Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Stir casting


Effect of B4C/Fly Ash Addition on Wear and Mechanical Properties of Al-Cu-Mg Alloy

I.A. Alkadir; L.S. Salim

Engineering and Technology Journal, 2017, Volume 35, Issue 4, Pages 301-310

This research studied the effect of adding fly ash and boron carbide (B4C) particulates reinforcement on the mechanical properties and wear resistance of Al- 4.5% Cu- 1.18% Mg matrix alloy. Stir casting method has been used to fabricate the alloy and hybrid composite samples containing 2wt% of B4C and 5, 10, 15،20 wt % fly ash. The x-ray inspection revealed the dispersion of intermetallic compounds (Al2Cu,MgO and SiO2) Also, the mechanical properties have been evaluated, the results showed an increase in the tensile and yield properties with the increase of weight percentage of fly ash content up to 15 wt%, but the elongation decreased, while the hardness increased. Wear rate examination has been concluded by using pin on disc apparatus under different loads of (5, 10, 15) N, sliding velocities (1.413, 2.827, 4.241) mm/sec, and different times of (5, 10, 15) min. The results showed decrease in wear rate at 20% fly ash composite sample when compared with other composites samples and base alloy.

Effect of The Reinforcing by WC on Microhardness, Roughness and Corrosion Behavior of Al-12Si Alloy

Hiba Anwer Abdullah

Engineering and Technology Journal, 2016, Volume 34, Issue 15, Pages 2891-2896

This work investigated the effect of Tungsten Carbide as reinforcement with 1, 2 and 3 wt.% on some properties of matrix Al-12Si alloy. Al-12Si/WC composites were fabricated by stir casting method. Micro hardness and roughness have been tested to investigate the role of WC reinforcing. Corrosion behavior of these composites also investigated in 0.2M HCl solution using the potentiostat instrument.
The results show a good incorporation between the matrix and WC particles with probability to form Al12W and Al4C3 phase in addition to eutectic structure of Al-12Si alloy. The micro hardness was increased with increasing the weight percent of WC, while the roughness was decreased due to the better interfacial bonding. Corrosion protection properties of composites were better than that of base alloy due to the behavior of WC as a cathodic site which reduces the dissolution of metals from the metallic surface.

The Inhibition of Corrosion for Metal Matrix Composites Reinforced with Nano Alumina in Al–Fao Water by Thiourea

Mohammed Saieed Waheed; Niveen J. Abdalkadir

Engineering and Technology Journal, 2015, Volume 33, Issue 8, Pages 1445-1457

In the present investigation, the static electrochemical corrosion behavior of nano (Al2O3)P based aluminum in Al –Fao water with and without inhibitor was compared. The nanocomposites were fabricated by using liquid metallurgy technique. The effect of inhibitors for nanoparticulates weight percentage on the corrosion rate was studied. The corrosion rate was increased by increasing weight percentage of the nanoparticles, the Al/ 5% nano (Al2O3)P composites exhibited the highest corrosion resistance among all the investigated nanocomposites with and without inhibitors. The obtained results signified that the mechanism of adsorption of thiourea molecules on the MMC surface was by physisorption.

A Comparative Corrosion Studies of Aluminum Metal Matrix Composites Reinforced with nano (Al2O3 and SiC) Particles In Fao Water

Mohammed Saieed Waheed; Niveen J. Abdalkadir

Engineering and Technology Journal, 2015, Volume 33, Issue 4, Pages 723-732

In the present investigation, the static electrochemical corrosion behavior of nano (Al2O3)P and nano (SiC)P based aluminum in Fao water was compared. The nanocomposites were fabrication using liquid metallurgy technique. The effect of nanoparticulates weight percentage (5%, 15% and 25%) on the corrosion was studied. The results showed that the Al reinforced with nano (Al2O3) composites exhibited lower corrosion rates that the Al reinforced with nano (SiC)Pcomposites.
The corrosion rate was found to be increased by increasing of the weight percentage of the nanoparticles more than 5% nano (Al2O3)P composites exhibited the highest corrosion resistance among all the investigated nanocomposites.