Microstructure Analysis, Mechanical Properties And Corrosion Behaviour Of Cryorolled Aluminium 1100 Alloy With Different Heat Treatment

Zakaria, Siti Aminah (2018) Microstructure Analysis, Mechanical Properties And Corrosion Behaviour Of Cryorolled Aluminium 1100 Alloy With Different Heat Treatment. Masters thesis, Universiti Sains Malaysia.

[img]
Preview
PDF
Download (346kB) | Preview

Abstract

The present work investigated the microstructure, mechanical properties and corrosion behavior of cryorolled Al 1100 alloy in various pre-heat treatment. Before subjecting to cryorolling process, three different pre-heat treatment were selected; non pre-heat treatment, annealing (200˚C- 400˚C) and solution treatment (500˚C-580˚C). Pre-annealed sample at 250˚C and pre-solution treated sample at 540˚C showed the highest grain aspect ratio. Both of the samples also showed the smallest crystallite size (37.53 nm, 46.52 nm) and the highest lattice strain (9.50×103, 9.02×10-3). Pre-annealed cryorolled sample also resulted in higher hardness, ultimate tensile strength and yield strength with an improvement of 43.44%, 24.64% and 20.33% respectively. The improvement of hardness, tensile strength and yield strength were achieved for pre-solution treated cryorolled sample at 540˚C with increment of 16.93%, 1.20% and 5.6% respectively. The hardness and tensile strength after post annealed gradually decreased, but ductility increased for both samples. Cryorolled pre-treatment samples after post-annealed at 175˚C showed a high density of dislocations with formation of new sub-grains structure. Both of the pre-heat treatment cryorolled sample exhibited higher corrosion resistance with the lowest corrosion rate 0.0214mm/year and 0.0272mm/year and corrosion current 1.30μA and 2.14 μA, and more positive value of corrosion potential -0.7970V and -0.9774V for pre-annealed cryorolled and pre-solution treated sample respectively. Overall, the pre-annealed at 250˚C cryorolled sample followed by post-annealed B1reatment at 175˚C has shown the best value (mechanical and corrosion behaviour) in general.

Item Type: Thesis (Masters)
Subjects: T Technology
T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Bahan & Sumber Mineral (School of Material & Mineral Resource Engineering) > Thesis
Depositing User: Mr Mohamed Yunus Mat Yusof
Date Deposited: 03 Jul 2020 04:04
Last Modified: 22 Oct 2020 03:03
URI: http://eprints.usm.my/id/eprint/46673

Actions (login required)

View Item View Item
Share