Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Alloy

Prediction of Fatigue-Creep Interaction Life of Aluminum Alloy AA7349 Using Electromechanical Devices

Hussain J. Al-Alkawi; Fikrat Abdul Kareem; Asmaa Abdulqasim Mohammed Ali

Engineering and Technology Journal, 2015, Volume 33, Issue 3, Pages 535-547

In this present work, the behavior of AA7349 aluminum alloy under constant and cumulative creep-fatigue interaction has been studied by using an electrical system designed and built in order to investigate creep-fatigue interaction at different stress levels and temperatures. An hour-glass shaped specimen of AA7349 aluminum alloy has been subjected to a constant and variable creep-fatigue tests performed under rotating bending loads and stress control at stress ratio R=-1.
The results of the creep –fatigue life have been studied byMiner rule and compared with the proposed and experimental methods. It was shown that theMinerrule and proposed modelgive reasonable results and they are in a good agreement with the experimental fatigue lifetimes.

Corrosion Inhibition of Aluminum Alloy 7613 by Dimethylethanolamin in (0.6 M) NaCl Solution

Khalid T. Rashid

Engineering and Technology Journal, 2012, Volume 30, Issue 4, Pages 684-696

The inhibition behavior of Dimethylethanolamin (DMEA) on corrosion 7613
Aluminum alloy in 0.6 M NaCl solution have been investigated using weight loss,
polarization techniques .Five different concentrations (2*10-3, 4*10-3, 6*10-3 ,
8*10-3 and 10*10-3) M of (DMEA) were studded at 250 C. Also examine of
temperature effect (25, 35, 45)0 C on the inhibitor efficiency .The results indicated
that the inhibition occurs by absorption of inhibitor molecules on the metal surface.
The inhibition efficiency (I %) was found to increase with increasing inhibitor
concentration and decreasing with increasing temperature. For inhibitor
concentration close to (8*10-3 M) maximum inhibition efficiency obtained was 92
%. Above this inhibitor concentration value in the solution the inhibitor efficiency
Polarization measurements showed that the DMEA act as a mixed type inhibitor.
The corrosion potential (Ecorr.) values shifted to less negative values by increasing
the concentration of DMEA in the solution up to (8*10-3 M). Adsorption of DMEA
on the surface of Aluminum is found to obey the Langmuir isotherm

Corrosion Resistance of Aluminum Alloy 7020-T6 in Sea Water

Mustafa Khaleel Ismael

Engineering and Technology Journal, 2011, Volume 29, Issue 8, Pages 1482-1490

The present work is aimed to investigate the effect of heat treatment on corrosion resistance of Al-alloy 7020-T6 in sea water, the specimens which manufactured by (1.5*1.5*0.2) cm, according to ASTM (G31-72) [1] The heat treatment was carried out at 480°C and water quench after that artificial aging are implemented at temperature 150°C for (1, 4) hours. Microstructure and phase properties after heat treatment and corrosion test were investigated by optical microscope; X-ray diffraction and
computer potentiodynamic polarization technique have been used to study corrosion behavior in 3.5% NaCl. The results of corrosion resistance 7020-T6 decrease by solution heat treatment and, increase the holding time from 1- 4 hour would increase the corrosion rate, Intermetallics compounds containing zinc represent as the sacrificial anode and control pitting corrosion in 7020-T6 alloy also, the artificial
ageing time increase the precipitation of zinc and decrease pitting corrosion at 1 hour.

Fatigue of Cu 65400 Alloy under Laser treatment

Hussain J. M. Alalkawi; Raad H. Majid; Rawaa A. Alomairy

Engineering and Technology Journal, 2011, Volume 29, Issue 8, Pages 1509-1516

Fatigue tests were done to determine the S-N curves for Cu 65400 alloy
specimens .The effect of laser shotting on the fatigue properties were investigated with stress ratio R=-1 at room temperature. Laser shotting of this alloy increases the life, endurance limits and compressive residual stresses. The largest increase in compressive residual stresses were observed at stress level 350 MPa.

One Parameter Composite Semigroups of Linear Bounded Operators in Strong Operator Topology of Schatten Class Cp

Samir Kasim Hassan; Al-Taie M; Al-Malki Anam; Al-Attar Abeer; Mustafa Khaleel Ismael; Fatema Ahmed Sadeq; Radhi A .Zboon; Jehad R.Kider; Samir K .Hassan; Hussain J. M. Alalkawi; Raad H. Majid; Rawaa A. Alomairy; Luma Abdul Ghani Zghair; Hadia Kadhim J.Al-Ogili; Assifa M. Mohamad; Abbas Sheyaa Alwan; Haider L. Aneed; Assim H Yousif; Salema Sultan Salman; Abbas Hussien Miry; Abduladhem A.Ali; Mohammed Zeki Al-Faiz; Sabah N. mahmood; Khansaa Dawood Selman; Shaymaa Tareq Kadhim

Engineering and Technology Journal, 2011, Volume 29, Issue 8, Pages 1463-1470

For semigroups of linear bounded operators on Hilbert spaces, the problem of
being in Cp , 0 Keywords