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A study of various heating effects on the microstructure and mechanical properties of AA6082 using EBSD and CPFE

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Title: A study of various heating effects on the microstructure and mechanical properties of AA6082 using EBSD and CPFE
Authors: Shao, Z
Lee, J
Wang, J
Lin, J
Jiang, J
Item Type: Journal Article
Abstract: The solution heat treatment (SHT) process resolving hardening precipitates in high strength aluminium alloys is a critical step for high-efficient forming processes, such as Hot Form Quench (HFQ®). SHT largely determines the overall cycle time of a forming process. However, effects of heating process parameters, such as the heating rate and soaking time, on the microstructure and the associated mechanical properties of aluminium alloy 6082, one of the most commonly used aluminium alloys, for HFQ applications have not been systematically investigated. The aim of this study is to explore and understand the relationships among heat treatment conditions, grain microstructure and associated mechanical properties for AA6082. A series of uniaxial tensile tests conducted under various SHT conditions revealed significant variation on mechanical behaviour characterised by stress-strain curves. To correlate these stress-strain relationship with underlying microstructure, the grain and orientation distribution of each heat-treated sample were characterised by the electron backscatter diffraction (EBSD) technique. Due to the presence of a large number of microscopic variables, such as grain size, morphology, texture, grain boundary and etc., the crystal plasticity finite element (CPFE) modelling was employed to identify the key microscopic factors which determine the differences in the observed strength and ductility for all samples. A new CPFE model integrated with local strain criterion was proposed and validated to correlate the ductility and the strength with the material microstructure. This rigorous investigation provides more insights on how microstructure (grain size and texture) affects the mechanical behaviour for AA6082, which enables to enlarge the capability of HFQ for industrial applications.
Issue Date: 25-Mar-2020
Date of Acceptance: 4-Nov-2019
URI: http://hdl.handle.net/10044/1/74857
DOI: 10.1016/j.jallcom.2019.152921
ISSN: 0925-8388
Publisher: Elsevier BV
Start Page: 1
End Page: 13
Journal / Book Title: Journal of Alloys and Compounds
Volume: 5 nov 2019
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Innovate UK
Engineering & Physical Science Research Council (E
Funder's Grant Number: 102777
EP/R001715/1 / PO 2105860
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Solution heat treatment
Microstructure evolution
Aluminium alloy 6082
Crystal plasticity finite element
0204 Condensed Matter Physics
0912 Materials Engineering
0914 Resources Engineering and Extractive Metallurgy
Publication Status: Published online
Article Number: 152921
Online Publication Date: 2019-11-05
Appears in Collections:Mechanical Engineering
Faculty of Engineering