Microstructure and Mechanical Properties of as Cast Al-6.5Mg-1.5Zn-0.5Fe Alloy Followed by Cold Rolling and Subsequent Annealing

Microstructures and mechanical properties of as-cast Al-6.5Mg-1.5Zn-0.5Fe alloys newly alloy-designed for the parts of automobile were investigated in detail. The aluminum (Al) sheets of 4 mm thickness, 30 mm width and 100 mm length were reduced to a thickness of 1mm by multi-pass rolling at ambient...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2019-01, Vol.64 (3), p.875-878
Main Author: Lee, Seong-Hee
Format: Article
Language:English
Subjects:
Alloys
aluminum alloy
Aluminum base alloys
Ambient temperature
Annealing
Cold rolling
Deformation
Elongation
Grain boundaries
High temperature
Mechanical properties
Microstructure
Recrystallization
Tensile strength
Thickness
Weight reduction
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Summary:Microstructures and mechanical properties of as-cast Al-6.5Mg-1.5Zn-0.5Fe alloys newly alloy-designed for the parts of automobile were investigated in detail. The aluminum (Al) sheets of 4 mm thickness, 30 mm width and 100 mm length were reduced to a thickness of 1mm by multi-pass rolling at ambient temperature and subsequently annealed for 1h at 200~500°C. The as-cast Al sheet was deformed without a formation of so large cracks even at huge rolling reduction of 75%. The recrystallization begun to occur at 250°C, it finished at 350°C. The as-rolled material showed tensile strength of 430 MPa and tensile elongation of 4.7%, however the specimen after annealing at 500°C showed the strength of 305 MPa and the elongation of 32%. The fraction of high angle grain boundaries above 15 degree increased greatly after annealing at high temperatures. These characteristics of the specimens after annealing were discussed in detail.
ISSN:2300-1909
1733-3490
2300-1909
DOI:10.24425/amm.2019.129464