(山东工业大学材料学院， 济南 250061)
摘要: 首次提出了熔融AlTiB细化纯Al新工艺，并与固态加入工艺进行了对比试验， 结果表明：熔融态加入工艺具有接触时间短、细化效果更好的优点，当AlTiB中 间合 金以固态形式加入时，TiB2粒子易聚集成团，其形核率很低；以稀释的熔融态形式加入时，TiB2呈弥散分布，并显著提高了TiB2粒子的形核率。)
摘 要: 首次提出了熔融AlTiB细化纯Al新工艺，并与固态加入工艺进行了对比试验， 结果表明：熔融态加入工艺具有接触时间短、细化效果更好的优点，当AlTiB中 间合 金以固态形式加入时，TiB2粒子易聚集成团，其形核率很低；以稀释的熔融态形式加入时，TiB2呈弥散分布，并显著提高了TiB2粒子的形核率。
关键字: 细化工艺 形核机理 TiB2粒子
（College of Materials Science and Engineering,
Shandong University of Technology, Jinan 250061）
Abstract:A new grain refining technique has been firstly put forward for commercial pure Al by adding molten AlTiB master alloys. Compared with traditional technique, this method has the advantages of shorter contact time and better refining effect, and the heredity effect of refining efficiency for AlTiB master alloys is greatly reduced. Nucleating sites for α-Al grains have been analysed after addition of AlTiB master alloy to pure aluminium. When AlTiB master alloy is added in the state of solid, both TiAl3 particles and TiB2 particles can act as neclei of α-Al. But most of TiB2 particles appear in form of large boride agglomerate, and the nucleating rate of TiB2 particles is greatly reduced. On the other hand, when AlTiB master alloy is added to pure Al in molten state and diluted, the array of TiB2 particles is seperated, and the nucleating rate of TiB2 particles is greatly increased.
Key words: refining technique nucleating mechanism TiB2 particle
