Abstract
This paper addresses the effects of Ce-rich mischmetal on the microstructure evolution of a 5182 aluminum alloy during annealing and rolling processes. The Ce-rich mischmetal was added to an as-cast 5182 aluminum alloy in an induction furnace, and this was followed by homogenized annealing at 450 °C for 24 h and a rolling operation. The microstructure evolution and mechanical properties’ analysis of the 5182 Al alloy were characterized. The results show that the Ce-rich mischmetal could modify the microstructure, refine the α-Al grains, break the network distribution of Mg2Si phases, and prevent Cr and Si atoms from diffusing into the Al6(Mn, Fe) phase in the as-cast 5182 Al alloys. Ce-rich mischmetal elements were also found to refine the Al6(Mn, Fe) phase after cold rolling. Then, the refined Al6(Mn, Fe) particles inhibited the growth of recrystallization grains to refine them from 10.01 to 7.18 μm after cold rolling. Consequently, the tensile strength of the cold-rolled 5182 Al alloy increased from 414.65 to 454.34 MPa through cell-size strengthening, dislocation density strengthening, and particle strengthening. The tensile strength of the recrystallization annealed 5182 Al alloy was increased from 322.16 to 342.73 MPa through grain refinement strengthening, and this alloy was more stable after the recrystallization annealing temperature.
Highlights
5182 aluminum alloys have been commonly used to fabricate car bodies and complex shaped parts on vehicles for the automotive industry due to their high strength-to-weight ratio, light weight, weldability, and corrosion resistance properties [1]
Medvedev et al [16] studied the effect of La on the microstructure and mechanical properties of the 6xxx series type aluminum alloy and found that lanthanum inhibited the formation of the AlFeSi phase and reduced the grain size in as-cast alloys
Al alloy were higher than the 5182-0Ce Al alloy
Summary
5182 aluminum alloys have been commonly used to fabricate car bodies and complex shaped parts on vehicles for the automotive industry due to their high strength-to-weight ratio, light weight, weldability, and corrosion resistance properties [1]. Al6 (Mn, Fe) precipitates could be remarkably refined by adding Ce. Medvedev et al [16] studied the effect of La on the microstructure and mechanical properties of the 6xxx series type aluminum alloy and found that lanthanum inhibited the formation of the AlFeSi phase and reduced the grain size in as-cast alloys. Previous studies of our group have shown that Ce-rich mischmetal can refine as-cast 5182 Al alloy grains and improve their secondary phase morphology [17,18]. The effect of Ce-rich mischmetal on the microstructure evolution of the as-cast, homogenized annealed and cold-rolled 5182 Al alloys were characterized, and their mechanical properties after the recrystallization and cold rolling process were systemically investigated
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