亚共晶Al-Si合金的细化处理  

Refinement of Hypoeutectic Al Si Alloys

作　　者：王丽[1] 孙益民[1] 边秀房[1] 闫荣博 

机构地区：[1]山东工业大学

出　　处：《特种铸造及有色合金》1998年第5期18-20,共3页Special Casting & Nonferrous Alloys

摘　　要：比较了Ａｌ－３％Ｔｉ－３％Ｂ，Ａｌ－５％Ｔｉ－１％Ｂ中间合金对亚共晶Ａｌ－Ｓｉ合金的晶粒细化效果。结果表明，Ａｌ－３％Ｔｉ－３％Ｂ中间合金的细化作用明显优于Ａｌ－５％Ｔｉ－１％Ｂ。主要是Ａｌ－５％Ｔｉ－１％Ｂ中间合金加入熔体中，过量的Ｔｉ在ＴｉＢ２／熔体界面形成三元铝化物，通过包晶反应成为α－Ａｌ的异质晶核，但包晶反应温度的急剧下降是导致晶粒细化能力下降的直接原因；而Ａｌ－３％Ｔｉ－３％Ｂ中间合金加入熔体中，过量的Ｂ在ＴｉＢ２／熔体界面形成富Ｂ层，在冷却过程中，将发生共晶反应，生成大量的α－Ａｌ晶核，达到细化目的。A comparison of the refining effect between Al 3%Ti 3%B and Al 5%Ti 1%B master alloys for hypoeutectic Al Si alloys has been made. Experimental results indicated that Al 3%Ti 3%B master alloy has a stronger grain refining effect than Al 5%Ti 1%B master alloy. After addition of Al 5%Ti 1%B master alloy to Al Si alloy melts, excessive Ti on the Ti B 2/melt interface forms a ternary Al Ti Si compound which acts as heter geneous nudeifor α Al during peritectic reaction, But the decrease of peritectic temperature reduction grain refinement; When Al 3%Ti 3%B is added to aluminum melt, excessive B on the TiB 2/melt refines grain by homogeneous nuclei during eutectic rection.

关 键 词：亚共晶合金 晶粒细化 铝硅合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG292[金属学及工艺—金属材料]