Effect of semi-solid forming temperature and heat treatment on mechanical properties and microstructure of Mg-Al-Zn Alloy (AZ91D) for automotive light application

Effect of semi-solid forming temperature and heat treatment on mechanical properties and microstructure of Mg-Al-Zn Alloy (AZ91D) for automotive light application

Magnesium alloy usage in manufacturing engineering components resulting in weight reduction and as a consequence, reduction in fuel and energy consumption. Magnesium has a relatively low density and roughly 30% lighter than aluminum. However, magnesium is considered to be difficult to deform because...

Full description

Saved in:
Bibliographic Details
Published in:Journal of Mechanical Engineering and Sciences Vol. 14; no. 4; pp. 7319 - 7327
Main Authors: M. Kamal, M.R., Bazilah, N.F., Idris, M.H., Salleh, M.S., W. Ali, W.F.F.
Format: Journal Article
Language:English
Published: Pekan Universiti Malaysia Pahang 01-12-2020
Universiti Malaysia Pahang Publishing
Subjects:
Aluminum base alloys
az91d
Deformation effects
Dynamic recrystallization
Energy consumption
forming temperature
Grain size
hardness
Hardness tests
Heat treating
Heat treatment
Ingot casting
Magnesium alloys
Magnesium base alloys
Manufacturing engineering
Mechanical properties
Microstructure
semi solid
Semisolids
tensile strength
Tensile stress
Weight reduction
Zinc
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Magnesium alloy usage in manufacturing engineering components resulting in weight reduction and as a consequence, reduction in fuel and energy consumption. Magnesium has a relatively low density and roughly 30% lighter than aluminum. However, magnesium is considered to be difficult to deform because of the HCP structure. In this present work, the effect of semi-solid forming temperature and heat treatment on mechanical properties of Mg-Al-Zn were investigated. Mg-Al-Zn ingot was machined into a billet and formed with three different temperatures and underwent T4 heat-treatment process. To determine the mechanical properties and microstructure of the magnesium alloy, tensile and hardness test were performed and the result indicates that the highest average maximum tensile stress was achieved at 209 MPa at 530ºC after forming with T4 heat treatment and highest hardness value was at  21.44 HRB at 560ºC. On the other hand, effect of the forming temperature gives impact to the evolution of the microstructure from large grain size (as-cast) to the smaller grains size (0.00797mm2) forming at 560°C. This relate to the extensive dynamic recrystallization (DRX) occurs during forming and Mg-Al-Zn was sensitive with heat either direct or indirect heating method.
ISSN:2289-4659
2231-8380
DOI:10.15282/jmes.14.4.2020.01.0575