Low-frequency electromagnetic casting (LFEC) was introduced to semi-continuously cast three new high-alloyed Al-Zn-Mg-Cu-Zr alloys. Compared with conventional direct chilling casting (DC), the effects of low-frequency electromagnetic field on surface quality, as-cast microstructures, the contents of solute elements within grains and mechanical properties were investigated. The results show that microstructures of LFEC are fine, uniform, equiaxed, rosette-shaped, and the average sizes at the center of the ingots are 20-50 micrometer; the surface of the ingots of LFEC has no cold shut and less exudations. The contents of solute elements within grains and as-cast mechanical properties of LFEC are greatly increased: local relative concentration of Zn, Mg and Cu are 75-65, 72-66 and 45-40%, respectively. The as-cast ultimate tensile strength is 330-350 MPa and elongation is 0.8-1.2%. The ultimate tensile strength of the final products of two alloys is bigger than 760 MPa, and their elongation is bigger than 8%.
A new way to cast high-alloyed Al-Zn-Mg-Cu-Zr for super-high strength and toughness
Journal of Materials Processing Technology ; 171 , 3 ; 399-404
2006
6 Seiten, 6 Bilder, 2 Tabellen, 23 Quellen
Aufsatz (Zeitschrift)
Englisch
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