skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Coarsening of AA6013-T6 Precipitates During Sheet Warm Forming Applications

Abstract

The use of warm forming for AA6xxx-T6 sheet is of interest to improve its formability; however, the effect warm forming may have on the coarsening of precipitates and the mechanical strength of these sheets has not been well studied. In this research, the coarsening behavior of AA6013-T6 precipitates has been explored, in the temperature range of 200-300 °C, and time of 30 s up to 50 h. Additionally, the effect of warm deformation on coarsening behavior was explored using: (1) simulated warm forming tests in a Gleeble thermo-mechanical simulator and (2) bi-axial warm deformation tests. Using a strong obstacle model to describe the yield strength (YS) evolution of the AA6013-T6 material, and a Lifshitz, Slyozov, and Wagner (LSW) particle coarsening law to describe the change in precipitate size with time, the coarsening kinetics were modeled for this alloy. The coarsening kinetics in the range of 220-300 °C followed a trend similar to that previously found for AA6111 for the 180-220 °C range. There was strong evidence that coarsening kinetics were not altered due to warm deformation above 220 °C. For warm forming between 200 and 220 °C, the YS of the AA6013-T6 material increased slightly, which could be attributed to strain hardening during warm deformation. Finally, amore » non-isothermal coarsening model was used to assess the potential reduction in the YS of AA6013-T6 for practical processing conditions related to auto-body manufacturing. The model calculations showed that 90% of the original AA6013-T6 YS could be maintained, for warm forming temperatures up to 280 °C, if the heating schedule used to get the part to the warm forming temperature was limited to 1 min.« less

Authors:
; ; ;  [1]
  1. University of Waterloo, Department of Mechanical and Mechatronics Engineering (Canada)
Publication Date:
OSTI Identifier:
22858056
Resource Type:
Journal Article
Journal Name:
Journal of Materials Engineering and Performance
Additional Journal Information:
Journal Volume: 27; Journal Issue: 3; Other Information: Copyright (c) 2018 ASM International; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1059-9495
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; COMPUTERIZED SIMULATION; DEFORMATION; HEATING; PRECIPITATION; PROCESSING; STRAIN HARDENING; YIELD STRENGTH

Citation Formats

Di Ciano, M., E-mail: mdiciano@uwaterloo.ca, DiCecco, S., Esmaeili, S., Wells, M. A., and Worswick, M. J. Coarsening of AA6013-T6 Precipitates During Sheet Warm Forming Applications. United States: N. p., 2018. Web. doi:10.1007/S11665-018-3161-9.
Di Ciano, M., E-mail: mdiciano@uwaterloo.ca, DiCecco, S., Esmaeili, S., Wells, M. A., & Worswick, M. J. Coarsening of AA6013-T6 Precipitates During Sheet Warm Forming Applications. United States. https://doi.org/10.1007/S11665-018-3161-9
Di Ciano, M., E-mail: mdiciano@uwaterloo.ca, DiCecco, S., Esmaeili, S., Wells, M. A., and Worswick, M. J. 2018. "Coarsening of AA6013-T6 Precipitates During Sheet Warm Forming Applications". United States. https://doi.org/10.1007/S11665-018-3161-9.
@article{osti_22858056,
title = {Coarsening of AA6013-T6 Precipitates During Sheet Warm Forming Applications},
author = {Di Ciano, M., E-mail: mdiciano@uwaterloo.ca and DiCecco, S. and Esmaeili, S. and Wells, M. A. and Worswick, M. J.},
abstractNote = {The use of warm forming for AA6xxx-T6 sheet is of interest to improve its formability; however, the effect warm forming may have on the coarsening of precipitates and the mechanical strength of these sheets has not been well studied. In this research, the coarsening behavior of AA6013-T6 precipitates has been explored, in the temperature range of 200-300 °C, and time of 30 s up to 50 h. Additionally, the effect of warm deformation on coarsening behavior was explored using: (1) simulated warm forming tests in a Gleeble thermo-mechanical simulator and (2) bi-axial warm deformation tests. Using a strong obstacle model to describe the yield strength (YS) evolution of the AA6013-T6 material, and a Lifshitz, Slyozov, and Wagner (LSW) particle coarsening law to describe the change in precipitate size with time, the coarsening kinetics were modeled for this alloy. The coarsening kinetics in the range of 220-300 °C followed a trend similar to that previously found for AA6111 for the 180-220 °C range. There was strong evidence that coarsening kinetics were not altered due to warm deformation above 220 °C. For warm forming between 200 and 220 °C, the YS of the AA6013-T6 material increased slightly, which could be attributed to strain hardening during warm deformation. Finally, a non-isothermal coarsening model was used to assess the potential reduction in the YS of AA6013-T6 for practical processing conditions related to auto-body manufacturing. The model calculations showed that 90% of the original AA6013-T6 YS could be maintained, for warm forming temperatures up to 280 °C, if the heating schedule used to get the part to the warm forming temperature was limited to 1 min.},
doi = {10.1007/S11665-018-3161-9},
url = {https://www.osti.gov/biblio/22858056}, journal = {Journal of Materials Engineering and Performance},
issn = {1059-9495},
number = 3,
volume = 27,
place = {United States},
year = {2018},
month = {3}
}