电磁搅拌连续铸挤Al5Ti1B合金的组织与晶粒细化效果.DOC

电磁搅拌Al-5Ti-1B的显微组织与细化王顺成1，郑开宏1，1，石 路2，宁长维3 （1 广东省工业技术研究院，广州 510650；2 东北大学材料与冶金学院，沈阳 110004；. 佛山市南海三湘铝业材料有限公司，）摘要：Al-5Ti-1B熔体施加电磁搅拌，然后连续铸挤Al-5Ti-1B丝，研究了Al-5Ti-1B的显微组织与晶粒细化，结果表明：TiB2粒子TiB2粒子Al-5Ti-1B的晶粒细化能力。Al-5Ti-1B的Ti、B元素含量分别为5.08％和1.02％，TiB2粒子平均尺寸为μm，TiAl3相平均尺寸为μm。添加0.2％的Al-5Ti-1Bmin，可使纯铝晶粒μm细化至μm，保温120 min，关键词：Al-5Ti-1B；电磁搅拌；连续铸挤 中图分类号：TG146.2+1 文献标识码：A electromagnetic stirring on microstructure and grain refining efficiency of Al-5Ti-1B grain refiner WANG Shun-cheng1, ZHENG Kai-hong1, QI Wen-jun1, SHI Lu2, NING Chang-wei3 (1. Institute of Metal Processing and Forming Technology, Guangdong General Research Institute of Industrial Technology(Guangzhou Research Institute of Nonferrous Metals), Guangzhou 510650, China; 2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China; 3. Foshan Nanhai Sanxiang Aluminium Industry Materials Co.,Ltd., Foshan 528225, China) Abstract: The Al-5Ti-1B grain refiner was prepared by continuous casting and extrusion process with electromagnetic stirring. The effect of electromagnetic stirring on microstructure and grain refining efficiency of Al-5Ti-1B grain refiner were investigated. Results show that the agglomerating and precipitating of TiB2 particles in Al-5Ti-1B melt can be prevented by electromagnetic stirring. The distribution of TiB2 particles in α-Al and grain refining efficiency of Al-5Ti-1B grain refiner can be improved by electromagnetic stirring. The content of Ti and B are 5.08% and 1.02%. The average size of TiB2 particles uniformly distributed in the α-Al is 0.74 μm. The average size of TiAl3 phase with square shape is 15.7 μm. The grain average size of pure aluminum with adding 0.2% Al-5Ti-1B grain refiner and holding 2 min are refined from 2800 μm to 68 μm. When the holding time is prolonged to 120 min, the grains coarsening are not occurring. Key words: grain refiner; Al-5Ti-1B; electromagnetic stirring; continuous casting and extrusion 0 前 言 晶粒细化可改善铝合金提高铝。目前铝加工最常用的晶粒细化剂Al-Ti-