Abstract
A comprehensive study of the annealing behavior of some non heat-treatable commercial aluminium alloys has been carried out. The primary objective of this work has been to establish a detailed knowledge of the recovery and recrystallization processes occurring during annealing of heavily deformed metals, from both an experimental and a modeling point of view. The experimental part has focused on the evolution in stored energy and mechanical properties as well as the kinetics of recovery and recrystallization during annealing. The modeling part has dealt with the construction of a computer model based on physical metallurgical principles for describing the kinetic aspects of both recovery and recrystallization. The time dependency of recrystallization, described in terms of the JMAK-exponent (Johnson-Mehl-Avrami-Kolmogorov) has been followed for a range of annealing temperatures, strains and alloys. The results revealed for all these variants JMAK-exponents of about 2, which are much lower than the classical values of 3 and 4 for three dimensional homogenous site saturation and Johnson-Mehl- kinetics, respectively. A recrystallization model has been developed, which consists of the following main features: Nucleation sites are distributed approximately randomly in space; Nucleation of new grains is site saturated; The growth rate of the recrystallized grains decreases with
More>>
Citation Formats
Furu, T.
Modeling of recrystallization applied to commercial aluminium alloys.
Norway: N. p.,
1992.
Web.
Furu, T.
Modeling of recrystallization applied to commercial aluminium alloys.
Norway.
Furu, T.
1992.
"Modeling of recrystallization applied to commercial aluminium alloys."
Norway.
@misc{etde_10105854,
title = {Modeling of recrystallization applied to commercial aluminium alloys}
author = {Furu, T}
abstractNote = {A comprehensive study of the annealing behavior of some non heat-treatable commercial aluminium alloys has been carried out. The primary objective of this work has been to establish a detailed knowledge of the recovery and recrystallization processes occurring during annealing of heavily deformed metals, from both an experimental and a modeling point of view. The experimental part has focused on the evolution in stored energy and mechanical properties as well as the kinetics of recovery and recrystallization during annealing. The modeling part has dealt with the construction of a computer model based on physical metallurgical principles for describing the kinetic aspects of both recovery and recrystallization. The time dependency of recrystallization, described in terms of the JMAK-exponent (Johnson-Mehl-Avrami-Kolmogorov) has been followed for a range of annealing temperatures, strains and alloys. The results revealed for all these variants JMAK-exponents of about 2, which are much lower than the classical values of 3 and 4 for three dimensional homogenous site saturation and Johnson-Mehl- kinetics, respectively. A recrystallization model has been developed, which consists of the following main features: Nucleation sites are distributed approximately randomly in space; Nucleation of new grains is site saturated; The growth rate of the recrystallized grains decreases with time according to either the deformation zones associated with large undeformable particles or concurrent recovery simultaneous with the recrystallization process. The modeling results have shown that introducing a decreasing growth rate due to deformation zones decreases the JMAK-exponent to a value which corresponds to the experimental JMAK-values. 112 refs., 88 figs., 2 tabs.}
place = {Norway}
year = {1992}
month = {Sep}
}
title = {Modeling of recrystallization applied to commercial aluminium alloys}
author = {Furu, T}
abstractNote = {A comprehensive study of the annealing behavior of some non heat-treatable commercial aluminium alloys has been carried out. The primary objective of this work has been to establish a detailed knowledge of the recovery and recrystallization processes occurring during annealing of heavily deformed metals, from both an experimental and a modeling point of view. The experimental part has focused on the evolution in stored energy and mechanical properties as well as the kinetics of recovery and recrystallization during annealing. The modeling part has dealt with the construction of a computer model based on physical metallurgical principles for describing the kinetic aspects of both recovery and recrystallization. The time dependency of recrystallization, described in terms of the JMAK-exponent (Johnson-Mehl-Avrami-Kolmogorov) has been followed for a range of annealing temperatures, strains and alloys. The results revealed for all these variants JMAK-exponents of about 2, which are much lower than the classical values of 3 and 4 for three dimensional homogenous site saturation and Johnson-Mehl- kinetics, respectively. A recrystallization model has been developed, which consists of the following main features: Nucleation sites are distributed approximately randomly in space; Nucleation of new grains is site saturated; The growth rate of the recrystallized grains decreases with time according to either the deformation zones associated with large undeformable particles or concurrent recovery simultaneous with the recrystallization process. The modeling results have shown that introducing a decreasing growth rate due to deformation zones decreases the JMAK-exponent to a value which corresponds to the experimental JMAK-values. 112 refs., 88 figs., 2 tabs.}
place = {Norway}
year = {1992}
month = {Sep}
}