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El-Nahhas Faculty of Science, Physics Department, El-Minia University, PO 61519 El-Minia, Egypt *emadbadawi@yahoo.com Keywords: Age Hardening, HV Values, Plastic Deformation, Positron Annihilation Lifetime Spectroscopy Abstract The aim of this work is to establish a correlation coefficient between the positron annihilation lifetime technique (PALS) and the Vickers hardness for the heat treatable aluminum alloys (6066, 6063).The potential of positron annihilation spectroscopy in the study of light alloys is illustrated with special regards to age hardening, severe plastic deformation, annealing and quenching in aluminum alloys.
This time is short in comparison to the time spent by the positron in the metal before being annihilated, which is typically above 100 ps (e.g., 162 ps in Al).
Table 1 Chemical compositions of 6066, 6063 aluminum alloys Alloy Si Mg Cu Mn Cr Al 6066 0.9-1.8 0.8-1.4 0.7-1.2 0.6-1.1 0.4Max balance 6063 0.2-0.6 0.45-0.90 0.1Max 0.1Max 0.1Max balance If the metal contains defects such as vacancies, vacancy clusters (including voids and bubbles) and dislocations. i.e., regions of less than average atomic density, positrons may become trapped, i.e., localized at these defects.
A sandwich configuration has been used for Al alloy sample measurements.

Yasam et al. (2016) developed nifedipine loaded niosomes for the transdermal treatment of hypertension.
El Maghraby et al. (2015) in their study reported the preparation of proniosomes for nisoldipine transdermal delivery.
Al-Japairai et al., “Current trends in polymer microneedle for transdermal drug delivery,” Int.
Al-Japairai, and S.
El Maghraby, A.

Effects of Machining Parameters on Surface Roughness when Ultra-High Precision Diamond Turning RSA443 Optical Aluminum Zwelinzima Mkokoa and Khaled Abou-El-Hosseinb Precision Engineering Laboratory, Nelson Mandela University, Port Elizabeth 6031, South Africa as8502536@mandela.ac.za, bkhaled.abou-el-hossein@mandela.ac.za Keywords: Rapidly solidified aluminum, precision machining, surface roughness, diamond turning Abstract.
Zhang et al [2] noted that UPM had excellent capability of fabricating high-quality products with nanometric surface roughness.
To et al [5] investigated the effects the crystallographic anisotropy of single crystal aluminum rods in ultraprecision diamond turning.
Gautier et al [7] reported on a study of diamond machining of Al2017- alloy and pure aluminum.
Shekh et al [8] reported on a study on machining Al6061 to establish the effect of controllable machine parameters.

El Kadiri, R.
El Kadiri, R.
Czyrska et al.: Solid State Ionics Vol. 117 (1999), p. 13 [14] B.I.
Jedlinski et al.: Appl.
El kadiri: Doctoral Thesis, ENSMP (2003) [18] H.J.

Numerical Simulations of Heat Transfer in Plane Channel Flow Najla El Gharbi1, 3, a, Rafik Absi2, b and Ahmed Benzoui3, c 1Renewable Energy Development Center, BP 62 Bouzareah 16340 Algiers, Algeria 2EBI, Inst.
Kasagi et al. [2] revisited the problems employing a constant time-averaged heat flux boundary condition on the walls, for a mild Reynolds number of 4580.
Most of LRN models were developed based on the High-Reynolds k-e model (Lam and Bremhorst [7], Chien [8], Abe et al., [9], Chang et al., [10]).
Results and Discussion To study the flow near the wall, we tested four turbulent model compared to DNS of Iwamato et al. [14 ] and DNS of Kasagi et al.[2]: k-e standard with EWT, SST k-ω and the two k-e models with LRN models; AKN and CHC.
El Gharbi, R.

Lillo et al. work on Al 6061-B4C composite through powder metallurgy route has shown the presence of B4C particle agglomerates and residual porosity[5].
The 80%Al-20%-B4C, 80%Al-20%Cu-B4C and 80%Al-20%Ni-B-B4C powders were blended and mixed, uniaxially cold compacted at 1.2 tonnes load to form cylindrical pellet of 10 mm diameter and 15 mm height.
(a) (b) (c) Figure 1: (a) XRD micrographs of B4C and coated B4C, SEM micrographs of (b) El Cu coated B4C and (c) El Ni-B coated B4C particles under optimum condition The variation of radial apparent density of green and sintered composites with coated and uncoated B4C particles is depicted in Table 1.
An Al-Ni and Al-Cu intermetallic layer formed around the B4C particle reduces Al-B4C interfacial reaction products and melting temperature of the matrix, contributing better wetting of the B4C particles[11].
Fig. 2 shows the SEM microstructure of sintered samples of Al-B4C, Al-Cu-B4C, and Al-Ni-B-B4C composite prepared and the effect of coating on particle distribution.

