Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 826, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141967
Keywords
Creep forming; Cold-rolling; Dislocation; Precipitation; Al-Mg-Si alloy
Categories
Funding
- National Natural Science Foundation of China [U2032117, 51675538, 11872380]
- National Key R&D Program of China [2017YFB0306300]
- Natural Science Foundation of Hunan Province [2018JJ3655]
- science and technology innovation Program of Hunan Province [2020RC4001]
- Innovation fund of National commercial aircraft manufacturing engineering technology center [COMAC-SFGS-2019-4284]
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The thermal-mechanical route of pre-ageing and heavy cold-rolling has shown significant improvements in creep formability and comprehensive properties in Al-Mg-Si alloy. By controlling solutes precipitation and dislocation recovery, extraordinary creep ageing response in heavily cold-deformed alloy was achieved. This approach demonstrates the potential for enhancing creep age forming of Al alloy components with exceptional figures of merit.
A thermal-mechanical route proceeding by pre-ageing and heavy cold-rolling has been developed to significantly improve both the creep formability and comprehensive properties in an Al-Mg-Si alloy. The uniform creep deformation increases by 2-5 times and the strength enhances by 60-140 MPa without sacrificing ductility compared to the conventional treatment. The pre-ageing at 180 degrees C could tune the density, mobility and distribution of the dislocations generated during cold-rolling. A physical metallurgical picture of the pre-ageing-dependent creep ageing in the cold-worked Al-Mg-Si alloy is established based on complementary transmission electron microscopy, differential scanning calorimetry and X-ray diffraction. Concurrent solutes precipitation and dislocation recovery contribute to the exceptional creep ageing response in the heavily cold-deformed Al-Mg-Si alloy. The high density dislocations could substantially promote the creep deformation and improve the strength-ductility balance. The fragmentation of grains and the inhibition of continuous precipitation along the grain boundary lead to a superior resistance to inter-granular corrosion. Our results demonstrate the application potential of solutes precipitation control before large predeformation in creep age forming of Al alloy components with unusual figures of merit.
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