Microstructure and Mechanical Properties of As-cast 5182 Aluminum alloy Modified with Al-RE and Al-5Ti-1B Master Alloys

Abstract

Abstract. The modification effects of Al-RE (rare earth) and Al-5Ti-1B master alloys on the microstructure and mechanical properties of as-cast 5182 aluminum alloys were studied. Experimental results show that both of the modifications refine the Į-Al grains and the Mg 2 Si and (FeMn)Al 6 eutectics. The Mg 2 Al 3 phases exist in the forms of thin flake (ȕƍ-Mg 2 Al 3 ) and small granule (ȕ-Mg 2 Al 3 ) for the unmodified 5182 aluminum alloy. Modifications with 0.1 wt% Al-5Ti-1B and 0.2 wt% Al-RE yield longer flakes of ȕƍ-Mg 2 Al 3 and small amounts of ȕ-Mg 2 Al 3 granules. The other contents of the modifiers reduce the longer flakes of ȕƍ-Mg 2 Al 3 but facilitate formation of the particles and islands of ȕ-Mg 2 Al 3 . The 0.2 wt% of Al-RE modification yields the finest microstructure and the largest ductility; the 0.2 wt% of Al-5Ti-1B modification has better microstructure and the highest tensile strength.

Effect of P-MIG and CMT on microstructure and properties of 6082-T6 joints

“…From Figure 13, it can be seen that Mg in the molten metal cooling at about 450°C will occur eutectic reaction: L→α (Al) +β (Mg 2 Al 3 ) [30–32]. The Al 3 Mg 2 content in CMT WZ >0.012% is much higher than that in P-MIG WZ, which is one of the most important dispersion phases and is also a beneficial precipitation phase in WZ [33]. As shown in Figure 14, marker 2 and marker 4 are mainly composed of Al and Mg elements by EDS analysis (as shown in Table 6), presumably the Al 3 Mg 2 phase, and it is found that Al 3 Mg 2 lies mainly at the grain boundaries.…”

Effects of Ce-Rich Mischmetal on Microstructure Evolution and Mechanical Properties of 5182 Aluminum Alloy

“…The addition of modifiers could reduce the grain size of or refine intermetallic compounds; among them, Ce not only affects the grain size but also affects the morphology and distribution of the second phase in the Al alloy [1,7]. 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]. However, to our best knowledge, the microstructure and properties evolution after the cold deformation process of the Ce-rich mischmetal-modified 5182 aluminum alloy has rarely been studied.…”