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Study some mechanical properties for aluminum composites using atomization process
Other Title(s)
دراسة بعض الخواص الميكانيكية لمتراكبات الألمنيوم باستخدام عملية التذرية
Dissertant
Thesis advisor
Jafar, Harith Ibrahim
al-Ajaj, Ikram Ata
Comitee Members
Nasir, Iman Muzhir
Habubi, Nadir Fadil
Qasim, Qasim S.
Jabur, Akram Rahim
al-Haddad, Rad Muhammad Salih
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
No. of Pages
142
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction.
Chapter Two : Theoretical view of the work.
Chapter Three : Atomization system, preparation of samples and measurements.
Chapter Four : Results, discussion and conclusions.
References.
American Psychological Association (APA)
al-Qassab, Sadim Abbas Fadil. (2011). Study some mechanical properties for aluminum composites using atomization process. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-608248
Modern Language Association (MLA)
al-Qassab, Sadim Abbas Fadil. Study some mechanical properties for aluminum composites using atomization process. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad. (2011).
https://search.emarefa.net/detail/BIM-608248
American Medical Association (AMA)
al-Qassab, Sadim Abbas Fadil. (2011). Study some mechanical properties for aluminum composites using atomization process. (Doctoral dissertations Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-608248
Language
English
Data Type
Arab Theses
Record ID
BIM-608248