（
(山東工業(yè)大學(xué)材料學(xué)院， 濟(jì)南 250061)
摘要: 首次提出了熔融AlTiB細(xì)化純Al新工藝，并與固態(tài)加入工藝進(jìn)行了對(duì)比試驗(yàn)， 結(jié)果表明：熔融態(tài)加入工藝具有接觸時(shí)間短、細(xì)化效果更好的優(yōu)點(diǎn)，當(dāng)AlTiB中 間合 金以固態(tài)形式加入時(shí)，TiB2粒子易聚集成團(tuán)，其形核率很低；以稀釋的熔融態(tài)形式加入時(shí)，TiB2呈彌散分布，并顯著提高了TiB2粒子的形核率。)
摘 要: 首次提出了熔融AlTiB細(xì)化純Al新工藝，并與固態(tài)加入工藝進(jìn)行了對(duì)比試驗(yàn)， 結(jié)果表明：熔融態(tài)加入工藝具有接觸時(shí)間短、細(xì)化效果更好的優(yōu)點(diǎn)，當(dāng)AlTiB中 間合 金以固態(tài)形式加入時(shí)，TiB2粒子易聚集成團(tuán)，其形核率很低；以稀釋的熔融態(tài)形式加入時(shí)，TiB2呈彌散分布，并顯著提高了TiB2粒子的形核率。
關(guān)鍵字: 細(xì)化工藝 形核機(jī)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
