Solidification Microstructure of （Al2O3+Al3Zr）p/A356 Composites Synthesized by Electromagnetic Stirring

Li Guirong Dai Qixun Zhao Yutao Wang Hongming

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Solidification Microstructure of （Al₂O₃+Al₃Zr）p/A356 Composites Synthesized by Electromagnetic Stirring
Issue 8, Pages: 502-504(2005)
Published： 2005 ，
DOI：

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[1]李桂荣,戴起勋,赵玉涛,王宏明.电磁搅拌法合成(Al_2O_3+Al_3Zr)p/A356复合材料的凝固组织[J].特种铸造及有色合金,2005(08):502-504+448.

Li Guirong Dai Qixun Zhao Yutao Wang Hongming. Solidification Microstructure of （Al₂O₃+Al₃Zr）p/A356 Composites Synthesized by Electromagnetic Stirring. [J]. Special Casting & Nonferrous Alloys (8):502-504(2005)
[1]李桂荣,戴起勋,赵玉涛,王宏明.电磁搅拌法合成(Al_2O_3+Al_3Zr)p/A356复合材料的凝固组织[J].特种铸造及有色合金,2005(08):502-504+448. DOI：

Li Guirong Dai Qixun Zhao Yutao Wang Hongming. Solidification Microstructure of （Al₂O₃+Al₃Zr）p/A356 Composites Synthesized by Electromagnetic Stirring. [J]. Special Casting & Nonferrous Alloys (8):502-504(2005) DOI：

摘要

在电磁搅拌作用下用A356-Zr（CO3）2组元通过熔体反应法原位合成了Al2O3、Al3Zr颗粒增强铝基复合材料

扫描电镜观察试样凝固组织发现:复合材料中内生增强颗粒粒度为1

μm

并随着搅拌强度的增加

增强颗粒在基体中的体积分数和弥散度显著提高

原因是电磁搅拌促进了传热和传质扩散

改善了原位合成动力学条件;同时Si相形貌由片状初晶硅向针状、细棒状共晶Si转变

随搅拌强度的增加硅相变质

这是电磁搅拌和内生颗粒共同作用的结果。

Abstract

(Al

+Al

Zr)p/A356 composites were synthesized by melt-reaction in A356-Zr（CO

） system with electromagnetic stirring.Observation of solidified microstructure by SEM show that the volume fraction and dispersity of reinforced particulate with the size of 1～3 μm in matrix can be improved with the stirring intensity increasing due to the electromagnetic stirring promoting heat transfer and solute diffusion to improve in-situ synthesized kinetics.Meanwhile

co-action of electromagnetic stirring and in-situ particulate results in the transformation of Si phase from sheet primary Si to needle-like or fine-rod eutectic Si.