Controlled annealing of sandwich-structured aluminum AA1050 for optimized combinations of strength and ductility

A. Godfrey, O.V. Mishin*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

1 Downloads (Pure)

Abstract

A heavily rolled AA1050 sample with a microstructurally continuous sandwich structure, characterized by distinct microstructural evolution in the center and subsurface layers, has been annealed at different temperatures for 2 h with the objective of establishing optimized combinations of strength and ductility. It is observed that a large reduction in the fraction of high angle boundaries taking place during recovery in the subsurface layers results in delayed onset of recrystallization compared to that in the center layer, where the change in the fraction of high angle boundaries during recovery is small. The different recrystallization rates in this sandwich structure facilitate control of the overall recrystallized fraction, and can therefore be advantageous in obtaining a desired combination of both strength and ductility. A good combination of moderate strength and intermediate ductility is obtained in the material annealed at 250 °C and 270 °C, where the area fractions of recrystallized microstructure in the center are 7% and 36%, respectively. By analyzing the dependence of mechanical strength on the microstructure it is found that the mechanical properties can be described by a simple composite model using a rule of mixtures.
Original languageEnglish
JournalMaterials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing
Volume735
Pages (from-to)228-235
ISSN0921-5093
DOIs
Publication statusPublished - 2018

Keywords

  • Electron microscopy
  • Hardness
  • Tensile properties
  • Aluminum alloys
  • Cold rolling
  • Annealing

Cite this

@article{e8812611c1ae4121941318d03cd65931,
title = "Controlled annealing of sandwich-structured aluminum AA1050 for optimized combinations of strength and ductility",
abstract = "A heavily rolled AA1050 sample with a microstructurally continuous sandwich structure, characterized by distinct microstructural evolution in the center and subsurface layers, has been annealed at different temperatures for 2 h with the objective of establishing optimized combinations of strength and ductility. It is observed that a large reduction in the fraction of high angle boundaries taking place during recovery in the subsurface layers results in delayed onset of recrystallization compared to that in the center layer, where the change in the fraction of high angle boundaries during recovery is small. The different recrystallization rates in this sandwich structure facilitate control of the overall recrystallized fraction, and can therefore be advantageous in obtaining a desired combination of both strength and ductility. A good combination of moderate strength and intermediate ductility is obtained in the material annealed at 250 °C and 270 °C, where the area fractions of recrystallized microstructure in the center are 7{\%} and 36{\%}, respectively. By analyzing the dependence of mechanical strength on the microstructure it is found that the mechanical properties can be described by a simple composite model using a rule of mixtures.",
keywords = "Electron microscopy, Hardness, Tensile properties, Aluminum alloys, Cold rolling, Annealing",
author = "A. Godfrey and O.V. Mishin",
year = "2018",
doi = "10.1016/j.msea.2018.07.065",
language = "English",
volume = "735",
pages = "228--235",
journal = "Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier",

}

TY - JOUR

T1 - Controlled annealing of sandwich-structured aluminum AA1050 for optimized combinations of strength and ductility

AU - Godfrey, A.

AU - Mishin, O.V.

PY - 2018

Y1 - 2018

N2 - A heavily rolled AA1050 sample with a microstructurally continuous sandwich structure, characterized by distinct microstructural evolution in the center and subsurface layers, has been annealed at different temperatures for 2 h with the objective of establishing optimized combinations of strength and ductility. It is observed that a large reduction in the fraction of high angle boundaries taking place during recovery in the subsurface layers results in delayed onset of recrystallization compared to that in the center layer, where the change in the fraction of high angle boundaries during recovery is small. The different recrystallization rates in this sandwich structure facilitate control of the overall recrystallized fraction, and can therefore be advantageous in obtaining a desired combination of both strength and ductility. A good combination of moderate strength and intermediate ductility is obtained in the material annealed at 250 °C and 270 °C, where the area fractions of recrystallized microstructure in the center are 7% and 36%, respectively. By analyzing the dependence of mechanical strength on the microstructure it is found that the mechanical properties can be described by a simple composite model using a rule of mixtures.

AB - A heavily rolled AA1050 sample with a microstructurally continuous sandwich structure, characterized by distinct microstructural evolution in the center and subsurface layers, has been annealed at different temperatures for 2 h with the objective of establishing optimized combinations of strength and ductility. It is observed that a large reduction in the fraction of high angle boundaries taking place during recovery in the subsurface layers results in delayed onset of recrystallization compared to that in the center layer, where the change in the fraction of high angle boundaries during recovery is small. The different recrystallization rates in this sandwich structure facilitate control of the overall recrystallized fraction, and can therefore be advantageous in obtaining a desired combination of both strength and ductility. A good combination of moderate strength and intermediate ductility is obtained in the material annealed at 250 °C and 270 °C, where the area fractions of recrystallized microstructure in the center are 7% and 36%, respectively. By analyzing the dependence of mechanical strength on the microstructure it is found that the mechanical properties can be described by a simple composite model using a rule of mixtures.

KW - Electron microscopy

KW - Hardness

KW - Tensile properties

KW - Aluminum alloys

KW - Cold rolling

KW - Annealing

U2 - 10.1016/j.msea.2018.07.065

DO - 10.1016/j.msea.2018.07.065

M3 - Journal article

VL - 735

SP - 228

EP - 235

JO - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

JF - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

ER -