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The % El. gradually decreased as the aging time increased, agreeing with the inverse relationship between strength and ductility. % elongation increased beyond 96 hours of aging where the strength began to drop substantially.
Mechanical properties of as-received Material Sample Hardness [BHN] 0.2% P.S [MPa] UTS [MPa] % El As-received Material 155 386 491 10.21% c.
Effect of aging time on a) UTS , b). 0.2% P.S, c). % El & d) Hardness for samples solutionised at 470ºC for 4 hrs. and 8 hrs. and aged subsequently at 120 ºC.
H.Loffler et al.[3] and M.Tanaka et al [14] have made a mention of PFZ formation in several 7XXX alloys.
The TEM results of this study were in agreement with the findings of Gang Sha et.al [15] & A.K.Mukhopadhyay et.al. [16].

Elnaggar1,2,a,*, AL-Hassan M.
El-Shall: ACS Catal.
El-bab, K.
El-Moneim: Key Eng.
El-naggar, and A.

As well as the 473 ceramics abstracts, the issue includes – in line with the new editorial policy of including original papers on all of the major material groups – the works: “The Effect of Defect Disorder on the Electronic Structure of Rutile TiO2-x” (Hossain, Murch, Sheppard and Nowotny), “Grain-Boundary-Defects-Induced Switching in Zn-Bi-Mo Ceramic” (El-Hofy), “Synthesis and Characterization of ZrW2O7(OH1-x,Clx)2▪2H2O (x = 0.016, 0.025)” (Cao, Deng, Ma, Wang and Zhao), “Modelling of the Gettering by Mechanical Damage of Metallic Impurities in Silicon” (Ayad and Remram), “Deep Trap Concentrations from Three-Dimensional Carrier Concentration Profiles in Hydride Vapor Pressure Epitaxially-Grown GaN” (Halder, Martin and Sisler), “Slow Positron Studies of Defects in Si-Doped GaAs” (Godbole, Badera, Shrivastava and Joshi), “Six-Jump-Cycle Mechanism for Collective Correlations in Nonstoichiometric Intermetallic Compounds” (Gosain, Chaturvedi, Belova and Murch), “Vacancy-Wind Factors and Collective
Correlation Factors in Nonstoichiometric B2 Intermetallic Compounds” (Gosain, Chaturvedi, Belova and Murch), “Defect Densities using the Positron Annihilation Doppler Broadening Technique in Wrought Alloys 3003 and 3005” (Abdel-Rahman, Kamel, Abo-Elsoud, Lotfy and Badawi), “Phenomenological Model for Creep Behaviour in Cu-8.5at%Al Alloy” (Abo-Elsoud), “Surface Microstructural Evolution up to Creep Rupture under the Power-Law Regime in Cu-8.5at%Al Alloy at Intermediate Temperatures” (Abo-Elsoud), “Effect of γ-Irradiation on the Mechanical Properties of Al-Cu Alloy” (Abo-Elsoud and Ismail), “On the Physics of the Anomalous Characteristics of Fickian Diffusion of Fe and Other Transition-Element Impurities in Crystalline Al at Elevated Temperatures” (Nechaev), “On the Physics of Enhanced Fickian Diffusion and Structural-Phase Changes in Intensively Deforming Metallic Materials” (Nechaev).

El Fatni, M.
El Fatni, S.
Bakhouya, et al., Modeling and performance analysis of a grid-connected polycrystalline silicon photovoltaic system under the maritime climate of El Jadida in Morocco.
El Fatni, S.
El Fatni, A.

[2] Zhou Hua, Wang Guojin, Fu Shaojun, et al.
[3] Wu Faquan, Liu Tong, Tang Xianliang, et al.
[7] Li Chaozheng, Shen Rong, Li Wei, et al.
[8] Li Weishu, Zhou Huoming, Chen Hua, et al.
[9] Dong Zerong, Zhao Hua, Huang Shijun, et al.

[3] Council, I.C., et al., International building code2000: International Code Council
[8] Barbat, A., et al., Active control of nonlinear base-isolated buildings.
[9] Yang, J., et al., Control of sliding-isolated buildings using sliding-mode control.
Luo, N., et al., Output feedback sliding mode control of base isolated structures.
[13] Spencer Jr, B., et al., Phenomenological model for magnetorheological dampers.

El-Sinawi*1,a, Omar A.
Niesser et al [1] have reported a fundamental frequency of 14.7 kHz (after geometry adjustment).
El-Sinawi, PhD.
[9] El-Sinawi A.
El-Sinawi.

Semi-Solid Casting of Al-7wt%Si Alloy in Expendable Molds H.
This paper reports the preliminary results of the effects of solid fraction, applied force and section thickness on the fluidity of Al-7.1 wt%Si semisolid slurry in the sand mold.
Al Si Fe Cu Mn Mg Cr Ni Zn Liquidus Temp.
Summary 1) Fluidity of Al-7.1 wt%Si semisolid slurry is improved by use of centrifuging force. 2) Fluidity increases approximately linearly with the square of the initial fraction liquid ( 2 Lf fL ∝ ). 3) Fluidity as a function of section thickness shows an exponential relation ( nr f eL ∝ ) where n is a function of external force and is independent of solid fraction. 4) Solid fraction changes along the length of the channels and is highest close to the sprue.
Xia, 3D study of the structure of primary crystals in a rheocast Al-Cu alloy, Materials Science and Engineering A, Vol. 283, Issues 1-2, 15 May (2000), pp. 70-75

As well as the abstracts, the issue includes original papers on the topics of “Quantum Conductance in Single-Walled Carbon Nanotubes” (H.Liu), “Dislocation Structures in Diamond” (A.T.Blumenau et al), “Diffusion of Light Elements in Diamond” (C.Saguy), “Defect Aggregation and Dissociation in Brown Type-I Diamonds” (F.De Weerdt et al), “Optical Study of Defect Distributions in CVD Diamond” (I.I.Vlasov and V.G.Ralchenko), “Diffusion of a Light Hydrogen Isotope in the III-V Nitrides” (R.L.Lichti), “Anisotropy of the Elastic Properties of Wurtzite InN Epitaxial Films” (V.S.Harutyunyan et al), “Experimental Studies of Defects, Implants and their Processes in Ion-Irradiated GaN Single Crystals” (W.Jiang et al), “Atomic Structures, Electronic States and Hydrogen Storage of BN Nanocage Clusters, Nanotubes and Nanohorns” (T.Oku et al), “Oxygen Permeability and Thermal Expansion of Ferrite-Based Mixed Conducting Ceramics” (V.V.Kharton et al), “The Chemical Diffusion Coefficient of the H Ion in Iridium
Oxide Films” (G.Yu), “Large-Scale Computer Modelling of Point Defects, Polarons and Perovskite Solid Solutions” (E.A.Kotomin et al), “H in ZnO: an Infrared Absorption Study” (E.V.Lavrov), “Investigation of the Diffusion Behavior near Grain Boundaries” (M.B.Park and N.H.Cho) and “Crystal Field Modification by Doping in HTC YBCO” (M.El-Hofy et al).

In the Ti-Al-Nb ternary phase diagram, there ia an (O+α2) phase region, as shown in Fig.1.
Fig.1 Schematic phase diagram of the Ti-Al-Nb ternary system.
B2 ＯＯＯＯ αααα2 %�b %Al (O+B2) (O+αααα2) B2 ＯＯＯＯ αααα2 %�b %Al (O+B2) (O+αααα2) Fig.2 Creep curves of three types of orthorhombic alloys.
Banerjee et al: Acta Metall.
Gogia et al: Intermetallics Vol.6 (1998), p.741