Effects Of Ti Addition On Hot Deformation And Extrued Microstructure And Properties Of Al-Mn-Mg-RE Alloy

3XXX aluminum alloys have the virtue of good corrosion resistance, highductility, well electric and thermal conductivity,which are widely used in chemicalequipment、hardware for civil use and air-conditioning refrigeration part. But thecommerical alloys with the high content of manganese, such as3003aluminum, areeasily to segregate with the cool process during casting, which result in the reduce ofprocess ability and the limit of application.Therefore, the important point of thisarticle is to improve microstructure and processing property, accompanying withadding microcontent elements.In this work, the investigation of titanium (Ti) effection on hot compressivedeformation behavior of Al-Mn-Mg-RE alloys was studied by Gleeble-1500.Microstructure evolution of Al-Mn-Mg-RE added Ti element were studied by usingoptical microscopy (OM) and transmission electron microscopy(TEM). Meanwhile,the mictrostructure impacting on property of Al-Mn-Mg-RE and Al-Mn-Mg-RE-Tialloys were studied by X-ray diffraction (XRD), OM, scanning electron microscopy(SEM) and universal tensile testing machine. The results as fellows:(1) The hot deformation activation energy and material constant ofAl-Mn-Mg-RE added Ti and without Ti alloys were obitained by theZener-Hollomon parameter Z in the hyperbolic sine equation. The hot deformationactivation energy were202.0599kJ/mol and186.4817kJ/mol, respectively.Compared to Al-Mn-Mg-RE alloy, the stress exponent of Al-Mn-Mg-RE added Tilimit increased, accompanying decreasing of stess level parameter.(2) With Z value decreasing, the hot of compressive microstructure ofAl-Mn-Mg-RE added Ti and without Ti converted to dynamic recrystallization fromdynamic recovery; The sub-grain boundaries were very clear, smooth and stable; Thepattern and distribution of the precipitate was changed, and dislocation densitydecreased. Meanwhile, the grains were refined, and some novel tiny Ti2Al20RE phasewas found, which improve the property of Al-Mn-Mg-RE alloy added Ti.(3) According to the dynamic model, the process maps were drew forAl-Mn-Mg-RE added Ti and without Ti. Ti addition can improve the optimization ofhot process temperature. The optimization of hot process temperature were from450to470℃and from440to450℃, respectively, the reasonable strainration is0.01s-1. (4) After Ti addition, the grain size of Al-Mn-Mg-RE alloy was obviouslyrefined, and the second phase particle were improved.The results was that the tensilestrength, yield strength and percentage of elongtation were all enhanced.