Thermodynamics and Kinetics of In-situ Synthesized Mg<sub>2</sub>Si/AM60 Composites

Hu Yong; Yan Hong; Chen Guoxiang

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Thermodynamics and Kinetics of In-situ Synthesized Mg₂Si/AM60 Composites
Issue 3, Pages: 239-241(2008)
Published： 2008 ，
DOI：

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[1]胡勇,闫洪,陈国香.原位生成Mg_2Si/AM60复合材料的热力学与动力学分析[J].特种铸造及有色合金,2008(03):239-241+164.

Hu Yong, Yan Hong, Chen Guoxiang. Thermodynamics and Kinetics of In-situ Synthesized Mg₂Si/AM60 Composites. [J]. Special Casting & Nonferrous Alloys (3):239-241(2008)
[1]胡勇,闫洪,陈国香.原位生成Mg_2Si/AM60复合材料的热力学与动力学分析[J].特种铸造及有色合金,2008(03):239-241+164. DOI：

Hu Yong, Yan Hong, Chen Guoxiang. Thermodynamics and Kinetics of In-situ Synthesized Mg₂Si/AM60 Composites. [J]. Special Casting & Nonferrous Alloys (3):239-241(2008) DOI：

摘要

以Si作为反应添加物

原位生成了Mg2Si增强镁基复合材料。借助光学显微镜（OM）及X射线衍射分析（XRD）

发现复合材料组织由初生α-Mg、β-Mg17Al12相以及增强相Mg2Si组成。从热力学和动力学两方面

探讨了原位生成Mg2Si的机制

建立了体系原位生成Mg2Si的动力学模型。结果表明

影响反应速度的主要因素为体系温度、Si颗粒大小以及扩散中间层的厚度。

Abstract

The Mg2Si particulate reinforced Mg matrix composites was prepared by in-situ synthesized method with Si as reactive agent.The microstructure of the composites was observed by OM（optical microscope）

XRD（X-ray diffractionmeter）.It is found that microstructure of the composites is composed of α-Mg phase

β-Mg17Al12 phase and Mg2Si reinforcement.The mechanism of in-situ synthesized Mg2Si phase was expounded based on thermodynamics and kinetics

and the kinetic model was established.The results show that the reactive rate of in-situ synthesis is controlled by system temperature

Si particle size and the thickness of diffusion layer.