Effects Of Ce On The Thermal Deformation Behavior Of AZ80 Magnesium Alloy

Recently, rare earth magnesium alloy has drawn more and more attentions as a kind of high temperature resistant heat magnesium alloy. The rare earth element being added in the magnesium alloy not only could be efficiently refining grains, also can improve the mechanical properties of room and high temperature. As cast magnesium alloy direct plastic deformation, can shorten the processing process, high economic benefits.In this paper,the thermal deformation behavior of as cast rare earth magnesium alloy was studied, meanwhile the deformation mechanism was precisely analyzed, Which provides the basis for the development and utilization of rare earth magnesium alloy.In this paper, the microstructure of the alloy is analyzed firstly.obtaining that 0.4% AZ80+Ce alloy consists essentially of α-Mg matrix and island-like eutectic phase ?-Mg17Al12, in addition, the presence of needle or rod-shaped Al4 Ce phase, meanwhile grain is obviously refined.Then using thermal simulation experiment,Thermal simulation test the relationship between rheological stress σ, strain rate ε?, alloy threshold stress ?0, and deformation temperature T was discussed in the process of hot deformation by linear fitting method, meanwhile the hyperbolic sine function model of the alloy was established reasonably, and the effect of rare earth Cre on the thermal activation energy of AZ80 magnesium alloy was investigated.AZ80 and AZ80+Ce also show obvious dynamic recrystallization in the process of high temperature hot compression deformation. Experimental peak stress of AZ80 alloy gets improvement after adding rare-earth Ce. The thermal mechanical behavior of as-cast AZ80+Ce magnesium alloy was studied, AZ80+Ce magnesium alloy flow stress equation for Z parameter expression.Thermal activation energy Q = 176.682KJ/mol, and increasing 10% compared to AZ80. The corresponding threshold stress values of AZ80+Ce alloy were repectively 43.8MPa, 22.8MPa, 7.5 MPa, 2.1MPa at a temperature of 300℃,340℃,380℃,420℃. Relative AZ80 magnesium alloy has been improved.Finally, the processing map of as cast AZ80+Ce alloy was established and analyzed, and the reasonable process parameters of the hot working process of as cast alloy were determined. Alloy instability region mainly distributes in the high strain rate zone, After adding rare earth Ce, the crack in the hot deformation process is reduced, and the forming property of the alloy is improved. ? reaches a peak of 38%,improving relatively of AZ80.