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Simultaneously enhancing the tensile properties and intergranular corrosion resistance of Al–Mg–Si–Cu alloys by a thermo-mechanical treatment

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Identifiers
DOI: 10.1016/j.msea.2014.08.045
Keywords
  • Aluminum Alloy
  • Thermo-Mechanical Processing
  • Mechanical Properties
  • Intergranular Corrosion
  • Microstructure

Abstract

Abstract A novel thermo-mechanical treatment consisting of conventional pre-aging, cold-rolling and re-aging was developed to enhance the tensile properties and intergranular corrosion resistance of Al–Mg–Si–Cu alloys simultaneously. The thermo-mechanically treated 6061 Al sheets exhibit higher ultimate tensile strength and yield strength (being 466MPa and 451MPa) than those of the conventionally peak-aged alloys (being 365MPa and 347MPa), and meanwhile have no intergranular corrosion susceptibility and good elongation of 8.1%. Based on the microstructure evolution during the thermo-mechanical treatment, the factors that enhance the tensile properties and intergranular corrosion resistance of the treated sheets are discussed in detail.

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