Study On The Flux-purification Behavior Of The Mg-9Al-6Ti-3B₂O₃ Alloy And The Mg-6RE-3B₂O₃ Alloy

In order to develop the high-performance magnesium alloys,in this paper,the purifying behavior of the Mg-9A1-6Ti-3B2O3 alloy and the Mg-6RE-3B2O3 alloy were studied based on the method of flux-purification.First,analyzed the types of the inclusions and the distribution of the porosities and inclusions in the Mg-9Al-6Ti-3B2O3 alloy and the Mg-6RE-3B2O2 alloy.Then,obtained the optimal range of the parameters,such as the amount of the flux,the content of each element in the flux and the melting temperature for the Mg-9A1-6Ti-3B2O3 alloy and the Mg-6RE-3B2O3 alloy through analyzing the basic theory and the single-factor method.Finally,on the basis of the optimal range of the parameters,obtained the optimal scheme using the orthogonal test to purify the Mg-9A1-6Ti-3B2O3 alloy and the Mg-6RE-3B2O3 alloy.The optimal purifying scheme for the Mg-9Al-6Ti-3B2O3 alloy is adding 2.5%of the optimal flux which contains 37%of the MgCl2,28%of the KC1,5%of the NaCl,10%of the CaCl2,6%of the CaF2,4%of the Na3AlF6,7%of the CaCO3 and 3%of the Na=CO3 under 800℃.The optimal purifying scheme for the Mg-6RE-3B2O3 alloy is adding 4%of the optimal flux which contains 42%of the KCl,8%of the NaCl,14%of the CaCl2,6%of the CaF2,18%of the Na3AlF6,6%of the LaCl3,6%of the CeCl3 under 800℃.And validated the effect of the optimal purifying scheme for the Mg-9Al-6Ti-3B2O3 alloy and the Mg-6RE-3B2O3 alloy through test.The results of the test show that the optimal purifying scheme can reduce the content of the inclusions and the pores,granular cells and improve the comprehensive performance of the alloys.The effect of the purification is obvious which can provide the certain reference for the purification of the new types of the magnesium alloy.