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

Research output: Contribution to journalReview articlepeer-review

9 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 languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Materials Processing Technology
Volume202
Issue number1-3
DOIs
StatePublished - 20 Jun 2008

Keywords

  • Cross-channel extrusion
  • Fine-grained material
  • Mechanical properties

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