机构地区: 上海交通大学材料科学与工程学院金属基复合材料国家重点实验室
出 处: 《上海交通大学学报》 2007年第4期604-608,共5页
摘 要: 在连续高能超声作用下,制备出一种新型的Al-5Ti-lB中间合金,研究了该中间合金的微观组织、形核相TiB2粒子尺寸分布以及它对工业纯铝的晶粒细化效果.结果表明,与常规制备方法相比,在4min连续高能超声振动作用下,可使Al熔体对混合氟盐的吸收率达到100%,大大缩短了制备反应时间.Al-5Ti-1B中间合金中,TiAl3相呈现10-20μm小团块状;TiB2粒子为规则多边状,并有清晰的外形轮廓,呈松散聚集团状分布;TiB2粒子的平均尺寸以及尺寸跨度大大降低,分别为646.9nm、1.2μm.该中间合金的优良组织特性显著提高了其晶粒细化性能,用此中间合金可将工业纯铝的铸态晶粒尺寸细化至45μm. The microstructure, size distribution of TiB2 particles and grain refining performance of a new Al-5Ti-1B master alloy prepared under high-intensity ultrasound were investigated. The absorption ratio of the fluoride salt mixture for Al melts can reach 100% under continuously ultrasonic vibration for four minutes, which greatly shortens the preparation period of the Al-5Ti-1B master alloy. In the new Al-5Ti-1B master alloy, the block-like TiAl3 phase is 10-20 μm in size and the regularly polygonal TiB2 particles with clear profile loosely distribute in the aggregation. The mean size and size spread of the TiB2 particles are evidently reduced with 646.9 nm and 1.2 μm, respectively. The commercial purity aluminium can be refined to the limiting grain size of 45μm by the new Al-5Ti-1B master alloy.