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/ http://umpir.ump.edu.my/id/eprint/2271/ http://umpir.ump.edu.my/id/eprint/2271/1/HEMALATHA__NADARAJAH.PDF

id	ump-2271
recordtype	eprints
spelling	ump-22712015-03-03T07:55:39Z 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. http://iportal.ump.edu.my/lib/item?id=chamo:30982&theme=UMP2
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
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/ http://umpir.ump.edu.my/id/eprint/2271/ http://umpir.ump.edu.my/id/eprint/2271/1/HEMALATHA__NADARAJAH.PDF
first_indexed	2023-09-18T21:55:55Z
last_indexed	2023-09-18T21:55:55Z
_version_	1777414077904060416

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

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