Quench sensitivity of Al-Mg-Si alloys: a model for linear cooling and strengthening
Quench sensitivity of Al-Mg-Si alloys: a model for linear cooling and strengthening
In this work quench-induced precipitation during continuous cooling of five Al-Mg-Si alloys is studied over a wide range of cooling rates of 0.05 K/min - 2x10^4 K/min using Differential Scanning Calorimetry (DSC), X-ray diffraction, optical microscopy (OM), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and hardness testing. The DSC data shows that the cooling reactions are dominated by a high temperature reaction (typically 500 °C down to 380 °C) and a lower temperature reaction (380 °C down to 250 °C), and the microstructural analysis shows they are Mg2Si phase formation and B’ phase precipitation on dispersoids, respectively. A new, physically-based model is designed to model the precipitation during the quenching as well as the strength after cooling and after subsequent age hardening. After fitting of parameters, the highly efficient model allows to predict accurately the measured quench sensitivity, the volume fractions of quench induced precipitates, enthalpy changes in the quenched sample and hardness values
light alloys, 6xxx alloys, 6061 alloy, 6083 alloy, heat treatment, strength, precipitation, cooling, quenching, reaction, diffusion, nucleation
117-129
Milkereit, B.
2b55bc26-041b-4e10-bd14-cc7b4519e72e
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
2015
Milkereit, B.
2b55bc26-041b-4e10-bd14-cc7b4519e72e
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Milkereit, B. and Starink, M.J.
(2015)
Quench sensitivity of Al-Mg-Si alloys: a model for linear cooling and strengthening.
Materials & Design, 76, .
(doi:10.1016/j.matdes.2015.03.055).
Abstract
In this work quench-induced precipitation during continuous cooling of five Al-Mg-Si alloys is studied over a wide range of cooling rates of 0.05 K/min - 2x10^4 K/min using Differential Scanning Calorimetry (DSC), X-ray diffraction, optical microscopy (OM), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and hardness testing. The DSC data shows that the cooling reactions are dominated by a high temperature reaction (typically 500 °C down to 380 °C) and a lower temperature reaction (380 °C down to 250 °C), and the microstructural analysis shows they are Mg2Si phase formation and B’ phase precipitation on dispersoids, respectively. A new, physically-based model is designed to model the precipitation during the quenching as well as the strength after cooling and after subsequent age hardening. After fitting of parameters, the highly efficient model allows to predict accurately the measured quench sensitivity, the volume fractions of quench induced precipitates, enthalpy changes in the quenched sample and hardness values
Text
Milkereit & Starink Mater&Design 2015 i.pdf
- Author's Original
More information
Submitted date: February 2015
Published date: 2015
Additional Information:
Available during April 2015 at http://www.sciencedirect.com/science/article/pii/S0261306915001521
Keywords:
light alloys, 6xxx alloys, 6061 alloy, 6083 alloy, heat treatment, strength, precipitation, cooling, quenching, reaction, diffusion, nucleation
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 374574
URI: http://eprints.soton.ac.uk/id/eprint/374574
ISSN: 0261-3069
PURE UUID: ef11433e-9221-43f3-9429-b8a3fe5e64f6
Catalogue record
Date deposited: 23 Feb 2015 09:14
Last modified: 14 Mar 2024 19:09
Export record
Altmetrics
Contributors
Author:
B. Milkereit
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics