Journal
CRYSTALS
Volume 12, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/cryst12040530
Keywords
aluminum alloy; rotary swaging; microstructure; mechanical properties; electrical conductivity
Funding
- National Key Research and Development Program [2018YFB2001800]
- National Natural Science Foundation of China [51974083, 52171235, 51871184]
- Dalian High-level Talents Innovation Support Program [2021RD06]
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The microstructural evolution of precipitates in a 6xxx alloy during thermomechanical treatment was investigated. It was found that the interaction between accumulated dislocations and precipitates significantly improved the strength and electrical conductivity of the alloy.
Thermomechanical treatment consisting of heat treatment and deformation is an effective processing route for precipitation-hardened 6xxx alloy (Al-Mg-Si-Cu system), and precipitates and dislocations produced during the process can significantly change its mechanical and conductive performance. We therefore investigated the microstructural evolution of precipitates in a representative 6xxx alloy during thermomechanical treatment. When the precipitates encountered the accumulated dislocations, the precipitates were bent and broken into dispersed smaller particles. The strength of the alloy was significantly improved by the proliferation of dislocations and precipitates and desired electrical conductivity was obtained as well. Our results prove that peak aging plus cold rotary swaging is an efficient processing route for simultaneously improving the mechanical and conductive performance of 6xxx alloy.
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