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Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment

Aluminium- Magnesium (Al-Mg) alloys have very good formability properties and have been used extensively for interior structural components of automotive Body in White (BIW). The alloys in an annealed temper achieve their strength through work hardening mechanism during press forming process. The s...

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Main Author: Nadarajah, Hemalatha
Format: Undergraduates Project Papers
Language:English
Published: 2007
Subjects:
TA Engineering (General). Civil engineering (General)
Online Access:http://umpir.ump.edu.my/id/eprint/2271/1/HEMALATHA__NADARAJAH.PDF
http://umpir.ump.edu.my/id/eprint/2271/
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spelling my.ump.umpir.22712021-05-31T03:37:27Z http://umpir.ump.edu.my/id/eprint/2271/ Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment Nadarajah, Hemalatha TA Engineering (General). Civil engineering (General) Aluminium- Magnesium (Al-Mg) alloys have very good formability properties and have been used extensively for interior structural components of automotive Body in White (BIW). The alloys in an annealed temper achieve their strength through work hardening mechanism during press forming process. The strengthening mechanism is due to Mg atoms in solid solution exerting dislocation drag during low temperature plastic straining. However at elevated temperatures, high diffusivity of Mg atoms allows easy dislocations rearrangements which lead to reduction of mechanical strength. This phenomenon is called softening. Furthermore, accumulation of stored energy in the dislocations substructures due plastic straining during press forming process also serves as a large driving force for thermal recovery. These two factors contribute Al-Mg alloy sheet to be susceptible to softening during paint bake cycle. Al-Mg sheets for automotive Body in White (BIW) applications are normally supplied in an annealed condition known as "-0-" temper. The microstructure of an annealed sheet is characterized by equiaxed recrystallized grains. Average size of grains depends on actual rolling schedule and heat treatment stages on those particular sheets. This project investigates the effect of varying grain size on softening characteristics of pre-strained sheets after paint bake cycle. This is done by annealing Al-Mg H32 sheets in different temperatures to obtain different grain size. Smaller grain size would have more softening than larger grain size. 2007-11 Undergraduates Project Papers NonPeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/2271/1/HEMALATHA__NADARAJAH.PDF Nadarajah, Hemalatha (2007) Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment. Faculty of Mechanical Engineering, Universiti Malaysia Pahang.
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic TA Engineering (General). Civil engineering (General)
spellingShingle TA Engineering (General). Civil engineering (General)
Nadarajah, Hemalatha
Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment
description Aluminium- Magnesium (Al-Mg) alloys have very good formability properties and have been used extensively for interior structural components of automotive Body in White (BIW). The alloys in an annealed temper achieve their strength through work hardening mechanism during press forming process. The strengthening mechanism is due to Mg atoms in solid solution exerting dislocation drag during low temperature plastic straining. However at elevated temperatures, high diffusivity of Mg atoms allows easy dislocations rearrangements which lead to reduction of mechanical strength. This phenomenon is called softening. Furthermore, accumulation of stored energy in the dislocations substructures due plastic straining during press forming process also serves as a large driving force for thermal recovery. These two factors contribute Al-Mg alloy sheet to be susceptible to softening during paint bake cycle. Al-Mg sheets for automotive Body in White (BIW) applications are normally supplied in an annealed condition known as "-0-" temper. The microstructure of an annealed sheet is characterized by equiaxed recrystallized grains. Average size of grains depends on actual rolling schedule and heat treatment stages on those particular sheets. This project investigates the effect of varying grain size on softening characteristics of pre-strained sheets after paint bake cycle. This is done by annealing Al-Mg H32 sheets in different temperatures to obtain different grain size. Smaller grain size would have more softening than larger grain size.
format Undergraduates Project Papers
author Nadarajah, Hemalatha
author_facet Nadarajah, Hemalatha
author_sort Nadarajah, Hemalatha
title Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment
title_short Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment
title_full Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment
title_fullStr Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment
title_full_unstemmed Grain size effect on softening behaviour of Al-Mg alloy due to paint bake heat treatment
title_sort grain size effect on softening behaviour of al-mg alloy due to paint bake heat treatment
publishDate 2007
url http://umpir.ump.edu.my/id/eprint/2271/1/HEMALATHA__NADARAJAH.PDF
http://umpir.ump.edu.my/id/eprint/2271/
_version_ 1702170000748445696
score 13.211869

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