Zr-poisoning of grain refiner particles studied in Al-Ni-Zr amorphous alloys

被引：0

作者：

Schumacher, P ^{[1
]}

Cizek, P ^{[1
]}

Bunn, AM ^{[1
]}

机构：

[1] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

LIGHT METALS 2000 | 2000年

关键词：

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The poisoning mechanism of Zr was investigated using a metallic glass technique. Grain refining particles from a 5:1 TIBAL rod were embedded into a metallic glass produced by melt-spinning an Al87Ni10Zr3 (at.%) alloy. Within the as-quenched samples, dendrites of alpha-Al were found on TiB2 particles and on primary dendrites of Al3Zr competing to nucleate alpha-Al. On boride particles a thin diminishing tri-aluminide layer was found to nucleate alpha-Al. Zr was found to preferentially diffuse into TiB2 particles rather than to form a thick layer of Al3Zr on these particles. The epitaxial relationship found between the tri-aluminide layer and the (Zr,Ti)B-2 particle is limited by the expanding lattice parameter of the boride with increasing Zr content. The nucleation mechanism on the boride particles and the influences of Zr are discussed with respect to conventional casting practice.

引用

页码：839 / 844

页数：6

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