and 406.79˚C respectively.Two peaks are corresponding to the thermal decomposition of regional 340~440˚C of the polyethylene, and the heat of absorption was higher than that of Mg(OH)2.Therefore, the MHSH overcame the faults that low decomposition temperature of Al(OH)3 and the high heat of Mg(OH)2, and the polyethylene oxygen index of adding MHSH was higher than the polyethylene oxygen
Table 4 Main Pyrogenation of the Inorganic Flam Retardant Bound water per mol (%) Decomposition temperature（℃） Heat absorption (J/g) Al(OH)3 24.6 200 1968 Mg(OH)2 31 340 773 MgSO4·5Mg(OH)2·2H2O 36.05 290.86, 406.79 >300,000 Conclusions MHSH enhancement of high density polyethylene and flame retardant materials are more than the effect of magnesium hydroxide.
[2] Hongdian Lu, Xiaoling Yu, Jianguo Shao, et al.
[4] DEN JP, LIANG SJ, ZHANG CR, et al.
[6] EL-NASHAR DE, MAZIAD NA, SADEK E M..

Tyber, K. et al.
Feng, et al.
Li, et al.
El-Gizawy, R.
Lee, et al, J.