EFFECTS OF Er ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AS-CAST Al-Mg-Mn-Zn-Sc-Zr-(Ti) FILLER METALS
Yang Fu-Bao;;;
北京有色金属研究总院
Cite this article:
Yang Fu-Bao. EFFECTS OF Er ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AS-CAST Al-Mg-Mn-Zn-Sc-Zr-(Ti) FILLER METALS. Acta Metall Sin, 2008, 44(8): 911-916 .
Abstract The microstructure and mechanical properties of Al-Mg-Mn-Zn filler alloys microalloyed by Scandium (Sc), Zirconium (Zr) , Erbium (Er) and Titanium (Ti) were investigated with OM, SEM, SEM and tensile tests. On the basis of the effective grain refinement, the influences of Er element and coexistence of Er and Ti elements on grain boundary morphologies and phase distribution in grain boundaries, as well as their effects on the mechanical properties of experimental alloys, have been emphatically researched. The results indicate that, for the refined Al-Mg alloys by Sc+Zr, adding minor Er element can enhance the grain refinement of alloys, thus improve both the strength and ductility, and ultimately produce Al3Er phase discontinuously distributing in the grain boundaries. The combinational addition of Er and Ti elements can led to the precipitation of (Al,Mg)20Ti2Er intermetallic compound particles with 5~10μm in size and square shape, which distribute in grain boundaries and give some contribution to the improvements in both tensile strength(UTS) and yield strength(0.2YS), but lower the ductility. Coexisting of (Al,Mg)20Ti2Er and Al3Er phases breaks the grain boundary succession, consequently offsets the improvement on the ductility caused by Er grain-refining, and results in the transition of tensile fractographic patterns from the mixed-fracture (intergranular and transcrystalline fractures) to the intergranular fracture.
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