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The effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of Al-Zn-Mg-Cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques

Doctor of Philosophy in Materials Engineering

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Bibliographic Details
Main Author: Naeem, Haider T.
Other Authors: Kahtan S., Mohammed, Dr.
Format: Thesis
Language:English
Published: Universiti Malaysia Perlis (UniMAP) 2015
Subjects:
Metals > Microstructure
Materials > Mechanical properties
Metals > Mechanical properties
Powder metallurgy
Online Access:http://dspace.unimap.edu.my:80/xmlui/handle/123456789/78188
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spelling my.unimap-781882023-03-23T02:43:47Z The effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of Al-Zn-Mg-Cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques Naeem, Haider T. Kahtan S., Mohammed, Dr. Metals -- Microstructure Materials -- Mechanical properties Metals -- Mechanical properties Powder metallurgy Doctor of Philosophy in Materials Engineering Casting and alloying, powder metallurgy (PM) and Friction Stir processing (FSP) techniques were used to produce Al-Zn-Mg-Cu alloy of superior properties. The main objective of this research is to improve the microstructure, mechanical properties, corrosion and solid particle erosion resistance of Al-Zn-Mg-Cu alloys. Conventional casting route includes the production of Al-Zn-Mg-Cu alloys with and without Ni, Sn and Co additives using a semi direct chill casting technique, thereafter homogenization treatment at different conditions to the as cast Al-Zn-Mg-Cu alloys had carried out. Additionally, hot extrusion process at 450°C on some homogenized Al-alloys was applied to induce working stress in the surface to improve its erosion resistance. Aging at T6 (120°C/24h) and retrogression and reaging (RRA) at (120°C/24h+180°C/30min+120°C/24h) were conducted on non-extruded and extruded Al-alloyed samples. Comparison the strength and hardness values of Al-Zn-Mg-Cu alloy underwent RRA, was about of 380 MPa and 211 Hv with similar Al-alloy of Ni and Co additives underwent similar heat treatment after extrusion showed that the maximum tensile strength acquired were on the order of 665 MPa and hardness of about 265 HV. On the other hand, powder metallurgy routes comprised both mixing and ball milling (BM) processes. Al-Zn-Mg-Cu compacted from their as received powder mixtures were produced. Other Al-Zn-Mg-Cu with Ni or/and Co or Al2O3 samples were produced for comparison purpose. All the mixed and ball milled Al-PM alloys were cold compacted and sintered under argon atmosphere at 650°C/2hr then and underwent homogenization at 470°C/1.5hr, and followed by aged at T6 and RRA treatment. Findings showed that the saturation limits of the alloying elements were changed. The solubility of nickel in the PM Al-alloy underwent ball milling was extended. In fact, this was the primary target of the mechanical alloying (MA) brought about by BM process application. Additionally, there was a notable increase in hardness and the sintered density for the BM Al-PM alloy of Ni and Co additives after the RRA process. Microhardness of 107 Hv and an increase in the sintered density of 11.5% g/cm3 were acquired as compared to the similar Al-alloy which underwent the similar sintering conditions without additives. 2015 2023-03-23T02:41:35Z 2023-03-23T02:41:35Z Thesis http://dspace.unimap.edu.my:80/xmlui/handle/123456789/78188 en Universiti Malaysia Perlis (UniMAP) Universiti Malaysia Perlis (UniMAP) School of Materials Engineering
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Metals -- Microstructure
Materials -- Mechanical properties
Metals -- Mechanical properties
Powder metallurgy
spellingShingle Metals -- Microstructure
Materials -- Mechanical properties
Metals -- Mechanical properties
Powder metallurgy
Naeem, Haider T.
The effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of Al-Zn-Mg-Cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques
description Doctor of Philosophy in Materials Engineering
author2 Kahtan S., Mohammed, Dr.
author_facet Kahtan S., Mohammed, Dr.
Naeem, Haider T.
format Thesis
author Naeem, Haider T.
author_sort Naeem, Haider T.
title The effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of Al-Zn-Mg-Cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques
title_short The effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of Al-Zn-Mg-Cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques
title_full The effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of Al-Zn-Mg-Cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques
title_fullStr The effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of Al-Zn-Mg-Cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques
title_full_unstemmed The effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of Al-Zn-Mg-Cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques
title_sort effect of nickel, cobalt and tin on the evolution of microstructural and mechanical properties of al-zn-mg-cu alloys (7000 series) via casting, powder metallurgy and friction stir processing techniques
publisher Universiti Malaysia Perlis (UniMAP)
publishDate 2015
url http://dspace.unimap.edu.my:80/xmlui/handle/123456789/78188
_version_ 1772813093254987776
score 13.214268

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