(1. 东北大学 材料与冶金学院，沈阳 110819；2. 中国科学院 金属研究所，沈阳 110016)
摘 要: 研究合金中B含量对铸态Ti3Al合金的组织和室温拉伸性能的影响。结果表明：B的添加明显细化了Ti3Al合金晶粒的尺寸，且在晶界处析出连续条状硼化物脆化相；使得铸态Ti3Al合金的室温强度和伸长率降低。
关键字: 铸态Ti3Al合金；B；细化晶粒；显微组织；室温拉伸性能
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The influences of B content on the microstructure and tensile properties of cast Ti3Al alloy at room temperature were investigated. The results show that the addition of B can significantly refine the crystal particles of cast Ti3Al alloy, and the consequent strip boride precipitates are found on the grain boundaries. However, the addition of B reduces the room-temperature strength and elongation of Ti3Al alloy.
Key words: cast Ti3Al alloy; element B; grain refining; microstructure; room-temperature tensile property
