Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 607, Issue -, Pages 313-317Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.04.009
Keywords
Aluminum alloys; Thermo-mechanical processing; Precipitation; Strengthening mechanism
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Funding
- National Natural Science Foundation of China [51301027]
- National Basic Research Program of China [2005CB623705]
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A novel thermo-mechanical treatment, composed of under-aging, cold-rolling and re-aging, has been developed to improve the strength and ductility of Al-Mg-Si-Cu alloys pronouncedly. The thermomechanically treated 6061 Al sheets exhibit much higher ultimate tensile strength and yield strength (being 560 MPa and 542 MPa, respectively) than those of the conventional peak-aged sheets (being 365 MPa and 348 MPa, respectively), while maintaining rather good elongation to failure and uniform elongation (being 8.5% and 7%, respectively). The microstructure analyses show that the high strength is attributed to a combination of precipitation strengthening, dislocation strengthening, sub-structure strengthening and high Taylor factor value and the good ductility is attributed to both the recovery process and the re-precipitation of the GP zones. Furthermore, the contributions of different strengthening mechanisms are quantitatively estimated. (C) 2014 Elsevier B.V. All rights reserved.
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