Effect of Ce on Solidification and Rolling Deformation of AZ31

　　Effect of Ce on Solidification and Rolling Deformation of AZ31
　　Magnesium alloys are widely used in automobile, electric and aerospace industries due to its combination of light-weight and high specific strength. At room-temperature, Magnesium alloy is hard to plastically deform because Magnesium crystal shows close-packed hexagonal structure. So it is necessary to research its influence factors of high-temperature deformation in order to enhance its plastic deformation capability.This article selects casting and rolling as study objects. Variant contents of Ce respectively are added into AZ31 to cast AZ31Ce serial alloys. This article studies effect of Ce on solidification and microstructure, deformation capacities of Alnico magnets as-cast AZ31, mechanics property and fracture behavior of rolled AZ31.The following are main studying content:Different content of Ce are added into AZ31 which are used to analyze effect of Ce on crystal growing in liquid AZ31;Using extremal rolling experiment to test max. total reduction and max. pass reduction of as-cast AZ31 so that we can tell which plastic deformation ability is best;Room-temperature tensile test is applied on rolled AZ31 to research influence of Ce on mechanics property and fracture behavior of rolled AZ31.After research above, I reach conclusions as fellow:As-cast AZ31 without Ce is composed ofα-Mg andβ-Mg17Al12. When Ce content is 0.2 percent,α-Mg dose not obviously change, while http://www.999magnet.com net-shapedβ-Mg17Al12 begins to break into massive. When Ce content rises to 0.6 percent,α-Mg crystal refines obviously andβ-Mg17Al12 totally appears as massive. In addition, little rod-shaped Al4Ce appears on crystal boundary. When Ce content reaches 0.8 percent,α-Mg further refines,β-Mg17Al12 also refines and decreases, more and bigger Al4Ce appears.Big degree of undercooling caused by solute segregation at interface of solid