电磁搅拌连续铸挤Al-5Ti-1B合金晶粒细化剂的质量评价

Quality evaluation of Al-5Ti-1B grain refiner produced by continuous casting and extrusion process with electromagnetic stirring

摘要:

采用电磁搅拌连续铸挤技术生产Al-5Ti-1B合金晶粒细化剂，研究了Al-5Ti-1B合金的化学成分、显微组织和晶粒细化效果，并与美国KBA、荷兰KBM、英国LSM 公司生产的Al-5Ti-1B合金进行了比较，对电磁搅拌连续铸挤Al-5Ti-1B合金的质量进行了评价．结果表明：电磁搅拌连续铸挤Al-5Ti-1B合金中Ti和B元素含量分别为5．08，和1．02，．Fe ，Si及V杂质元素含量分别为0．11，，0．087，和0．011，；T iA l3相呈块状，平均尺寸为15．7μm ，而T iB2粒子呈颗粒状均匀分布于α-A l基体，平均尺寸为0．74μm ；添加0．2，的A l-5 T i-1B合金，可使纯铝晶粒平均尺寸从2800μm细化到68μm ．比较结果表明：电磁搅拌连续铸挤A l-5 T i-1B合金的元素含量更稳定、杂质元素含量更低，T iA l3相和T iB2粒子更细小均匀，对铝晶粒的细化能力更强．

Abstract:

The Al-5Ti-1B grain refiner was produced by continuous casting and extrusion process with elec-tromagnetic stirring .The chemical compositions ,microstructure and grain refining efficiency of Al-5Ti-1B grain refiner were studied and compared with that of Al-5Ti-1B grain refiner produced by KBA ,KBM and LSM .The quality of Al-5Ti-1B grain refiner produced by continuous casting and extrusion process with e-lectromagnetic stirring was evaluated .Results show that the content of alloying elements Ti and B are 5 .08， and 1 .02， ,respectively .T he content of impurity elements Fe ,Si and V are 0 .11， ,0 .087， and 0 .011， ,respectively .The average size of fine TiAl3 phase with square shape is 15 .7 μm .The average size of fine TiB2 particles uniformly distributed in the α-Al is 0 .74 μm .The grains average size of pure Al with adding 0 .2， Al-5Ti-1B grain refiner can be refined from 2800μm to 68μm .The compared results in-dicate that the Al-5Ti-1B grain refiner produced by continuous casting and extrusion process with electro-magnetic stirring have many advantages ,for examples ,the content of Ti and B is much more stable ,the content of impurity elements is lower ,the TiAl3 phases and TiB2 particles are finer and uniform and the grain refinement ability is stronger .