Research On Microstaictures And Properties Of Wrought Magnesium Alloy Containing Lanthanum Addition Of Lanthanum Oxide

This article conducted a study of adding rare earth La2O3to prepare wroughtmagnesium alloy containing La. By using the method of adding lanthanum oxide,AZ31wrought alloy containing La content between02.0wt.%was prepared. And themicrostructures and properties was compared with the alloy which prepared byMg La intermediate alloy. This study shows that AZ31wrought alloy containing Lacan be prepared by adding lanthanum oxide. In the same La content, itsmicrostructures and properties is similar to the alloy prepared by Mg La intermediatealloy.In the smelting process, lanthanum oxide was mixed with refining agent. Thenadd them into the magnesium solution, stirring while adding. It can not only protectthe melt, remove the slag, but also make the reaction between La2O3and magnesiumsolution thoroughly. According to the orthogonal experiment, it is found that theinfluence of mixing time on the recover rate of La is the most significant, followed theadditive amount of La2O3, melting temperature the least.The optimal solution wasdetermined: additive amount of80g, mixing time of60min, melting temperature of7102). For the alloy prepared by La2O3in the same La content, its grain size is similarto the one prepared by Mg La intermediate alloy. In the La content of0.95wt.%, theminimum grain size of alloy is10.3μm. The tensile strength of the alloy prepared byLa2O3is similar to the one which prepared by Mg La intermediate alloy. In the Lacontent of0.95wt.%, the maximum tensile strength is216MPa, increased by56%.The maximum reduction per rolling pass and maximum total reduction of the alloyprepared by La2O3is similar to the one which prepared by Mg La intermediate alloy.In the La content of0.95wt.%, alloy has the best rolling performance. The maximumreduction per rolling pass is41.1%, the maximum total reduction is81.9%.The ignition point of alloy is similar to the alloy prepared by Mg La intermediate alloy. In the La content of0.61wt.%, the maximum ignition point is571.82). At thesame time, under the temperature of4502), the oxide film is as compact as the alloyprepared by Mg La intermediate alloy. The antioxidant performance of these twoalloy is similar.By using La2O3powder, instead of Mg La intermediate alloy, high performancewrought alloy containing La can be prepared. This method not only omits thepreparation of Mg La intermediate alloy, but also save the cost. A new path for thedevelopment of rare earth wrought magnesium alloy was provided, it has animportant economic significance for industrial production.