TY - JOUR
T1 - An investigation of the effects of solution heat treatment on mechanical properties for AA 6xxx alloys: experimentation and modelling
AU - Garrett, Richard
AU - Lin, Jianguo
AU - Dean, Trevor
PY - 2005/8/1
Y1 - 2005/8/1
N2 - A series of thermal-mechanical tests have been designed and carried out on the aluminium alloy AA 6082 to investigate the effects of solution heat treatment (SHT) time on the mechanical properties for a range of deformation rates at the SHT temperature of 525 degrees C. Particularly the effects of SHT time on the flow stress, ductility and anisotropy of the material are investigated experimentally. Based on Pearl's growth rate equation and diffusion theory, a SHT completeness variable is introduced to model the microstructural evolution of the material during the SHT period. This SHT evolution variable is incorporated into a viscoplastic material model to simulate the material flow at different levels of SHT completeness. A new set of unified SHT viscoplastic constitutive equations is formulated and the constants within the equation set are determined from the experimental data of AA 6082, using an Evolutionary Programming (EP) based optimisation software package. Further experimental work has been carried out for different deformation and SHT conditions to validate the model predictions. (c) 2004 Elsevier Ltd. All rights reserved.
AB - A series of thermal-mechanical tests have been designed and carried out on the aluminium alloy AA 6082 to investigate the effects of solution heat treatment (SHT) time on the mechanical properties for a range of deformation rates at the SHT temperature of 525 degrees C. Particularly the effects of SHT time on the flow stress, ductility and anisotropy of the material are investigated experimentally. Based on Pearl's growth rate equation and diffusion theory, a SHT completeness variable is introduced to model the microstructural evolution of the material during the SHT period. This SHT evolution variable is incorporated into a viscoplastic material model to simulate the material flow at different levels of SHT completeness. A new set of unified SHT viscoplastic constitutive equations is formulated and the constants within the equation set are determined from the experimental data of AA 6082, using an Evolutionary Programming (EP) based optimisation software package. Further experimental work has been carried out for different deformation and SHT conditions to validate the model predictions. (c) 2004 Elsevier Ltd. All rights reserved.
KW - aluminium alloys
KW - solution heat treatment
KW - hot forming
KW - materials modelling
KW - viscoplastic SHT model
UR - http://www.scopus.com/inward/record.url?scp=17844410645&partnerID=8YFLogxK
U2 - 10.1016/j.ijplas.2004.11.002
DO - 10.1016/j.ijplas.2004.11.002
M3 - Article
VL - 21
SP - 1640
EP - 1657
JO - International Journal of Plasticity
JF - International Journal of Plasticity
IS - 8
ER -