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Precipitation hardening behaviour of AA6111 Esmaeili, Shahrzad
Abstract
The precipitation hardening behaviour of AA6111 was investigated by: (a) a comprehensive experimental study on the relationship between thermal processing and the evolution of microstructure and properties of the alloy, and (b) integrating the acquired knowledge with the established physical theories and models to develop a new process model to predict the yield strength of the alloy during artificial aging. Two thermal processing histories were examined: (a) artificial aging of the solution treated materials and (b) artificial aging of the materials with variable levels of natural aging. The kinetics of precipitation for the solution treated material was determined using isothermal calorimetry in the temperature range of 160- 220°C. A new simple analytical procedure was also introduced to obtain the kinetics of precipitation through a set of differential scanning calorimetry experiments. A new model was proposed to describe the kinetics of concurrent precipitation and dissolution of natural aging zones during artificial aging of the naturally aged materials. The kinetics for the formation of natural aging zones was also modeled. A new process model was developed to predict the yield strength of the alloy during the entire aging process. The validity of the model was verified by the excellent agreement between the predictions of the model and independent experimental results.
Item Metadata
Title |
Precipitation hardening behaviour of AA6111
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2002
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Description |
The precipitation hardening behaviour of AA6111 was investigated by: (a) a
comprehensive experimental study on the relationship between thermal processing and the
evolution of microstructure and properties of the alloy, and (b) integrating the acquired
knowledge with the established physical theories and models to develop a new process model to
predict the yield strength of the alloy during artificial aging. Two thermal processing histories
were examined: (a) artificial aging of the solution treated materials and (b) artificial aging of the
materials with variable levels of natural aging. The kinetics of precipitation for the solution
treated material was determined using isothermal calorimetry in the temperature range of 160-
220°C. A new simple analytical procedure was also introduced to obtain the kinetics of
precipitation through a set of differential scanning calorimetry experiments. A new model was
proposed to describe the kinetics of concurrent precipitation and dissolution of natural aging
zones during artificial aging of the naturally aged materials. The kinetics for the formation of
natural aging zones was also modeled. A new process model was developed to predict the yield
strength of the alloy during the entire aging process. The validity of the model was verified by
the excellent agreement between the predictions of the model and independent experimental
results.
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Extent |
8806762 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-09-22
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0078783
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2002-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.