El-Shenawy1,a*, Hoda Refaiy2,b and Hoda Nasr El-Din3,c 1,2,3Central Metallurgical Research and Development Institute (CMRDI), Helwan, Cairo, Egypt.
Table1.The chemical composition of the studied steel alloy Element C Si Mn P S Mo Ni Al Nb Wt.% 0.35 0.6 1.5 0.02 0.008 0.25 1.5 1.1 0.05 The cast steel specimens were homogenized at 1250 ºC for 2 hours in a muffle furnace, and then furnace cooled.
Park et al [14] investigated roles of tempering temperature and the holding time on the decomposition of retained austenite and the redistribution of alloying in a conventional TRIP steel alloy using transmission electron microscopy.
El-Din , E.
Lee et al. / Scripta Materialia 65 (2011) 225–228

At T = 250 °C, the ultimate tensile strength and yield strength of the rheo-cast 7075-T6 Al alloy were higher than those of the wrought 7075-T651 Al alloy.
Introduction Wrought 7075 Al alloy is the highest strength Al alloy.
Although the tensile property of GISS 7075-T6 Al alloy does not reached that of wrought 7075-T651 Al alloy, it is comparable to that of the alloy produced by other semi-solid process.
The samples of the GISS 7075-T6 Al alloy are referred to as “GISS” through the rest of this report while the wrought 7075-T651 Al samples are called as “wrought”.
Fig. 2.UTS, YS and %El of both alloys at various test temperatures.

Suad Khalid Al Bahar Dr.
Jingying Zhao Sponsors and Committees General Chair David Packer, International Science and Engineering Research Center, Hong Kong Scientific Committee Chair Konstantinos GIANNAKOS, Fellow of ASCE, University of Thessaly, Greece International Committee & Scientific Committee Ali Rahman, Jundi-Shapur University Technology, Iran Anuchit Uchaipichat, Vongchavalitkul University, Thailand Ata El-kareim Shoeib Soliman, Faculty of Engineering El-Mataria, Egypt Badreddine Sbartai, Université de Skikda, Algeria DAVID S.
Technology, Taiwan HoseinRahnema, Yasuj University, Iran Jian YANG, University of Birmingham, UK Jianping Han, Lanzhou University of Technology, China Jianqing Bu, Shijiazhuang Tiedao University, China Jia-Ruey Chang, MingHsin University of Science & Technology, Taiwan Konstantinos GIANNAKOS, University of Thessaly, Greece Lan WANG, Inner Mongolia University of Technology, China Malagavelli Venu, BITS, Pilani, India MANJEET SINGH HORA, Director, MANIT Bhopal, India Mehmet Serkan KIRGIZ, Hacettepe University, Turkey Moghadas Nejad, Amirkabir University of Technology, Iran Mohammadreza Vafaei, Imenrah Consulting Engineers Co., Iran Mohammadreza Yadollahi, Universiti Teknologi Malaysia, Malaysia Mubiao Su, Shijiazhuang Tiedao University , China Niyazi Ugur Kockal, Akdeniz University, Turkey Ruey Syan Shih, Tumgnan University, Taiwan Shengcai LI, Huaqiao University, China Sina Kazemian, SCG Consultant Company, Selangor, Malaysia Suad Khalid Al-Bahar

Ichitsubo et al. [5] explored elastic constants of lotus-type porous copper.
of Nakajima [27] and Ichitsubo et al. [5] model, as shown in Fig. 9.
International Journal of Engineering Science 2015, 97, 60-68. https://doi.org/10.1016/j.ijengsci.2015.08.012 [14] Kaddouri W, El Moumen A, Kanit T, Madani S, Imad A.
M., El Minor H.
https://doi.org/10.1016/j.mechrescom.2014.03.005 [24] El Moumen A, Kanit T, Imad A, El Minor H.