Effects of heat treatments on AA6061 aluminum alloy deformed by cross-channel extrusion

Cheng Yu Chou; Che Wei Hsu; Sheng Long Lee; Kuan Wen Wang; Jing Chie Lin

doi:10.1016/j.jmatprotec.2007.11.115

Effects of heat treatments on AA6061 aluminum alloy deformed by cross-channel extrusion

Cheng Yu Chou, Che Wei Hsu, Sheng Long Lee, Kuan Wen Wang, Jing Chie Lin

Graduate Institute of Materials Science and Engineering

Research output: Contribution to journal › Review article › peer-review

10 Scopus citations

Abstract

In this study, the relationship between microstructures and mechanical properties of the cross-channel extrusion (CCE) processed AA6061 alloy caused by different heat treatments were investigated. The ultimate tensile strength of the homogenized AA6061 can be strengthening to 194 MPa after extruded at 448 K for 8 passes. After T6 treatment, the strength was increased from 194 to 323 MPa caused by the formation of fine precipitates; however, the grains were coarsened. The Post-CCE aging treatment was applied on AA6061 alloy that the alloy was processed in supersaturated state at 448 K for 8 passes, and then artificial aged. A higher tensile strength of 364 MPa which is 13% higher when compared with the T6 treated sample was obtained since it consisted of fine-grained matrix with grain structure size of 0.2-0.5 μm and precipitation hardening effect. It demonstrates that the Post-CCE aging treatment is a suitable method for producing a heat treatable Al alloy with improved strength when applied to CCE process.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Journal of Materials Processing Technology
Volume	202
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jmatprotec.2007.11.115
State	Published - 20 Jun 2008

Keywords

Cross-channel extrusion
Fine-grained material
Mechanical properties

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10.1016/j.jmatprotec.2007.11.115

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title = "Effects of heat treatments on AA6061 aluminum alloy deformed by cross-channel extrusion",

abstract = "In this study, the relationship between microstructures and mechanical properties of the cross-channel extrusion (CCE) processed AA6061 alloy caused by different heat treatments were investigated. The ultimate tensile strength of the homogenized AA6061 can be strengthening to 194 MPa after extruded at 448 K for 8 passes. After T6 treatment, the strength was increased from 194 to 323 MPa caused by the formation of fine precipitates; however, the grains were coarsened. The Post-CCE aging treatment was applied on AA6061 alloy that the alloy was processed in supersaturated state at 448 K for 8 passes, and then artificial aged. A higher tensile strength of 364 MPa which is 13% higher when compared with the T6 treated sample was obtained since it consisted of fine-grained matrix with grain structure size of 0.2-0.5 μm and precipitation hardening effect. It demonstrates that the Post-CCE aging treatment is a suitable method for producing a heat treatable Al alloy with improved strength when applied to CCE process.",

keywords = "Cross-channel extrusion, Fine-grained material, Mechanical properties",

author = "Chou, {Cheng Yu} and Hsu, {Che Wei} and Lee, {Sheng Long} and Wang, {Kuan Wen} and Lin, {Jing Chie}",

note = "Funding Information: The authors would like to thank the National Science Council of Taiwan under contract NSC95-2622-E-008-002-CC3 for financial support of this research and Mr. Che-Wei Hsu, Mr. Wei-Long Pang, and Mr. Ching-Miow Hsu for fruitful discussions.",

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AU - Chou, Cheng Yu

AU - Hsu, Che Wei

AU - Lee, Sheng Long

AU - Wang, Kuan Wen

AU - Lin, Jing Chie

N1 - Funding Information: The authors would like to thank the National Science Council of Taiwan under contract NSC95-2622-E-008-002-CC3 for financial support of this research and Mr. Che-Wei Hsu, Mr. Wei-Long Pang, and Mr. Ching-Miow Hsu for fruitful discussions.

PY - 2008/6/20

Y1 - 2008/6/20

N2 - In this study, the relationship between microstructures and mechanical properties of the cross-channel extrusion (CCE) processed AA6061 alloy caused by different heat treatments were investigated. The ultimate tensile strength of the homogenized AA6061 can be strengthening to 194 MPa after extruded at 448 K for 8 passes. After T6 treatment, the strength was increased from 194 to 323 MPa caused by the formation of fine precipitates; however, the grains were coarsened. The Post-CCE aging treatment was applied on AA6061 alloy that the alloy was processed in supersaturated state at 448 K for 8 passes, and then artificial aged. A higher tensile strength of 364 MPa which is 13% higher when compared with the T6 treated sample was obtained since it consisted of fine-grained matrix with grain structure size of 0.2-0.5 μm and precipitation hardening effect. It demonstrates that the Post-CCE aging treatment is a suitable method for producing a heat treatable Al alloy with improved strength when applied to CCE process.

AB - In this study, the relationship between microstructures and mechanical properties of the cross-channel extrusion (CCE) processed AA6061 alloy caused by different heat treatments were investigated. The ultimate tensile strength of the homogenized AA6061 can be strengthening to 194 MPa after extruded at 448 K for 8 passes. After T6 treatment, the strength was increased from 194 to 323 MPa caused by the formation of fine precipitates; however, the grains were coarsened. The Post-CCE aging treatment was applied on AA6061 alloy that the alloy was processed in supersaturated state at 448 K for 8 passes, and then artificial aged. A higher tensile strength of 364 MPa which is 13% higher when compared with the T6 treated sample was obtained since it consisted of fine-grained matrix with grain structure size of 0.2-0.5 μm and precipitation hardening effect. It demonstrates that the Post-CCE aging treatment is a suitable method for producing a heat treatable Al alloy with improved strength when applied to CCE process.

KW - Cross-channel extrusion

KW - Fine-grained material

KW - Mechanical properties

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Effects of heat treatments on AA6061 aluminum alloy deformed by cross-channel extrusion

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