Refinement of Hypoeutectic Al  Si Alloys

Wang Li  Sun Yimin  Bian Xiufang  Yan Rongbo

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Refinement of Hypoeutectic Al Si Alloys
Issue 5, (1998)
Published： 1998 ，
DOI：

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[1]王丽,孙益民,边秀房,闫荣博.亚共晶Al-Si合金的细化处理[J].特种铸造及有色合金,1998(05):20-22.

Wang Li Sun Yimin Bian Xiufang Yan Rongbo. Refinement of Hypoeutectic Al Si Alloys. [J]. Special Casting & Nonferrous Alloys (5).(1998)
[1]王丽,孙益民,边秀房,闫荣博.亚共晶Al-Si合金的细化处理[J].特种铸造及有色合金,1998(05):20-22. DOI：

Wang Li Sun Yimin Bian Xiufang Yan Rongbo. Refinement of Hypoeutectic Al Si Alloys. [J]. Special Casting & Nonferrous Alloys (5).(1998) DOI：

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。

Abstract

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.