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In this paper, the Al-Li alloy sheet YAG laser welding processing trial were conducted to research on it by the pores of Al-Li alloy weld detecting and microscopic analysis.
Figure 2 shows typical weld shape of YAG laser welding 5A90 Al-Li alloy sheet.
The porosity SEM feature on weld fracture of laser welding 5A90 Al-Li alloy metallurgical porosity　 unstable keyhole porosity Control methods of weld Porosity for laser welding Al-Li alloy Surface treatment before welding.
New approaches to alloy development in the Al-Li system .
El-Batahgy andM.

The flow stress of Al-Cu-Li-Mg-Ag alloy during hot deformation can be expressed by a Zener-Hollomon parameter in the hyperbolic-sine function with the hot deformation activation energy H∆ of 250.45kJ/mol.
Experimental Procedure The Al-4.0Cu-1.0Li-0.4Mg-0.4Ag alloy was prepared by melting and casting under argon atmosphere.
Results and Discussion The true stress-strain curves of Al-Cu-Li-Mg-Ag alloy during hot compression are given in Fig.1.
Fig.6 Precipitates in Al-Cu-Li-Mg alloy afer hot deformation (a) 360��� 0.001s -1 , (b) 400� � 1s -1 4.
Vol. 25(1990),p.1137 [2] T.Sheppard and A.Jackson:Mater.Sci.& Tech.Vol.13(1997),p.203 [2] H.Shi,A.J.mclaren,C.M.Sellars el al:Mater.Sci.& Tech.Vol.13(1997),p.210 [4] Z.Chen,Z.Zheng:J.Wuhan University of Tech.

Al2O3 3970 10844 6421.4 46.685 16.370 Epoxy 1142 2654.5 1175.6 0.805 0.158 *The parameters listened in Table 1 were obtained and calculated using the physical parameters from Yao et al. [13].
El-Kady: Measurement Science and Technology Vol. 20 (2009), p. 012002
El-Naggar, S.I.

Tanaka et al. [3] reported that during control rolling of niobium bearing HSLA steel, 50% deformation in the temperature range of 1050-11000C produces as fine as 20 µm grain size.
During tapping, low carbon Fe-Mn, Fe-Si and Al were added in the ladle to deoxidize the steel and achieve the chemistry.
Al addition was made at the end when the ladle was more than half filled.
After tapping, some Al chips were also added on top of the slag to deoxidize it.
Ghosh et al.: Materials Science and Engineering Vol.

Engeln et al. [2] examined the uniaxial extension of polytetrafluoroethene (PTFE).
El-Tonsy et al. [3] observed the behaviors of polypropylene (PP) and high-density polyethylene (HDPE) during stretching.
Compañ et al. [8] investigated co-extruded linear low-density polyethylene films.
Ishihara et al. [9~11] observed PET films after stretching.
El-Tonsy, M.S.

The EL intensity of diodes is measured by a luminance meter (Minolta LS-110).
Brown, et al: Nature.
Liang, et al: J.
Chen, et al: Adv.
Niazimbetova, et al: Chem.

Elias1,f 1Faculté des Sciences, Département de Chimie, Université Mouloud Mammeri 15000 Tizi-Ouzou, Algérie 2 Laboratoire de Technologie des Matériaux, Département de S.D.M, Faculté de Génie Mécanique et Génie des Procédés, B.P N°32, 16111, El-Alia, Bab-Ezzouar, Alger, Algérie aNait_zahra@yahoo.fr , bchegroune_redouane@yahoo.fr, ckeddam@yahoo.fr, dboudj2k@yahoo.fr, el_haddour@yahoo.fr , fhamghil@yahoo.fr Keywords: Calphad, Phase stability, Chemical potential, Gibbs energy, thermodynamics.
In this context, Ramdan et al. [6] have used an approach based on the Calphad Method [7] to model the growth kinetics of the phase using the phase-field method, where the Gibbs energies of the pure elements as a function of temperature are taken from the SGTE compilation by Dinsdale [8].
In particular, the authors Hallemans et al. [9] and Van Rompaey et al. [10] have studied in detail the Fe-B system using the Calphad approach.
Alternative Approach to Study the Thermodynamic Equilibrium between the Fe Phase and the Fe2B Phase The thermodynamic approach used by Huh et al. [12] was also applied by Ramdan et al. [6] to allow for the variation of the boron solubility in the phase.
The second thermodynamic approach inspired from the works of Huh et al. [12] has overestimated the value of the boron solubility in the phase in equilibrium with at 1300 K.

For example, Pogure et al. describe the detection of Car wheel blade, turbine disc, nuclear power station and aeronautical material by phased array method.
Son et al. [8], Chatillon et al. [9] and Mahaut el al. [10] All describe the application of ultrasonic phased arrays in the nuclear power industry.
Song et al. describes the inspection of turbine blade roots using a 64 elements array with a centre frequency of 7.5MHz and Mahart el al. describe the inspection of metal welds in thick 30-50mm steel plates using a 24 elements with centre frequency of 2.25MHz.
Gilmore, et al.
Odakura, et al.

El Harrouni1 , J.M.
For substrates doping level imaging of both n-type, in the range 1017cm-3 - 1019cm-3, and p type (Al) in the range 10 16cm-3 - 1018cm-3, optical absorption can be used [6].
For the best of our knowledge no data have been published on the radiative recombination coefficient in SiC except one work from Galeckas et al. [8].
El Harrouni and G.

El-Harrouni(2), Y.
On the spectrum, a donor acceptor band of recombination between Al-N and a band centred around 540nm maybe due to recombination from C-B to the deep boron acceptor arise from the substrate [3].
In this case the forbidden TO of E1 4000 5000 6000 7000 0,000 0,005 0,010 0,015 0,020 N-Al DAP Broad band PL intensity (u.a.)
El-Harrouni, J.M.