Study some mechanical properties for aluminum composites using atomization process

Other Title(s)

دراسة بعض الخواص الميكانيكية لمتراكبات الألمنيوم باستخدام عملية التذرية

Dissertant

al-Qassab, Sadim Abbas Fadil

Thesis advisor

Jafar, Harith Ibrahim
al-Ajaj, Ikram Ata

Comitee Members

Nasir, Iman M.
Habubi, Nadir Fadil
Qasim, Qasim S.
al-Haddad, Rad M. S.
Jabur, Akram Rahim

University

University of Baghdad

Faculty

College of Science

Department

Department of Physics

University Country

Iraq

Degree

Ph.D.

Degree Date

2011

English Abstract

Steel fiber aluminum matrix composites were prepared by atomization technique.

Different air atomization conditions and different parameters were considered.

XRD and XRF results of the raw materials showed that the used raw materials are Al-2024 and steel carbon mesh.

XRD result for the aluminum as sprayed sample showed that it is composed of aluminum only with no observable oxidation in the resulted major peaks appeared.

Tensile test, bending test and Brinell hardness test properties in addition to the microstructural tests were used to evaluate the best taken preparation conditions of the samples.

Different values of air atomization pressure (3, 4, 5, 6 and 8 bar) were studied.

The best value of tensile strength and three point bending flexure strength was at atomization pressure equal to 4 bar.

Different values of substrate to nozzle distance (12, 14, 16 and 18 cm) were taken at certain atomization pressure equal to 8 bar.

The best value of tensile strength was found at distance of 12 cm.

For Brinell hardness, the best result was at distance equal to 18 cm.

In three point bending the best result was obtained at distance equal to 14 cm.

Two values of substrate temperature (room temperature and 110 oC) were used to study the effect of substrate temperature.

The raising of substrate temperature leads to lowering the tensile and bending strength.

This is due to the differences in coefficient of thermal expansion between aluminum and steel carbon fibers The effect of reinforcement of aluminum with steel fiber is also studied by comparing the results of mechanical test of the aluminum samples with samples that have one layer and two layers (with relative rotation angle of zero and 45o) of steel carbon mesh.

The results showed that the samples that are reinforced with one layer are degraded in their tensile and bending strength.

The samples that reinforced with two layers of steel carbon mesh with 45o relative rotation between meshes showed higher bending strength than the samples that are reinforced with one layer.

The annealing process for most samples was accomplished at 400oC for an hour to study its effect on the mechanical properties.

Generally, the results showed that the annealing process degraded the tensile and three point bending strength and Brinell hardness for the good cast samples (which have no porosities affecting the mechanical properties), But for high porosity samples the annealing process raise their mechanical properties because it lessen the porosity of the samples.

The effect of using Nitrogen gas in atomization instead of air appears in raising the Young modulus of the samples, but the tensile strength and the three point bending strength are not affected by that.

Young modulus results showed that the best result occurred with an air atomization pressure equal to 8 bar and sample to nozzle distance equal to 16 cm.

Main Subjects

Physics

No. of Pages

143

Table of Contents

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Language

English

Data Type

Arab Theses

Record ID

BIM-606370