Effects of La and Ce Addition on the Modification of Al-Si Based Alloys

Elgallad, E. M.; Doty, H. W.; Alkahtani, Saleh A.; Samuel, F. H.

doi:10.1155/2016/5027243

Cited by 34 publications

(12 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The enrichment of Ce elements at the frontiers of the solid-liquid interface also decreased the diffusion rate of Mg and Si atoms from α-Al lattice to the liquid phase, thereby reducing the efficiency of solute redistribution [21]. Thus, the nucleation and growth of Mg 2 Si in the 5182 Al alloy was retarded, which caused the breakage of the Mg 2 Si network in the 5182-0.4Ce Al alloy (Figure 5a,b).…”

Section: Effect Of Ce-rich Mischmetal On Microstructure Evolutionmentioning

confidence: 99%

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

et al. 2019

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of Ce-rich Mischmetal On Microstructure Evolutionmentioning

confidence: 99%

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

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Sharma et al [16] prepared the Al-11Si-20Cu brazing alloy containing La 2 O 3 by the electromagnetic induction casting process and found that the addition of La 2 O 3 significantly improved the filler brazeability, microhardness, joint tensile shear strength, and elongation of the composites. Elgallad et al [17] found that adding rare earth elements, La or Ce, to the Al-Si alloy increased the melting temperature of the alloy and caused partial modification of the eutectic Si particles. Liu et al [18] added different contents of CeO 2 and Y 2 O 3 (2 vol% and 3 vol%) to Ti/Al 2 O 3 composites prepared by vacuum hot pressing sintering to restrain the interface reaction.…”

Section: Introductionmentioning

confidence: 99%

Effect of CeO2 Content on Microstructure and Properties of SiCp/Al-Si Composites Prepared by Powder Metallurgy

et al. 2021

View full text Add to dashboard Cite

The effect of CeO2 content on the microstructure and properties of SiCp/Al-Si composites prepared by powder metallurgy was studied, and the mechanism of CeO2 in composites was deeply analyzed. The results show that the addition of the appropriate amount of CeO2 can refine the Si particles and improve the tensile properties of the SiCp/Al-Si composites. As the CeO2 content increases from 0 to 0.4 vol%, the particle size of the Si phase shows a tendency to decrease first and then increase, while the tensile strength, yield strength, and elongation of the composites show a trend of first increasing and then decreasing. When the CeO2 content is 0.2 vol%, the refining effect of CeO2 and the tensile properties of composites are the best. The fracture mode of SiCp/Al-Si composites with a rare earth addition is a mixed fracture. There are three main mechanisms for CeO2 in SiCp/Al-Si composites. One is when CeO2 serves as the nucleation substrate of Si phase to refine Si particles. The second is when CeO2 reacts with the alloying elements in the aluminum matrix to form a new phase, CeCu2Si2, which can not only play a role of dispersion strengthening, but also improve the bonding strength between Al matrix and Si particles. The third is the pinning effect of CeO2 and CeCu2Si2 particles on grain boundaries or phase boundaries to refine aluminum grains.

show abstract

“…Al-Si casting alloys have been used for a variety of purposes in the automotive and aircraft industries, due to their low density, superior castability, corrosion resistance, high strength to weight ratio, ease of recycling, high efficiency, and high wear resistance [1]. It is well known that the morphology of eutectic Si greatly affects the mechanical properties of cast Al-Si alloys [2,3]. Coarse primary Si and long needle-like eutectic Si affect the machinability of Al-Si alloys.…”

Section: Introductionmentioning

confidence: 99%

Solidification Behavior and Microstructure of Al-7Si Alloys with Individual and Combined Additions of Sr and Yb

Dong

Yan

et al. 2019

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

The effects of individual and combined additions of Sr and Yb on the solidification behavior and microstructure of Al-7Si alloys were investigated using thermal analysis, optical microscopy, and scanning electron microscopy. The results showed that the nucleation temperature, minimum temperature, and growth temperature of eutectic solidification were lower than those of the unmodified alloys, and eutectic recalescence at 2°C in the Yb- and (Sr + Yb)-modified alloys was observed. The decrease in the nucleation temperature and an increase in recalescence obviously refined the eutectic Si morphology of the Sr-, Yb-, and (Sr + Yb)-modified alloys from a coarse plate-like structure to a fine fibrous structure. Moreover, the three-dimensional microstructure of eutectic Si in the (Sr + Yb)-modified alloy showed the finer fibrous structure, which was mainly attributed to formation of the Al2Si2Yb phase. The formation enthalpy of Al2Si2Yb was lower than that of Al-(Si)-Sr in the (Sr + Yb)-modified alloy, thus suppressing the formation of the Al2Si2Sr intermetallic compound. The more effective Sr together with Yb further improved the modification effect of eutectic silicon.

show abstract

Effects of La and Ce Addition on the Modification of Al-Si Based Alloys

Cited by 34 publications

References 21 publications

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

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

Effect of CeO2 Content on Microstructure and Properties of SiCp/Al-Si Composites Prepared by Powder Metallurgy

Solidification Behavior and Microstructure of Al-7Si Alloys with Individual and Combined Additions of Sr and Yb

Contact Info

Product

Resources

About