熔融AlTiB细化纯Al新工艺及形核机理

来源期刊：中国有色金属在线1997年第2期

论文作者：刘相法 边秀房 周生存 黄保旭 马家骥

文章页码：107 - 112

关键词：细化工艺 形核机理 TiB₂粒子

Key words：refining technique nucleating mechanism TiB₂ particle

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。

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.